JP2018141154A - Highly smooth coating composition that can realize film of low surface roughness, application method and repair method therefor, and compressor surface-treated with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating composition capable of realizing a coating film having excellent surface smoothness and heat resistance. The coating composition of the present invention is a coating composition used for forming a top coat layer on the surface of a substrate, and the surface roughness of the substrate is Ra1 and the coating material is formed on the surface of the substrate. When the surface roughness of the coating film made of the composition is Ra2, Ra2 / Ra1 is 0.4 or less. [Selection diagram] Fig. 1

Description

  The present invention relates to a coating composition, a coating film using the same, a compressor, a construction method, and a repair method.

  So far, various studies have been made on coating compositions for forming a topcoat layer. As this type of technology, one described in Patent Document 1 is known. In this document, the surface roughness Ra is 0.5 μm or less by applying and baking a surface-treated gas turbine engine compressor blade with a scaly top coat containing aluminum having an average particle size of 5 μm or less. It is described that a film can be obtained (paragraph 0020 of Patent Document 1). Examples 1 to 9 of the same document show that Ra is 0.42 to 0.49 μm (Table 6 of Patent Document 1).

JP 7-144171 A

In recent years, the level of demand for reducing surface roughness has increased further.
As a result of the study by the inventor in view of such a development environment, it has not yet been found that the surface roughness Ra achieves a level of 0.4 or less in the coating material described in Document 1 above. It has been found that there is room for improvement in terms of smoothness and heat resistance.

  In the above document 1, it is described that it is extremely difficult to realize a coating film having a surface roughness Ra of 0.5 μm or less when a non-leafing type (non-flaky) is used. That is, the design of the coating film of Document 1 is intended to reduce the surface roughness of the coating film itself by laminating scaly aluminum in layers.

On the other hand, the present inventor considered to reduce the surface roughness of the topcoat layer by adopting a design that appropriately embeds the components in the coating film in the irregularities of the substrate as the base.
As a result of investigation by the present inventor based on such knowledge, the surface roughness of the substrate is Ra1, and the surface roughness of the coating film (topcoat layer) formed of the coating composition formed on the surface of the substrate is Ra2. When Ra2 / Ra1 is used as an index, it is found that the embedding condition of the paint component in the unevenness of the substrate surface can be stably evaluated in consideration of the surface shape of the substrate that is the base of the topcoat layer. It was.
As a result of intensive studies based on such an index Ra2 / Ra1, it is possible to improve heat resistance as well as surface smoothness in a topcoat layer made of such a coating composition by controlling Ra2 / Ra1 to be a predetermined value or less. The present inventors have found that this can be done and have completed the present invention.

According to the present invention,
A coating composition used to form a topcoat layer on the surface of a substrate,
When the surface roughness of the substrate is Ra1, and the surface roughness of the coating film made of the coating composition formed on the surface of the substrate is Ra2,
A coating composition having Ra2 / Ra1 of 0.4 or less is provided.

  Moreover, according to this invention, the coating film which consists of the said coating composition is provided.

  Moreover, according to this invention, a compressor provided with the said coating film is provided.

Also according to the invention,
A construction method for forming a topcoat layer on the surface of a substrate,
There is provided a construction method including a coating film forming step of forming a coating film made of the coating composition on the surface of the substrate.

Also according to the invention,
Cleaning the surface of the blades of the compressor of the gas turbine;
And a step of forming a coating film made of the coating composition as a topcoat layer on the surface of the blade.

  ADVANTAGE OF THE INVENTION According to this invention, the coating composition which can implement | achieve the coating film excellent in surface smoothness and heat resistance, the coating film using the same, a compressor, its construction method, and the repair method are provided.

It is a figure for demonstrating the coating film which consists of a coating composition of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

  The outline | summary of the coating composition of this embodiment is demonstrated.

  The coating composition of this embodiment is a coating composition used for forming a topcoat layer on the surface of a substrate. In such a coating composition, when the surface roughness of the substrate is Ra1, and the surface roughness of the coating film made of the coating composition formed on the surface of the substrate is Ra2, Ra2 / Ra1 is 0.4 or less. It can be.

  According to this embodiment, heat resistance can be improved with surface smoothness by making said Ra2 / Ra1 below an upper limit.

  Moreover, Ra2 can make the surface roughness of the coating film which consists of a coating composition of this embodiment into 0.40 micrometer or less, for example. Thereby, it becomes possible to realize very excellent surface smoothness.

  Moreover, the coating composition of this embodiment can be used for a compressor, for example, Specifically, it can be used for the topcoat layer formed in the surface of the braid | blade (rotary blade) for compressors. That is, the blade of the compressor can be provided with a coating film made of the coating composition of the present embodiment as a topcoat layer.

  In the present embodiment, the compressor is, for example, a machine that compresses and pumps liquid or gas with a blade, and includes a turbo compressor such as an axial flow compressor or a centrifugal compressor. Such compressors include aircraft gas turbines, marine gas turbines, generator gas turbines, air flow separators, dust collectors, vacuum pumps, wind tunnels, propane (natural gas) oxidative dehydrogenators, pipeline pumps, etc. It can be used for industrial applications.

  Among these, an example of the gas turbine includes a compressor, a combustor, and a turbine. The compressor flows the compressed air into the combustor. In the combustor, the incoming compressed air is mixed with fuel such as natural gas and ignited to form hot combustion gases. As the hot combustion gas flows backward and passes through the turbine, the blades are rotated and then the shaft is driven, thereby providing mechanical work.

According to this embodiment, since the top coat layer having a surface roughness Ra of 0.4 μm or less can be formed on the blade surface by applying the coating composition, the efficiency of the compressor can be improved. It becomes possible to improve the efficiency of a gas turbine provided with a simple compressor.
Further, according to the coating composition of the present embodiment, there is no need for a step of polishing the substrate surface before forming a coating film by an automatic polishing machine or manual polishing by a skilled worker, and even if this step is not performed, the surface smoothness is achieved. Since an excellent blade can be realized, the manufacturing cost of the blade can be reduced.
In addition, according to the coating composition of the present embodiment, since it is possible to perform on-site construction with the blades installed in the compressor, even during periodic blade overhaul, a spare rotor (a plurality of blades can be attached). (Rotor) becomes unnecessary.
In addition, by applying the coating composition of the present embodiment at the time of overhaul, a topcoat layer having a surface roughness Ra of 0.4 μm or less can be realized again on the surface of the blade. It becomes possible to maintain.
As described above, by using the coating composition of the present embodiment for a compressor, a significant cost reduction can be realized.

  Hereinafter, the component of the coating composition of this embodiment is demonstrated.

  The coating composition of this embodiment can contain a binder and a filler.

  The filler according to the present embodiment can include, for example, an inorganic filler. Examples of the inorganic filler may include one or more selected from the group consisting of alumina, silica, mica, cordierite, silicon nitride, zirconia, silicon carbide, and inorganic pigment. These may be used alone or in combination of two or more. Among these, alumina can be used from the viewpoint of heat resistance and smoothness.

  Examples of the shape of the filler include a spherical shape, a true spherical shape, a plate shape, and a granular shape. These may be used alone or in combination of two or more. Among these, spherical is preferable from the viewpoint of smoothness.

  The lower limit of the particle size of the filler is, for example, 0.02 μm or more, preferably 0.1 μm or more, and more preferably 0.2 μm or more. Moreover, as an upper limit of the particle size of the said filler, it is 5 micrometers or less, for example, 1.5 micrometers or less are preferable and 0.9 micrometers or less are more preferable. By setting it within such a numerical range, it becomes possible to improve the surface smoothness of the topcoat layer.

  In the present embodiment, the particle diameter of the filler can be a median diameter (average particle diameter D50).

  From the viewpoint of dispersibility, the filler may be used, for example, in a slurry state dispersed in a solvent. That is, the coating composition of this embodiment may contain a slurry-like substance (hereinafter referred to as slurry) in which a filler is dispersed in a solvent. That is, the coating composition can contain a solvent. The slurry may contain a dispersant.

  In the slurry, for example, the slurry concentration (the content ratio of the filler as a solid content) may be, for example, 1% by weight to 80% by weight, 5% by weight to 70% by weight, and 25% by weight to 60% by weight. % Or less may be sufficient.

  As said solvent, it is water or an organic solvent, for example, Preferably it is a hydrophilic organic solvent. These may be used alone or in combination of two or more. For example, two or more organic solvents having different boiling points may be used in combination.

  The solvent may include, for example, a high boiling point solvent having a boiling point of 100 ° C. or higher and 220 ° C. or lower. The upper limit of the boiling point of the high boiling point solvent is, for example, 220 ° C. or lower, and preferably 210 ° C. or lower. Thereby, it becomes possible to form a coating film by heating or drying at a low temperature. Therefore, in a structure provided with the coating film which consists of a coating composition of this embodiment, it can control that degradation by high heat arises. The lower limit of the boiling point of the high boiling point solvent may be, for example, 100 ° C. or higher, or 105 ° C. or higher. Thereby, in the storage environment, such as room temperature, since evaporation of a solvent can be suppressed, storage property can be improved. In addition, the reproducibility of the coating film characteristics can be improved.

  Examples of the high boiling point solvent include isobutanol (boiling point 108 ° C.), propargyl alcohol (boiling point 113.6 ° C.), n-butanol (boiling point 117.5 ° C.), propylene glycol monomethyl ether (boiling point 121 ° C.), acetic acid. Butyl (boiling point 127 ° C), ethyl cellosolve (boiling point 136 ° C), propyl cellosolve (boiling point 150 ° C), butyl cellosolve (boiling point 171.2 ° C), ethylene glycol monoacetate (boiling point 188 ° C), 2-ethoxyethyl acetate (boiling point 156) .8 ° C.), ethyl diglycol (boiling point 202.7 ° C.), and the like.

Meanwhile, the solvent may include a low boiling point solvent having a boiling point of 50 ° C. or higher and lower than 100 ° C.
Examples of the low boiling point solvent include low molecular weight alcohols such as methyl alcohol (64.7 ° C.), ethyl alcohol (78.37 ° C.), and isopropyl alcohol (boiling point 82.4 ° C.). This makes it possible to form a coating film in a lower temperature environment or a dry environment.

The binder can contain an organoalkoxysilane as the metal alkoxide.
This organoalkoxysilane becomes a polymerized organopolysiloxane by hydrolysis and polycondensation. In addition to organoalkoxysilane, metal alkoxides such as Ti, Al, and Zr may be used.

  Specific examples of the organoalkoxysilane include methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane, i-propyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3 3-trifluoropropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylto Ethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3,4-epoxycyclohexylethylmethoxysilane, 3,4-epoxycyclohexylethylethoxysilane, γ -Aminopropylmethoxysilane, (gamma) -aminopropylethoxysilane, etc. can be illustrated. These may be used alone or in combination of two or more. Among these, methyltrimethoxysilane or methyltriethoxysilane can be used. It is also possible to use a hydrolyzate obtained by previously hydrolyzing an organoalkoxysilane in the presence or absence of an acid or an alkali, or a partial condensate obtained by further aging the hydrolyzate and polycondensing it.

The binder may contain metal colloid or metal fine particles as metal particles.
A metal colloid (for example, colloidal alumina) is a metal oxide sol (alumina sol) having a pH of 2.5 to 6 using an inorganic oxide such as alumina as a carrier and water and / or a lower alcohol as a dispersion medium. be able to.
This metal oxide sol may contain, for example, 5 to 50% by weight, preferably 5 to 25% by weight in terms of solid content. The metal oxide sol may contain an acid such as nitric acid, hydrochloric acid, and acetic acid as a stabilizer.

On the other hand, the metal fine particles are, for example, fine particulate alumina, and alumina produced by a high temperature hydrolysis method of a purified aluminum salt can be used. As the fine particulate alumina, an acidic aqueous dispersion having a pH of 2 to 6 can be used.
Colloidal alumina (metal colloid) and fine particle alumina (metal fine particles) have, for example, an average particle diameter of 5 to 200 nm, preferably 5 to 100 nm, and more preferably 5 to 50 nm.

  Moreover, the binder of this embodiment can contain the said organoalkoxysilane, the said metal colloid or metal microparticles, and a hydrophilic organic solvent. Examples of such a binder include Ceramica G-92-6 manufactured by Nikken Co., Ltd., G-90 manufactured by Nikken Co., Ltd. and the like.

  Examples of the hydrophilic organic solvent include alcohols, glycols, esters, ethers, and ketones. Examples of alcohols include aliphatic alcohols having 1 to 8 carbon atoms such as methanol, ethanol, n-propanol, i-propanol, n-butanol, sec-butanol, t-butanol, n-pentanol, n-hexanol, 4 -Methyl-2-pentanol, 4-methyl-n-pentanol and the like. Examples of glycols include ethylene glycol and propylene glycol. Examples of the esters include esters of the above alcohols and glycols such as formic acid, acetic acid, propionic acid, specifically methyl formate, ethyl formate, butyl formate, methyl acetate, ethyl acetate, butyl acetate, ethyl propionate, etc. it can. Examples of the ethers include alkyl ethers of the alcohols and glycols, such as dimethyl ether, diethyl ether, dibutyl ether, methyl ethyl ether, ethyl butyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl. Examples include ether and propylene glycol monoethyl ether. Examples of ketones include acetone, diethyl ketone, methyl ethyl ketone, and acetophenone. These may be used alone or in combination of two or more. Among these, i-propanol, n-butanol, ethylene glycol monobutyl ether, methyl ethyl ketone, ethyl acetate and the like may be used.

Such binding agents, in the coating film, for example, be formed with the SiO ₂ component from organoalkoxysilane, and Al ₂ O ₃ component of from colloidal alumina and particulate alumina, in composed solids Can do.

  In the binder, the solid content is, for example, 10 to 50% by weight, preferably 20 to 40% by weight, in terms of solid content.

  Moreover, in the joint part of the present embodiment, the content of alumina can be, for example, 10 to 45% by weight, preferably 15 to 40% by weight, in terms of solid content, with respect to the entire solid.

In the coating composition of the present embodiment, the lower limit of the filler content is, for example, 100 parts of the solid content of the binder (for example, SiO ₂ component and Al ₂ O ₃ component). More than 100 parts, preferably 120 parts or more, more preferably 140 parts or more. On the other hand, the upper limit value of the filler content may be, for example, 300 parts or less or 200 parts or less with respect to 100 parts of the solid content of the binder.

  In the present embodiment, the solid content of the coating composition refers to the non-volatile content in the coating composition, and refers to the remainder excluding volatile components such as water and solvent. Moreover, in this embodiment, content with respect to the whole coating composition refers to content with respect to the whole solid content except the solvent of a coating composition, when a coating composition contains a solvent.

  The coating composition of this embodiment can contain other components other than the component mentioned above as needed.

  The manufacturing method of the coating composition of this embodiment can use a well-known method, Although it does not specifically limit, For example, a filler is mixed with a solvent and a slurry is prepared, The obtained slurry and binder are used. By mixing, a coating composition can be obtained. If necessary, a binder curing catalyst can be added to the coating composition. The timing to add may be arbitrary.

  In the present embodiment, from the viewpoint of extending the pot life of the binder, the binder and its curing catalyst can be stored in separate containers. Similarly, a coating composition containing a binder and a filler can be stored separately from a curing catalyst for the binder (for example, the stabilizer such as nitric acid). The coating composition added with a curing catalyst is preferably used immediately, but if stored in a cool and dark place, for example, within 1 week to 1 week, there is often no practical problem.

  Hereinafter, the construction method using the coating composition of this embodiment is demonstrated.

  The construction method of the present embodiment includes a coating film forming step of forming a coating film made of the coating composition on the surface of the substrate. By this construction method, a topcoat layer can be formed on the surface of the substrate.

  In the construction method, a known method can be used as a method for forming a coating film, and for example, spray coating can be used. That is, the coating film forming step can include, for example, a step of applying the coating composition to the substrate by spraying. As a result, it is possible to efficiently apply a large area to be coated. Further, it is possible to perform on-site construction with the blade surface being installed in the compressor. In addition, the film thickness of the coating film can be easily controlled.

  In spray coating, for example, a mist-like coating composition can be sprayed onto the surface of a substrate that is an object to be coated. The humidity of the booth that performs spray coating is, for example, 60% or less, preferably 55% or less, and more preferably 50% or less. Thus, the formation efficiency of a coating film can be improved by appropriately controlling the drying conditions.

  A drying process can further be performed with respect to the formed coating film. In this drying step, the drying process may be performed together with the heat treatment, or the heat treatment may be performed after the drying process. In the drying step, an air flow such as dry air, warm air, dry warm air, or the like may be brought into contact with the coating film. Thereby, while being able to raise drying efficiency, the whole coating film can be dried uniformly.

  Regarding the heat treatment, the drying step is performed at a temperature of, for example, 220 ° C. or less, preferably 100 ° C. to 200 ° C., more preferably 130 ° C. to 190 ° C., and even more preferably 150 ° C. to 180 ° C. A step of heating and drying the film may be included.

In the case of using a conventional paint, it is often necessary to heat at a high temperature of 300 ° C. or higher in order to form a film.
On the other hand, in the coating composition of this embodiment, it is possible to form a film by drying the solvent at a low temperature of 220 ° C. or lower by appropriately selecting the boiling point of the solvent. Therefore, it can suppress that the blade of a compressor deteriorates by high temperature heating.

Moreover, although the coating composition of this embodiment takes time compared with the case where it heats at low temperature, it can dry and form into a film also in normal temperature environment.
Conventionally, each blade disassembled from a rotor at the time of overhaul is transported from a compressor installation location to a heating chamber in another location, where a coating film is formed again.
On the other hand, in the coating composition of this embodiment, on-site construction becomes possible with respect to the blade of the state installed in the compressor. That is, the coating composition of the present embodiment can be applied to the blade at the place where the compressor is installed.

  By the above construction method, the coating film which consists of a coating composition can be formed as a topcoat layer on the surface of a board | substrate.

  Hereinafter, the characteristic of the coating composition of this embodiment is demonstrated.

FIG. 1 is a view for explaining a coating film made of the coating composition of the present embodiment.
In this embodiment, as shown in FIG. 1A, the surface roughness of the substrate 10 is Ra1, and the surface roughness of the coating film (topcoat layer 20) made of the coating composition formed on the surface of the substrate 10 is used. Is Ra2. Further, the maximum height of the substrate 10 is Rz1, and the maximum height of the coating film (top coat layer 20) made of the coating composition formed on the surface of the substrate 10 is Rz2.
As shown in FIG. 1B, a base layer 30 may be formed on the surface of the substrate 10 by surface treatment or the like.

  In the coating composition of this embodiment, the upper limit value of Ra2 / Ra1 is, for example, 0.40 or less, preferably 0.39 or less, more preferably 0.35 or less, and still more preferably 0.8. 30 or less. Thereby, surface smoothness and heat resistance can be improved. On the other hand, the lower limit value of Ra2 / Ra1 is not particularly limited, but may be, for example, 0.01 or more, 0.05 or more, or 0.1 or more.

  In the coating composition of the present embodiment, the upper limit value of the surface roughness Ra2 of the coating film (topcoat layer 20) is, for example, 0.40 μm or less, preferably 0.39 μm or less, more preferably It is 0.35 μm or less, more preferably 0.30 μm or less. Thereby, it is possible to realize excellent surface smoothness. On the other hand, the lower limit value of Ra2 is not particularly limited, but may be, for example, 0.01 μm or more, 0.05 μm or more, or 0.1 μm or more.

  In the coating composition of the present embodiment, the surface roughness Ra1 of the substrate 10 is not particularly limited, but may be, for example, 0.4 μm to 2.5 μm, 0.5 μm to 2 μm, or 0.6 μm to 1 It may be 5 μm. Even on the surface of the substrate 10 which is relatively roughened by the anticorrosion treatment or the blast treatment, excellent surface smoothness can be realized by using the coating composition of the present embodiment as the topcoat layer 20.

  In the coating composition of this embodiment, the upper limit of Rz2 / Rz1 is, for example, 0.5 or less, preferably 0.4 or less, and more preferably 0.3 or less. Thereby, surface smoothness and heat resistance can be improved. On the other hand, the lower limit value of Rz2 / Rz1 is not particularly limited, but may be, for example, 0.01 or more, 0.05 or more, or 0.1 or more.

  In the coating composition of this embodiment, the upper limit value of the maximum height Rz2 of the coating film (topcoat layer 20) is, for example, 3 μm or less, preferably 2.5 μm or less, more preferably 2 μm or less. More preferably, it is 0.30 μm or less. Thereby, it is possible to realize excellent surface smoothness. On the other hand, the lower limit value of Rz2 is not particularly limited, but may be, for example, 0.01 μm or more, 0.05 μm or more, or 0.1 μm or more.

  Moreover, in the coating composition of this embodiment, although the maximum height Rz1 of the board | substrate 10 is not specifically limited, For example, 1 micrometer-10 micrometers may be sufficient, and 3 micrometers-8 micrometers may be sufficient. Even on the surface of the substrate 10 which is relatively roughened by the anticorrosion treatment or the blast treatment, excellent surface smoothness can be realized by using the coating composition of the present embodiment as the topcoat layer 20.

Here, the measurement conditions of Ra and Rz will be described.
The arithmetic average roughness Ra and the 10-point average height Rz can be measured using a surface roughness meter.
The film thickness can be measured using a film thickness meter.
Ra2 and Rz2 apply the coating composition to a substrate (for example, spray coating) to obtain a coating film, and the coating film thus obtained is, for example, at 150 ° C. for 30 minutes. It can be obtained by measuring a coating film (top coat layer) formed by carrying out heat treatment (drying treatment). When measuring the coating film after the drying treatment, for example, a rectangular metal substrate is used as the substrate in a top view having a predetermined length and width.

  In addition, Ra3 and Rz3 are measured on the coating film (topcoat layer) after the above-mentioned coating film after the drying treatment is further subjected to a high-temperature and long-time heat treatment at 550 ° C. for 100 hours. Can be obtained. When measuring the coating film after heating at a high temperature for a long time, it is preferable to use a metal substrate having heat resistance such as a SUS plate as the substrate. According to the knowledge of the present inventor, by using a metal substrate having heat resistance, it is possible to suppress the influence on the coating film caused by the metal substrate subjected to heat treatment for a long time at a high temperature.

  In this embodiment, Ra3 / Ra1 in the coating film after heat treatment at 550 ° C. for 100 hours is, for example, 0.8 or less, preferably 0.50 or less, and more preferably 0.40 or less. Yes, more preferably 0.35 or less. Thereby, surface smoothness can be maintained even after high-temperature and long-time heat treatment. On the other hand, the lower limit value of Ra3 / Ra1 is not particularly limited, but may be, for example, 0.01 or more, 0.05 or more, or 0.1 or more.

  In this embodiment, Rz3 / Rz1 in the coating film after heat treatment at 550 ° C. for 100 hours is, for example, 0.9 or less, preferably 0.50 or less, more preferably 0.40 or less. Yes, more preferably 0.35 or less. Thereby, surface smoothness can be maintained even after high-temperature and long-time heat treatment. On the other hand, the lower limit value of Rz3 / Rz1 is not particularly limited, but may be, for example, 0.01 or more, 0.05 or more, or 0.1 or more.

In the present embodiment, for example, the above-mentioned Ra2 / Ra1, Ra2, Rz2 / Rz1 and Rz2 are controlled by appropriately selecting the type and amount of each component contained in the coating composition, the method for preparing the coating composition, and the like. Is possible. Among these, for example, adjusting the particle size of the filler within an appropriate range, selecting a spherical shape as the filler shape, selecting a filler material of the same type as the metal species in the binder, filler Increasing the content from the solid content in the binder (SiO ₂ component and Al ₂ O ₃ component), the degree of dispersion of the filler in the slurry, selecting an appropriate solvent, and the balance between these and the film thickness, It is mentioned as an element for making Ra2 / Ra1, Ra2, Rz2 / Rz1 and Rz2 into a desired numerical range. Moreover, Ra3 / Ra1 and Rz3 / Rz1 can be made into a desired numerical range by appropriately controlling Ra2 / Ra1 and Rz2 / Rz1.

As a result of examination by the present inventors, when the surface roughness of the substrate is Ra1 and the surface roughness of the coating film made of the coating composition formed on the surface of the substrate is Ra2, Ra2 / Ra1 is used as an index. The present inventors have found that it is possible to stably evaluate the embedding condition of the paint component in the unevenness of the substrate surface in consideration of the surface shape of the substrate that is the base of the topcoat layer.
Although the detailed mechanism is not clear, it is possible to fill the gaps between the fillers arranged efficiently on the unevenness of the substrate surface with amorphous parts (such as SiO ₂ component and Al ₂ O ₃ component) in the binder. Therefore, it is considered that the surface smoothness and the heat resistance can be improved in the coating film because the coating film densely formed can be obtained.

  The coating film made of the coating composition of the present embodiment may be a single layer or a multilayer in which layers formed with different formulations are laminated.

  Moreover, the film thickness of the coating film of this embodiment can be appropriately adjusted according to the purpose, but the upper limit is, for example, 50 μm or less, preferably 40 μm or less, more preferably 30 μm or less. More preferably, it is 20 μm or less. Even in the case of a thin layer, a top coat layer having excellent surface smoothness can be formed. On the other hand, the lower limit value of the film thickness of the coating film is not particularly limited, but may be, for example, 1 μm or more, or 2 μm or more.

For example, a metal substrate or a ceramic substrate is used as the substrate 10 of the present embodiment.
The constituent material of the substrate 10 is not particularly limited, and examples thereof include an Al-based material, an Fe-based material, a Ni-based material, a Co-based material, and a ceramic matrix composite material. These may be used alone or in combination of two or more.
Examples of the Al-based material include aluminum and an aluminum alloy.
As the Fe-based material, various steel materials and iron-based alloys can be used. For example, carbon steel, alloy steel, nickel chrome steel, nickel chrome molybdenum steel, chrome steel, chrome molybdenum steel, manganese steel, tool steel, Examples include stainless steel (SUS), heat resistant steel, nitrided steel, case-hardened steel.
For example, a Ni-based alloy can be used as the Ni-based material.
For example, a Co-based alloy can be used as the Co-based material.
When using superalloys such as the above-mentioned Ni-based alloys, Co-based alloys, Fe-based alloys, and other metal materials, these may contain one or more known additive elements.
Examples of the ceramic matrix composite include ceramic matrix composites such as SiC and Al ₂ O ₃ .

  In the present embodiment, an anticorrosion film or a blasted surface may be formed on the surface of the substrate 10. That is, the surface of the substrate 10 may be blasted. Moreover, as shown in FIG.1 (b), the anticorrosion process may be performed on the surface of the board | substrate 10, and the anticorrosion film | membrane (base layer 30) may be formed. Thus, even if it is the surface-treated board | substrate 10, surface smoothness can be improved by using the coating composition of this embodiment for the topcoat layer 20. FIG.

  In the present embodiment, the anticorrosion film may contain aluminum. This anticorrosion film may be made of a metal such as aluminum that is more easily oxidized than the metal material constituting the substrate 10. Specifically, the anticorrosion film may be composed of an Al sacrificial film formed of an Al sacrificial anticorrosion paint, for example. Thereby, the anticorrosion effect can be provided to the substrate 10. Examples of the aluminum used in the sacrificial anticorrosive paint made of Al include, for example, flaky aluminum or spherical aluminum powder. By using flake-shaped aluminum, the heat resistance can be further improved.

  In this embodiment, the adhesiveness of the board | substrate 10 and a coating film can be improved by performing a blast process to the board | substrate surface. As the blasting treatment, for example, grit blasting, garnet blasting, sand blasting, shot blasting, or the like can be used.

  Although the coating composition of this embodiment can be used for various uses, it can be used for a compressor as an example.

  The compressor of this embodiment can be provided with a coating film made of the coating composition, and thereby can be provided with a blade having a topcoat layer formed on the surface thereof. Since the surface smoothness of such a blade can be improved, the work efficiency of the compressor can be increased. Also, the work efficiency can be improved in a gas turbine including a compressor.

Conventionally, in a blade of a compressor in a gas turbine, sufficient smoothness cannot be obtained. Therefore, by polishing the substrate surface before forming a coating film by an automatic polishing machine or manual polishing by a skilled worker, In many cases, the smoothness was increased.
On the other hand, according to the present embodiment, a top coat layer having a high smoothness with a surface roughness Ra of 0.4 μm or less can be formed on the blade surface by applying the coating composition. That is, by performing a surface treatment with the coating composition of the present embodiment, a blade having excellent surface smoothness can be stably realized. For this reason, the process of polishing the substrate surface before forming the coating film by an automatic polishing machine or a manual polishing operation by a skilled worker becomes unnecessary, and the manufacturing cost of the blade can be reduced.

Conventionally, when the polishing process is performed manually or manually before forming the coating film, or when the compressor is overhauled regularly, the blades are removed from the compressor and each individual blade is handled. There was a need to do. If it does so, if it is a compressor of a gas turbine, since it is necessary to prepare the reserve rotor in which all the blades were incorporated, the power generation cost might become high.
On the other hand, in the construction method of the coating composition of this embodiment, for example, a simple spray method can be used. For this reason, although it may be applied to the blade removed from the compressor, it can also be applied to the blade in a state of being installed in the compressor. Since such on-site construction is possible, it is not necessary to prepare a spare rotor even when the blade is overhauled, so that it is possible to reduce power generation costs.

Moreover, it is also possible to use the coating composition of this embodiment for the purpose of repair.
The repair method of the present embodiment includes, for example, a step of cleaning the surface of a blade of a compressor such as a gas turbine, and a coating film made of the coating composition of the present embodiment is formed on the surface of the blade as a topcoat layer. And a step of performing. As a method of forming the coating film, the above-described construction method can be used.

In this way, the top coat layer can be removed from the blade surface by washing or the like, and a new top coat layer can be easily formed on the exposed blade surface. Moreover, the coating composition of this embodiment can be dried and formed into a film even in a room temperature environment. Therefore, in the repair method, it is possible to perform on-site construction on the blade in a state where it is installed in the compressor. That is, it is possible to work on the spot without moving the blade from the place where the compressor is installed.
As described above, by using the coating composition of the present embodiment for a compressor, a significant cost reduction can be realized.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail with reference to an Example, this invention is not limited to description of these Examples at all.

(Filler)
White slurry A: 50 parts by weight of filler (cordierite, average particle diameter D50: 1.7 μm, granular), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk, manufactured by BYK Chemie) -111) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry A (slurry concentration 50% by weight).
White slurry B: 50 parts by weight of filler (alumina, average particle diameter D50: 0.7 μm, spherical), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk-, manufactured by BYK Chemie) 111) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry B (slurry concentration 50% by weight).
White slurry C: 50 parts by weight of filler (mica, average particle size D50: 5 μm, plate-like), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and a dispersant (Disperbyk-111, manufactured by BYK Chemie) ) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry C (slurry concentration 50% by weight).
White slurry D: 25 parts by weight of filler (alumina, average particle size D50: 0.02 μm, true sphere), 73.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk, manufactured by BYK Chemie) -111) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry D (slurry concentration 25% by weight).
White slurry E: 50 parts by weight of filler (alumina, average particle diameter D50: 0.27 μm, spherical), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk-, manufactured by BYK Chemie) 111) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry E (slurry concentration 50% by weight).
White slurry F: 20 parts by weight of filler (alumina, random), 78.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and 1.5 parts by weight of a dispersant (Disperbyk-111 manufactured by Big Chemie) After mixing and dispersing with a ball mill, white slurry F (slurry concentration 20 wt%) was obtained.
White slurry G: 50 parts by weight of filler (alumina, average particle size D50: 0.03 μm, true sphere), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk, manufactured by BYK Chemie) -111) 1.5 parts by weight were mixed and dispersed with a ball mill to obtain white slurry G (slurry concentration 50% by weight).
Tea slurry: 50 parts by weight of filler (silicon nitride, average particle size D50: 0.7 μm, spherical), 48.5 parts by weight of propylene glycol monomethyl ether (PGM, boiling point 121 ° C.), and dispersant (Disperbyk-, manufactured by BYK Chemie) 111) 1.5 parts by weight were mixed and dispersed by a ball mill to obtain a tea slurry (slurry concentration 50% by weight).

(Binder)
Binder liquid 1: Nikken Co., Ltd., Ceramica G-92-6

(solvent)
Solvent 1: IPA (isopropyl alcohol, boiling point 82.4 ° C.)

(substrate)
Substrate 1: Steel plate with base layer (SPCC steel plate with aluminum sacrificial coating 30 μm thick surface-treated with Al flake sacrificial anticorrosive paint (main component: aluminum flake, anticorrosive), vertical x horizontal: 50 mm x 100 mm, 2 mm thick, (Ra1: 1.01 μm, Rz1: 6.58 μm)
Substrate 2: Aluminum plate (manufactured by Partec Co., Ltd., length x width: 70 mm x 150 mm, 1 mm thickness, A5052P, Ra1: 0.72 μm, Rz1: 5.24 μm)
Substrate 3: SUS plate blasted on the surface (manufactured by Nippon Yakin Kogyo Co., Ltd., length × width: 50 mm × 100 mm, 2 mm thickness, SUS304)

(Coating composition)
The coating compositions of each Example, Comparative Example, and each Reference Example were prepared as follows.

<Example 1>
As a binder, 60 g of binder liquid 1 (manufactured by Nikken Co., Ltd., Ceramica G-92-6: a two-liquid type binder liquid mainly composed of polysilicon alkoxide. When solidified to dryness, it becomes a solidified product of about 20% by weight, and the solidified product is glassy and contains about 20% by weight of alumina. As a filler, 40 g of white slurry B (slurry concentration 50% by weight, Filler content: 20 g) was added and mixed for about 1 minute to obtain a coating composition of Example 1.

<Example 2>
A coating composition of Example 2 was obtained in the same manner as in Example 1 except that white slurry E (slurry concentration 50% by weight) was used in place of the white slurry B of Example 1.

<Example 3>
A coating composition of Example 3 was obtained in the same manner as in Example 1 except that 20 g of white slurry B and 20 g of white slurry E were used in combination instead of 40 g of white slurry B of Example 1.

<Example 4>
A coating composition of Example 4 was obtained in the same manner as Example 1 except that 20 g of white slurry B and 20 g of solvent 1 were used in place of 40 g of white slurry B of Example 1.

<Example 5>
A coating composition of Example 5 was obtained in the same manner as Example 1 except that the binder liquid 1 was changed from 60 g to 50 g and the white slurry B was changed from 40 g to 50 g.

<Comparative Example 1>

  A coating composition of Comparative Example 1 was obtained in the same manner as in Example 1 except that white slurry F (slurry concentration 20% by weight) was used in place of the white slurry B of Example 1.

<Reference Examples 1-5>
In place of the white slurry B of Example 1, Reference Example 1: White slurry A (slurry concentration 50% by weight), Reference Example 2: White slurry C (slurry concentration 50% by weight), Reference Example 3: White slurry D, respectively (Slurry concentration 25% by weight), Reference Example 4: White slurry G (slurry concentration 50% by weight), Reference Example 5: Similar to Example 1 except that tea slurry (slurry concentration 50% by weight) was used. The coating compositions of Reference Examples 1 to 5 were obtained.

[Coating]
The coating compositions obtained in Examples 1 to 5, Comparative Example 1 and Reference Examples 1 to 5 were spray-coated on the substrate 1 and the substrate 2, respectively (the temperature in the coating booth was 20 ° C. and humidity) Was 55%) to obtain a coating film. The obtained coating film was subjected to a heat treatment (drying treatment) at 150 ° C. for 30 minutes to form a coating film (topcoat layer) on the surfaces of the substrate 1 and the substrate 2. The arithmetic average roughness Ra2, 10-point average height Rz2 and film thickness of the topcoat layer after the drying treatment were measured.

[Evaluation A]
The obtained top coat layer was evaluated as follows. The evaluation results are shown below.

  The arithmetic average roughness Ra and 10-point average height Rz of the topcoat layer and the substrate (before the formation of the topcoat layer) were measured using a stylus type surface roughness meter manufactured by JENOPTIK Industrial Metrology Germany. The evaluation results are shown below.

  The film thickness of the topcoat layer was measured using an electromagnetic film thickness meter manufactured by Helmut Fischer. The evaluation results are shown below.

  Example 1: In the topcoat layer on the substrate 1, Ra2: 0.29 μm, Rz2: 1.64 μm, Ra2 / Ra1: 0.29, Rz2 / Rz1: 0.25, film thickness: 9.89 μm, In the topcoat layer on the substrate 2, Ra2: 0.20 μm, Rz2: 1.06 μm, Ra2 / Ra1: 0.27, Rz2 / Rz1: 0.20, and film thickness: 9.22 μm.

  Example 2: In the topcoat layer on the substrate 1, Ra2: 0.31 μm, Rz2: 1.65 μm, Ra2 / Ra1: 0.31, Rz2 / Rz1: 0.25, film thickness: 11.17 μm, In the topcoat layer on the substrate 2, Ra2: 0.18 μm, Rz2: 1.31 μm, Ra2 / Ra1: 0.24, Rz2 / Rz1: 0.25, and film thickness: 10.52 μm.

  Example 3 In the topcoat layer on the substrate 1, Ra2: 0.26 μm, Rz2: 1.58 μm, Ra2 / Ra1: 0.26, Rz2 / Rz1: 0.24, film thickness: 10.82 μm, In the topcoat layer on the substrate 2, Ra2: 0.18 μm, Rz2: 1.03 μm, Ra2 / Ra1: 0.25, Rz2 / Rz1: 0.20, and film thickness: 17.44 μm.

  Example 4: In the topcoat layer on the substrate 1, Ra2: 0.40 μm, Rz2: 2.26 μm, Ra2 / Ra1: 0.39, Rz2 / Rz1: 0.34, film thickness: 6.50 μm, In the topcoat layer on the substrate 2, Ra2: 0.17 μm, Rz2: 1.10 μm, Ra2 / Ra1: 0.24, Rz2 / Rz1: 0.21, and film thickness: 4.09 μm.

  Example 5: In the topcoat layer on the substrate 1, Ra2: 0.36 μm, Rz2: 2.03 μm, Ra2 / Ra1: 0.36, Rz2 / Rz1: 0.31, film thickness: 7.33 μm, In the topcoat layer on the substrate 2, Ra2: 0.19 μm, Rz2: 1.18 μm, Ra2 / Ra1: 0.26, Rz2 / Rz1: 0.23, and film thickness: 9.09 μm.

  Comparative Example 1: The top coat layer on the substrate 1 and the top coat layer on the substrate 2 were cracked after the heat treatment. Ra2, Rz2 and film thickness could not be measured.

  Reference Example 1: In the topcoat layer on the substrate 1, Ra2: 0.51 μm, Rz2: 3.49 μm, Ra2 / Ra1: 0.51, Rz2 / Rz1: 0.53, film thickness: 11.53 μm, In the topcoat layer on the substrate 2, Ra2: 0.39 μm, Rz2: 2.66 μm, Ra2 / Ra1: 0.55, Rz2 / Rz1: 0.51, and film thickness: 11.53 μm.

  Reference Example 2: In the topcoat layer on the substrate 1, Ra2: 0.53 μm, Rz2: 4.15 μm, Ra2 / Ra1: 0.53, Rz2 / Rz1: 0.63, film thickness: 18.97 μm, In the topcoat layer on the substrate 2, Ra2: 0.44 μm, Rz2: 3.42 μm, Ra2 / Ra1: 0.61, Rz2 / Rz1: 0.65, and film thickness: 18.97 μm.

  Reference Example 3: In the topcoat layer on the substrate 1, Ra2: 0.59 μm, Rz2: 3.05 μm, Ra2 / Ra1: 0.59, Rz2 / Rz1: 0.46, film thickness: 14.97 μm, In the topcoat layer on the substrate 2, Ra2: 0.34 μm, Rz2: 1.75 μm, Ra2 / Ra1: 0.48, Rz2 / Rz1: 0.33, and film thickness: 14.97 μm.

  Reference Example 4: In the topcoat layer on the substrate 1, Ra2: 0.61 μm, Rz2: 4.03 μm, Ra2 / Ra1: 0.60, Rz2 / Rz1: 0.61, film thickness: 9.39 μm, In the topcoat layer on the substrate 2, Ra2: 0.33 μm, Rz2: 1.78 μm, Ra2 / Ra1: 0.46, Rz2 / Rz1: 0.34, and film thickness: 22.89 μm.

  Reference Example 5: In the topcoat layer on the substrate 1, Ra2: 0.49 μm, Rz2: 2.98 μm, Ra2 / Ra1: 0.48, Rz2 / Rz1: 0.45, film thickness: 18.20 μm, In the topcoat layer on the substrate 2, Ra2: 0.35 μm, Rz2: 2.37 μm, Ra2 / Ra1: 0.49, Rz2 / Rz1: 0.45, and film thickness: 18.20 μm.

About the coating film (topcoat layer) which consists of the coating composition of Examples 1-5, the surface smoothness which was excellent in any of the board | substrate 1 and the board | substrate 2 compared with the reference examples 1-5 was shown, and high temperature The coating film was not cracked even after heat treatment for a long time, and thus it was found to have excellent heat resistance. It has been found that the coating composition of such an example is suitable for a compressor application because the efficiency of the compressor can be increased. In addition, the coating films (top coat layers) of Examples 1 to 5 did not cause discoloration or unevenness.
On the other hand, the coating film (topcoat layer) made of the coating composition of Comparative Example 1 was found to have low heat resistance because coating film cracking occurred in both the substrate 1 and the substrate 2.

[Evaluation B: Heat resistance test]
The following coating compositions were prepared.
<Example 6>
In the same manner as in Example 2, the coating composition of Example 6 was obtained.
<Comparative Example 2>
A coating composition of Comparative Example 2 containing no filler was obtained in the same manner as in Example 2 except that white slurry E (slurry concentration 50% by weight) was not used.
<Comparative Example 3>
In the same manner as in Reference Example 2, a coating composition of Comparative Example 3 was obtained.

The coating composition obtained in Example 6 and Comparative Example 2 was spray coated on the substrate 3 (the temperature in the coating booth was 20 ° C. and the humidity was 55%) to obtain a coating film. The obtained coating film was subjected to a heat treatment (drying treatment) at 150 ° C. for 30 minutes to form a coating film (topcoat layer) on the surface of the substrate 3, and each sample for evaluation was produced. The arithmetic average roughness Ra1, the 10-point average height Rz1 of the surface of the substrate 3 before coating, the arithmetic average roughness Ra2, the 10-point average height Rz2 of the top coat layer after the drying treatment, and the film thickness were measured.
Note that the blasting of the substrate 3 of Example 6 and Comparative Example 2 was performed under the same conditions, and the blasting of the substrate 3 of Comparative Example 3 was performed under rougher conditions.
The measurement results are as follows.
Example 6: Ra1: 0.50 μm, Rz1: 3.63 μm, Ra2: 0.15 μm, Rz2: 0.91 μm, Ra2 / Ra1: 0.30, Rz2 / Rz1: 0.25, film thickness: 12. 84μm
Comparative Example 2: Ra1: 0.50 μm, Rz1: 3.63 μm, Ra2: 0.50 μm, Rz2: 2.41 μm, Ra2 / Ra1: 0.99, Rz2 / Rz1: 0.66, film thickness: 9. 82 μm
Comparative Example 3: Ra1: 0.71 μm, Rz1: 5.38 μm, Ra2: 0.53 μm, Rz2: 3.42 μm, Ra2 / Ra1: 0.74, Rz2 / Rz1: 0.64, film thickness: 18. 97 μm

Subsequently, the obtained sample for evaluation was placed in a high heat-resistant circulating furnace and heated at 550 ° C. for 100 hours (high-temperature, long-time heat treatment). The arithmetic average roughness Ra3 and 10-point average height Rz3 of the topcoat layer were measured for each of the evaluation samples after the high temperature and long time heat treatment.
The measurement results are as follows.
Example 6: Ra3: 0.16 μm, Rz3: 1.13 μm, Ra3 / Ra1: 0.32, Rz3 / Rz1: 0.31
Comparative Example 2: Ra3: 0.73 μm, Rz3: 4.69 μm, Ra3 / Ra1: 1.45, Rz3 / Rz1: 1.29
Comparative Example 3: Ra3: measurement not possible, Rz3: measurement not possible

About the coating film (topcoat layer) which consists of the coating composition of Example 6, the surface smoothness which was excellent also in the board | substrate 3, compared with the comparative examples 2 and 3, surface smoothness also after high temperature and long-time heat processing. It turned out that it is excellent in property. By using the coating composition of Example 6 for the coating film, the surface smoothness index represented by | Ra3 / Ra1-Ra2 / Ra1 | and | Rz3 / Rz1-Rz2 / Rz1 | in comparison with Comparative Examples 2 and 3 It was found that the degree of increase in the thickness of the top coat layer after the heat treatment for a long time was reduced.
In addition, the appearance of the coating film after heat treatment for a long time was observed. The results are as follows. In Example 6, the coating film had gloss, no cracks were observed, and good surface smoothness was exhibited. On the other hand, in Comparative Example 2, although no crack was observed in the coating film, it was not glossy and the surface smoothness was not sufficient. Further, in Comparative Example 3, Ra and Rz could not be measured because cracks and peeling occurred on the entire surface of the coating film.
From the above, it was found that the coating compositions of the examples are suitable for compressor applications because the efficiency of the compressor can be increased.

  As mentioned above, although this invention was concretely demonstrated based on embodiment and an Example, these are the illustrations of this invention, Various structures other than the above can also be employ | adopted.

10 Substrate 20 Topcoat layer 30 Base layer

Claims (19)

A coating composition used to form a topcoat layer on the surface of a substrate,
When the surface roughness of the substrate is Ra1, and the surface roughness of the coating film made of the coating composition formed on the surface of the substrate is Ra2,
The coating composition whose Ra2 / Ra1 is 0.4 or less. The coating composition according to claim 1,
The coating composition whose Ra2 is 0.40 μm or less. The coating composition according to claim 1 or 2,
When the maximum height of the substrate is Rz1, and the maximum height of the coating film made of the coating composition formed on the surface of the substrate is Rz2,
The coating composition whose Rz2 / Rz1 is 0.5 or less. The coating composition according to claim 3,
The coating composition wherein Rz2 is 3 μm or less. The coating composition according to any one of claims 1 to 4,
A coating composition comprising a binder and a filler. A coating composition according to any one of claims 1 to 5,
A coating composition further comprising a solvent having a boiling point of 220 ° C. or lower. The coating composition according to any one of claims 1 to 6,
A coating composition in which an anticorrosive film or a blasted surface is formed on the surface of the substrate. The coating composition according to claim 7,
The anticorrosive film is a coating composition containing aluminum. A coating composition according to any one of claims 1 to 8,
The said board | substrate is a coating composition containing a metal substrate. A coating composition according to any one of claims 1 to 9,
A coating composition used for a compressor.   The coating film which consists of a coating composition of any one of Claim 1 to 10. The coating film according to claim 11,
The coating film whose film thickness of the said coating film is 1 micrometer or more and 50 micrometers or less.   A compressor provided with the coating film of Claim 11 or 12. A construction method for forming a topcoat layer on the surface of a substrate,
The construction method including the coating-film formation process which forms the coating film which consists of a coating composition of any one of Claim 1 to 10 on the surface of the said board | substrate. The construction method according to claim 14,
The said coating-film formation process is a construction method including the process of apply | coating a coating composition to the said board | substrate by spraying. The construction method according to claim 14 or 15,
The construction method which further includes the process of heat-drying the said coating film at the temperature of 220 degrees C or less. The construction method according to any one of claims 14 to 16,
The construction method, wherein the substrate is a blade of a compressor. The construction method according to claim 17,
The construction method, wherein the compressor is a gas turbine. Cleaning the surface of the blades of the compressor of the gas turbine;
Forming a coating film comprising the coating composition according to any one of claims 1 to 10 as a topcoat layer on a surface of the blade.

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