CN117203379A - Surface treatment methods of aluminum materials - Google Patents
Surface treatment methods of aluminum materials Download PDFInfo
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Abstract
根据本发明的实施例的铝材料的表面处理方法包括：对铝材料进行脱脂的步骤；对经脱脂的铝材料进行蚀刻的步骤；将经蚀刻的铝材料浸入处于25℃至30℃的25wt％至35wt％硝酸溶液中60秒或更长时间的第一除灰步骤；将经第一除灰的铝材料浸入处于25℃至30℃的5wt％至15wt％硝酸溶液中30秒至60秒的第二除灰步骤；对经第二除灰的铝材料进行阳极氧化的步骤；对经阳极氧化的铝材料进行着色的步骤；以及对经着色的铝材料进行封孔的步骤。
The surface treatment method of the aluminum material according to the embodiment of the present invention includes: the step of degreasing the aluminum material; the step of etching the degreased aluminum material; and immersing the etched aluminum material in 25wt% at 25°C to 30°C. to a first ash removal step of 35wt% nitric acid solution for 60 seconds or longer; immersing the first ash-removed aluminum material in a 5wt% to 15wt% nitric acid solution at 25°C to 30°C for 30 seconds to 60 seconds The second dust removal step; the step of anodizing the second dust-removed aluminum material; the step of coloring the anodized aluminum material; and the step of sealing the colored aluminum material.
Description
Technical Field
The present disclosure relates to a surface treatment method of an aluminum material, and more particularly, to a method of treating a surface of an aluminum material to improve surface hardness and corrosion resistance of the aluminum material.
Background
It is difficult to obtain an excellent appearance and excellent surface properties of an aluminum material by electroplating and coating conventionally used to achieve the color of the aluminum material. In particular, electroplating capable of achieving a high-gloss metal surface has been used to manufacture general faucets, but has disadvantages in that colors are limited to metal intrinsic colors such as silver and black, and thus the obtained corrosion resistance is poor.
Although coating can achieve various colors and grain textures using metal particles, the hardness thus obtained is very low, even to an extent lower than that of human nails, and thus it is difficult to obtain long-term corrosion resistance.
For example, faucet products manufactured by coating aluminum raw materials may be scratched by porcelain bowls, glass, sponge, etc. when used. In the case where the coating surface is directly scratched, white rust may be formed as a result of direct exposure of the aluminum raw material.
In the case where the excellent appearance and excellent surface properties of the aluminum material cannot be obtained by the surface treatment of the aluminum material, customer dissatisfaction increases over several months to several years, resulting in problems of reduced reliability of the product and financial loss due to additional cost of after-sales service.
Disclosure of Invention
Technical problem to be solved
In order to overcome the problems described above, a method of treating the surface of an aluminum material to improve the surface hardness and corrosion resistance of the aluminum material is provided.
Technical proposal
According to one aspect of the present disclosure, a method of treating a surface of an aluminum material includes: degreasing an aluminum material; etching the degreased aluminum material; performing a first ash removal treatment by immersing the etched aluminum material in a 25wt% to 35wt% nitric acid solution at 25 ℃ to 30 ℃ for 60 seconds or more; performing a second ash removal treatment by immersing the first ash-removed aluminum material in a 5wt% to 15wt% nitric acid solution at 25 ℃ to 30 ℃ for 30 seconds to 60 seconds; anodizing the second ash-removed aluminum material; coloring the anodized aluminum material; and sealing the colored aluminum material.
In addition, the degreasing may include: the aluminum material is washed in a solution comprising a neutral degreasing agent and 3wt% sulfuric acid at 50 ℃ to 60 ℃.
In addition, the etching may include: the aluminum material is immersed in a 1wt% to 3wt% sodium hydroxide solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
In addition, the anodizing may include: the aluminum material is immersed in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes, and a voltage of 12V to 13V is applied to the aluminum material.
In addition, the oxide film formed after the anodic oxidation may have a thickness of 3 μm to 8 μm.
In addition, the sealing may include: the aluminum material is immersed in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
In addition, the method may further include performing the first drying at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes after performing the sealing.
In addition, the method may further include: coating; and performing a second drying at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes after the first drying.
According to another aspect of the present disclosure, a method of treating a surface of an aluminum material includes: degreasing an aluminum material; etching the degreased aluminum material; performing an ash removal treatment on the etched aluminum material; anodizing the ash-removed aluminum material by immersing the ash-removed aluminum material in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes and applying a voltage of 12V to 13V to the ash-removed aluminum material; coloring the anodized aluminum material; and sealing the colored aluminum material, wherein an oxide film formed after the anodic oxidation has a thickness of 3 μm to 8 μm.
In addition, the ash removal process may include: performing a first ash removal treatment by immersing the aluminum material in a 25wt% to 35wt% nitric acid solution for 60 seconds or more; and performing a second ash removal treatment by immersing the aluminum material in a 5wt% to 15wt% nitric acid solution for 30 seconds to 60 seconds.
In addition, the degreasing may include: the aluminum material is washed in a solution comprising a neutral degreasing agent and 3wt% sulfuric acid at 50 ℃ to 60 ℃.
In addition, the etching may include: the aluminum material is immersed in a 1wt% to 3wt% sodium hydroxide solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
In addition, the sealing may include: the aluminum material is immersed in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
In addition, the method may further include: performing a first drying at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes; coating; and performing a second drying at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes after the sealing.
According to another aspect of the present disclosure, a method of treating a surface of an aluminum material includes: degreasing an aluminum material; etching the degreased aluminum material; ash removal of the etched aluminum material; anodizing the ash-removed aluminum material; coloring the anodized aluminum material; and sealing the colored aluminum material by immersing the colored aluminum material in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
In addition, the ash removal process may include: performing a first ash removal treatment by immersing the aluminum material in a 25wt% to 35wt% nitric acid solution for 60 seconds or more; and performing a second ash removal treatment by immersing the aluminum material in a 5wt% to 15wt% nitric acid solution for 30 seconds to 60 seconds.
In addition, the anodizing may include: the aluminum material is immersed in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes, and a voltage of 12V to 13V is applied to the aluminum material.
In addition, the degreasing may include: the aluminum material is washed in a solution comprising a neutral degreasing agent and 3wt% sulfuric acid at 50 ℃ to 60 ℃.
In addition, the etching may include: the aluminum material is immersed in a 1wt% to 3wt% sodium hydroxide solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
In addition, the method may further include: performing a first drying at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes; coating; and performing a second drying at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes after the sealing.
Advantageous effects
According to the present disclosure, a method of treating the surface of an aluminum material, which improves the adhesion of a coating material and removes impurities in the aluminum material as much as possible when compared to a general coating method, may be provided. In addition, a method of treating the surface of an aluminum material to have excellent surface appearance and increased hardness and corrosion resistance can be provided.
However, effects that can be obtained by the surface treatment method of an aluminum material according to an embodiment of the present disclosure are not limited to the above-described effects, and any other effects not mentioned herein will be clearly understood by those skilled in the art to which the present disclosure pertains through the following description.
Drawings
Fig. 1 is a flowchart illustrating a conventional method of treating a surface of an aluminum material.
Fig. 2 is a cross-sectional view of an aluminum material after surface treatment according to a conventional method.
Fig. 3 is a schematic view illustrating an anodized film of an aluminum material after being anodized according to a conventional method.
Fig. 4 is a flowchart illustrating a method of treating a surface of an aluminum material according to an embodiment of the present disclosure.
Fig. 5 is a flowchart specifically illustrating S700 of fig. 1.
Fig. 6 is a photograph of the surface of a material after anodic oxidation and complete sealing (sealing) according to a conventional method.
Fig. 7 is a photograph of the surface of a material after partial pore sealing in accordance with an embodiment of the present disclosure.
Fig. 8 is a schematic view illustrating a state in which pores are opened by anodic oxidation and partial pore sealing according to an embodiment of the present disclosure.
Fig. 9 is a cross-sectional view of an aluminum material after surface treatment according to an embodiment of the present disclosure.
Fig. 10 is a cross-sectional view of an aluminum material after surface treatment according to an embodiment of the present disclosure.
Fig. 11 is a photograph showing the thickness of a coating film of a product after surface treatment according to an embodiment of the present disclosure.
Fig. 12 is a photograph of a product manufactured by conventional bake coating after salt spray test.
Fig. 13 is a photograph of a product manufactured by baking coating after surface treatment according to an embodiment of the present disclosure after salt spray testing.
Best mode for carrying out the invention
A method of treating a surface of an aluminum material according to an embodiment of the present disclosure includes: degreasing an aluminum material; etching the degreased aluminum material; performing a first ash removal treatment by immersing the etched aluminum material in a 25wt% to 35wt% nitric acid solution at 25 ℃ to 30 ℃ for 60 seconds or more; performing a second ash removal treatment by immersing the first ash-removed aluminum material in a 5wt% to 15wt% nitric acid solution at 25 ℃ to 30 ℃ for 30 seconds to 60 seconds; anodizing the second ash-removed aluminum material; coloring the anodized aluminum material; and sealing the colored aluminum material.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described. However, embodiments of the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.
As used herein, terms such as "comprising" or "having" are intended to indicate the existence of the features, steps, functions, components, or combination thereof disclosed in the specification, and are not intended to exclude the possibility that one or more other features, steps, functions, components, or combination thereof may be present or added.
Throughout the specification, it will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present therebetween.
Throughout the specification, the terms "first," "second," and the like are used to distinguish one element from another, and are not limited by these terms.
Meanwhile, unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure pertains. Accordingly, these terms should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. For example, singular forms are intended to include plural forms as well, unless the context clearly indicates otherwise.
The terms "about," "substantially," and the like, as used throughout the specification, refer to an allowable error of natural manufacturing and substance when such allowable error corresponds to or is similar to the value, and these values are for convenience in clearly understanding the present disclosure or preventing an unintentional infringer from illegally using the present disclosure.
The reference numerals used in the operation are used for descriptive convenience and are not intended to describe the order of the operations and the operations may be performed in a different order unless the order of the operations is explicitly described.
Hereinafter, the operation principle and embodiments of the present disclosure will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a conventional method of treating the surface of an aluminum material.
Referring to fig. 1, a conventional method of treating the surface of an aluminum material includes forming, processing, polishing (buffering), degreasing, shot-peening, degreasing, and coating the aluminum material.
Fig. 2 is a cross-sectional view of an aluminum material after surface treatment according to a conventional method.
Referring to fig. 2, a primer layer is formed on an aluminum material after conventional surface treatment. A color base coat layer is formed on the primer layer, and a clear coat layer is formed on the color paint layer.
Fig. 4 is a flowchart illustrating a method of treating a surface of an aluminum material according to an embodiment of the present disclosure.
Referring to fig. 4, a method of treating a surface of an aluminum material according to an embodiment of the present disclosure may include forming (S100) and processing (S200), polishing (S300), degreasing (S400), shot blasting (S500), ultrasonic cleaning (S600), anodic oxidation (S700), and coating (S800) the aluminum material. Hereinafter, each process will be described in detail.
S100 may be a process of forming an aluminum material by die casting (die casting), extrusion, forging, or the like. S200 may be to machine ribs and holes on the formed surface. The aluminum material formed and treated as described above may be subjected to polishing (S300) to remove bubbles generated by die casting or to improve surface gloss. Subsequently, by shot blasting (S400), grain texture may be applied to the surface and impurities such as bubbles and foreign substances may be removed. Then, the peened surface may be anodized (S700).
Fig. 5 is a flowchart specifically illustrating S700 of fig. 1.
Anodic oxidation (anodic) is an electrochemical process of forming a uniform and thick oxide film on the surface of a metal such as aluminum by immersing the metal in a liquid-phase electrolyte and then supplying current by using the metal as an anode and an auxiliary electrode as a cathode.
The anode refers to an electrode in which oxidation occurs and is opposite to a cathode in which reduction occurs. Oxidation refers to a phenomenon in which a metal element is chemically combined with oxygen. Therefore, the electrochemical growth of an oxide film by oxidation on a surface using a metal as an anode in a solution is called anodic oxidation, that is, anodic oxidation.
Most metals exist in nature as oxides. That is, the stable phase is an oxide, and the metal is not a stable phase in nature, but a metastable phase.
In order for a metal to exist stably as a metastable phase, a protective oxide film needs to be naturally formed on the surface of the metal. The reason why a highly reactive metal such as aluminum is stably used in the air is that a natural oxide film formed on the surface of the metal protects the metal.
In general, corrosion resistance of metals depends on density and chemical stability of natural oxide films formed on the surface of the metals. Anodic oxidation may be an electrochemical process in which the thickness of an oxide film on a surface is artificially increased to protect a metal in case of insufficient corrosion resistance due to a too thin natural oxide film.
Referring to fig. 5, S700 may include: degreasing the aluminum material (S710), etching the degreased aluminum material (S720), ash-removing the etched aluminum material (S730), anodizing the ash-removed aluminum material (S740), coloring the anodized aluminum material (S750), and sealing the colored aluminum material (S760).
S710 may be a degreasing process for cleaning the surface of the aluminum material and removing residual organic impurities. In an embodiment, degreasing may be included in a composition comprising a neutral degreasing agent and 3wt% sulfuric acid (H 2 SO 4 ) Is washed in the solution of (a).
S720 may be etching for removing inorganic impurities present on the surface of the aluminum material degreased in S710 or in the aluminum material. In an embodiment, etching may include immersing the aluminum material in a 1wt% to 3wt% sodium hydroxide (NaOH) solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
S730 may be an ash removal process for removing inorganic impurities remaining on the surface of the aluminum material etched in S720. In an embodiment, the ash removal process may be a dual ash removal process including a first ash removal process and a second ash removal process.
Although a single ash removal process is conventionally performed, inorganic impurities may remain on the surface through the single ash removal process. In particular, in the case of die-cast aluminum materials, the content of impurities is relatively high, and thus it may be difficult to completely remove inorganic impurities from the surface of the material by performing ash removal only once.
Impurities remaining on the surface of the material may inhibit the formation of voids during the subsequent anodic oxidation process, resulting in stains and uneven color, thereby causing problems of deteriorated surface quality. Furthermore, in the case where the formation of voids is suppressed during the anodic oxidation process, it is difficult to form anchors.
According to an embodiment of the present disclosure, after removing impurities from a surface by a first ash removal treatment and applying a swelling (sweeping) effect to residual impurities, the impurities swelled by the first ash removal treatment may be more easily removed by a second ash removal treatment. Therefore, suppression of void formation can be prevented during the subsequent anodic oxidation process, thereby obtaining excellent quality.
In this case, the reaction can be carried out at 25 to 35wt% nitric acid (HNO) 3 ) The first ash removal treatment is performed in solution for 60 seconds or more.
In the case where the concentration of the nitric acid solution is less than 25wt%, a problem of increasing the processing time may occur due to insufficient reaction with impurities on the surface, and dirt formed on the surface may not be effectively removed. In contrast, in the case where the concentration of the nitric acid solution exceeds 30wt%, not only the impurities but also the raw materials are damaged, resulting in the formation of pinholes and pits. Meanwhile, in the case where the treatment is performed for less than 60 seconds, impurities may not be sufficiently removed, and the swelling effect of residual impurities may be reduced.
In this regard, the aluminum material subjected to the first ash removal treatment may be prepared by immersing the aluminum material in 5 to 15wt% nitric acid (HNO) at 25 to 30 deg.c 3 ) The second ash removal treatment is performed in the solution for 30 seconds to 60 seconds.
In view of the fact that the effect of eliminating impurities may be saturated and the raw material may be damaged, the concentration of nitric acid during the second ash removal treatment may be from 5wt% to 15wt%, which is lower than that of the first ash removal treatment. Meanwhile, in the case where the time of the second ash removal treatment is less than 30 seconds, efficient collision between the raw material and the acid is difficult to sufficiently proceed, so that the reaction time is insufficient. In contrast, in the case where the time of the second ash removal treatment exceeds 60 seconds, the manufacturing cost increases, and the manufacturing competitiveness may decrease.
S740 may be an anodic oxidation process for obtaining physical properties by forming an anodic oxide film having a minimum thickness and an increased pore diameter as a coated underlayer.
Fig. 3 is a schematic view illustrating an anodized film of an aluminum material after being anodized according to a conventional method.
Referring to fig. 3, it was confirmed that conventionally, complete pore sealing was performed by hard anodic oxidation (hard anodic) to reduce the diameter of the pores as much as possible. In the case of a part manufactured by performing anodic oxidation as a final process, hard anodic oxidation is performed to prevent dye discoloration from penetrating into pores and to improve scratch resistance of the surface of the anodic oxide film. For example, conventionally, anodic oxidation is performed by lowering the temperature to 18 ℃ to 20 ℃ and increasing the voltage to 16V to 18V in order to reduce the diameter of the pores as much as possible.
However, unlike the prior art, the anodizing according to the embodiments of the present disclosure may be performed by soft anodizing (soft anodizing) capable of increasing the diameter of the pores so that the coating material may penetrate into the pores. In the anodic oxidation according to another embodiment of the present disclosure, pores having a diameter twice or more as large as that of the prior art may be formed by decreasing the temperature of the sulfuric acid solution and increasing the voltage applied thereto. That is, the adhesion of the coated layer can be further improved by increasing the diameter of the pores, and physical properties can be obtained by forming an anodized film having a minimum thickness and an increased pore diameter as a bottom layer of the coating.
Anodic oxidation according to another embodiment of the present disclosure may include a process of immersing in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes and applying a voltage of 12V to 13V.
In the case where the anodic oxidation is performed for less than 5 minutes, a sufficient number of pores cannot be obtained due to an insufficient pore formation time, and excellent corrosion resistance cannot be obtained due to the film being too thin as compared with conventional coating, and the anchoring effect of the coating material is also reduced.
In contrast, in the case where the anodic oxidation is performed for more than 9 minutes, although the environment is suitable for growing pores, the pores become deeper and narrower, causing difficulty in the penetrating condition of the coating material, resulting in reduced adhesion to the coating material which is an organic material.
As described above, by adjusting the temperature and concentration of the sulfuric acid solution, the applied voltage, and the anodic oxidation time, an oxide film thinner than that of the related art can be formed. According to the embodiments of the present disclosure, by controlling the thickness of the oxide film formed after the anodic oxidation to 3 μm to 8 μm, the anodic oxide film functions as a base layer of a coating layer protecting raw materials, and also prevents an increase in manufacturing cost.
The oxide film is formed of a porous layer having a plurality of pores, and S750 may be a process of coloring the porous layer with a coating material by a coloring method such as organic material coloring, inorganic material coloring, and electrolytic coloring.
Fig. 6 is a photograph of the surface of a material after anodic oxidation and complete pore sealing according to a conventional method.
In the case of using anodic oxidation as a product of the final process treatment according to the conventional method, the desired corrosion resistance is generally obtained by a complete pore sealing treatment at 90 ℃ or higher at 1 minute per 1 μm of immersed material. Referring to fig. 3 and 6, by completely sealing the pores, all the pores are closed so that the coating material cannot penetrate into the pores.
Therefore, it is necessary to leave some pores on the surface by a partial pore sealing process in which the concentration and temperature of the pore sealing agent are reduced and the immersion time is reduced so that the coating material permeates into the pores and the pores serve as an anchor for retaining the coating layer.
Fig. 7 is a photograph of the surface of a material after partial pore sealing in accordance with an embodiment of the present disclosure.
Fig. 8 is a schematic view illustrating a state in which pores are opened by anodic oxidation and partial pore sealing according to an embodiment of the present disclosure.
Referring to fig. 7 and 8, S760 may be a process of performing a partial pore sealing process by reducing the concentration and temperature of the pore sealing agent and reducing the immersion time so that the coating material permeates into the pores. In an embodiment, the sealing may be a process of immersing the aluminum material in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes. By the sealing treatment, a mixture containing alumina (Al 2 O 3 ) And a hole sealing layer of the particles.
After coloring as described above, the durability of the anodized film by the pore sealing treatment is affected by the adhesion between the material and the layer formed on the material, and the formed layer should have high adhesion to pass the reliability test required for the exterior material.
By performing a partial pore sealing treatment instead of complete pore sealing, the coating material can penetrate into the pores and partially fill on the surface of the aluminum raw material in the subsequent coating, so that the pores serve as anchors to increase the adhesion of the coating material, improve corrosion resistance, and achieve unique color and grain texture of the coating material.
After the sealing process (S760), a first drying process may be performed to dry the surface. In an embodiment, after the sealing, the first drying process may be performed at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes.
Referring back to fig. 4, S800 may be a coating process performed by various coating methods such as bake coating, electrodeposition coating, and powder coating after the anodic oxidation (S700).
After the coating (S800), a second drying process may be performed. In an embodiment, the second drying process may be performed at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes after the coating.
Fig. 9 is a cross-sectional view of an aluminum material after surface treatment according to an embodiment of the present disclosure.
Referring back to fig. 2, in the case of surface-treating an aluminum material according to a conventional method, a primer layer, a color paint layer, and a varnish layer are formed on an aluminum raw material.
Referring to fig. 9, in the case of surface-treating an aluminum material according to an embodiment of the present disclosure, an anodized film, a primer layer, a colored paint layer, and a varnish layer may be formed on an aluminum raw material. That is, by the surface treatment method according to the embodiment of the present disclosure, by forming an anodized film on an aluminum material before coating, an aluminum material having excellent corrosion resistance as well as high surface hardness can be obtained.
Fig. 10 is a cross-sectional view of an aluminum material after surface treatment according to an embodiment of the present disclosure.
Referring to fig. 10, a coating material may penetrate into the pores by increasing the pore diameter of the anodic oxide film and performing a partial pore sealing treatment on the anodic oxide film. In this regard, the anodized film may have a thickness of 5 μm to 10 μm, and an oxide film containing aluminum oxide (Al 2 O 3 ) Is arranged on the sealing layer. In addition, a primer layer, a color paint layer, and a varnish layer may be formed on the coating material.
Hereinafter, the present disclosure will be described in more detail with reference to the following examples and comparative examples. However, the following examples are presented merely to illustrate the disclosure, and the scope of the disclosure is not limited thereto.
Example
The product was prepared by baking coating, and after the anodic oxidation surface treatment, the product was prepared by baking coating. In this regard, the anodization was performed according to the sequence, procedure and conditions shown in table 1 below. Then, a pencil hardness test and a salt spray test were performed on the product obtained by baking coating and the product obtained by baking coating after performing the anodic oxidation surface treatment.
TABLE 1
< test of pencil hardness >
The pencil hardness test was performed under a load of 1kg and a speed of 50 mm/min. In table 2, pencil hardness test results (1H to 4H) of the product obtained by baking coating and the product obtained by baking coating after the anodic oxidation surface treatment are shown. In table 2 below, "OK" refers to a case where no scratch occurs on the surface, and "NG" refers to a case where a scratch occurs on the surface.
TABLE 2
Referring to table 2 above, it was confirmed that the product obtained by baking coating after the anodic oxidation surface treatment had a superior surface hardness compared to the product obtained by baking coating, because the pencil hardness of the product obtained by baking coating was tested as 2H, and the pencil hardness of the product obtained by baking coating after the anodic oxidation surface treatment was tested as 4H.
< salt spray test >
The salt spray test was performed by repeating 20 cycles each including spraying 5wt% sodium chloride (NaCl) for 8 hours and standing at a temperature of 35 ℃ for 16 hours.
Fig. 12 is a photograph of a product manufactured by conventional bake coating after salt spray test.
Referring to fig. 12, it was confirmed that white rust was formed on the raw material of the product manufactured by the conventional bake coating after 5 cycles.
Fig. 13 is a photograph of a product manufactured by baking coating after surface treatment according to an embodiment of the present disclosure after salt spray testing.
Referring to fig. 13, white rust was not formed on the surface of the product surface-treated by anodic oxidation before bake coating even after 20 cycles.
According to the disclosed embodiments, it was confirmed that the product obtained by baking coating after the anodic oxidation surface treatment according to the present disclosure has superior surface hardness and corrosion resistance compared to the surface hardness and corrosion resistance of the product obtained by baking coating alone. Accordingly, in the aluminum material to which the surface treatment method according to the embodiment of the present disclosure is applied, surface defects occurring while being used can be suppressed, and delamination of the coating layer can be prevented. In addition, since corrosion resistance even in a corrosive environment is improved, the aluminum material can be applied to faucet products and the like.
Although one or more exemplary embodiments have been described with reference to examples, the present disclosure is not limited to the embodiments described above, and it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.
Industrial applicability
According to the present disclosure, compared to a general coating method, a method of treating the surface of an aluminum material to improve the adhesion of a coating material and remove impurities contained in the aluminum material as much as possible may be provided. In addition, a method of treating the surface of an aluminum material to improve hardness and corrosion resistance and to obtain an excellent surface appearance can be provided.
Claims (15)
1. A method of treating a surface of an aluminum material, the method comprising:
degreasing an aluminum material;
etching the degreased aluminum material;
performing a first ash removal treatment by immersing the etched aluminum material in a 25wt% to 35wt% nitric acid solution at 25 ℃ to 30 ℃ for 60 seconds or more;
performing a second ash removal treatment by immersing the first ash-removed aluminum material in a 5wt% to 15wt% nitric acid solution at 25 ℃ to 30 ℃ for 30 seconds to 60 seconds;
anodizing the second ash-removed aluminum material;
coloring the anodized aluminum material; and
sealing the holes of the colored aluminum material.
2. The method of claim 1, wherein the degreasing comprises: the aluminum material is washed in a solution comprising a neutral degreasing agent and 3wt% sulfuric acid at 50 ℃ to 60 ℃.
3. The method of claim 1, wherein the etching comprises: the aluminum material is immersed in a 1wt% to 3wt% sodium hydroxide solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
4. The method of claim 1, wherein the anodizing comprises: the aluminum material is immersed in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes, and a voltage of 12V to 13V is applied to the aluminum material.
5. The method according to claim 1, wherein an oxide film formed after the anodic oxidation has a thickness of 3 μm to 8 μm.
6. The method of claim 1, wherein the sealing comprises: the aluminum material is immersed in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
7. The method of claim 1, further comprising: the first drying is performed at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes after the sealing.
8. The method of claim 7, further comprising: coating; and performing a second drying at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes after the first drying.
9. A method of treating a surface of an aluminum material, the method comprising:
degreasing an aluminum material;
etching the degreased aluminum material;
performing an ash removal process on the etched aluminum material;
anodizing the ash-removed aluminum material by immersing the ash-removed aluminum material in a 23wt% to 24wt% sulfuric acid solution at 24 ℃ to 26 ℃ for 5 minutes to 9 minutes and applying a voltage of 12V to 13V to the ash-removed aluminum material;
coloring the anodized aluminum material; and
sealing the holes of the colored aluminum material,
wherein the oxide film formed after the anodic oxidation has a thickness of 3 μm to 8 μm.
10. The method of claim 9, wherein the ash removal process comprises:
performing a first ash removal treatment by immersing the aluminum material in a 25wt% to 35wt% nitric acid solution for 60 seconds or more; and
the second ash removal treatment is performed by immersing the aluminum material in a 5wt% to 15wt% nitric acid solution for 30 seconds to 60 seconds.
11. The method of claim 9, wherein the degreasing comprises: the aluminum material is washed in a solution comprising a neutral degreasing agent and 3wt% sulfuric acid at 50 ℃ to 60 ℃.
12. The method of claim 9, wherein the etching comprises: the aluminum material is immersed in a 1wt% to 3wt% sodium hydroxide solution at 50 ℃ to 60 ℃ for 10 seconds to 20 seconds.
13. The method of claim 9, wherein the sealing comprises: the aluminum material is immersed in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
14. The method of claim 9, further comprising:
performing a first drying at 60 ℃ to 70 ℃ for 10 minutes to 20 minutes;
coating; and
after the sealing, a second drying is performed at 145 ℃ to 150 ℃ for 30 minutes to 60 minutes.
15. A method of treating a surface of an aluminum material, the method comprising:
degreasing an aluminum material;
etching the degreased aluminum material;
ash removal of the etched aluminum material;
anodizing the ash-removed aluminum material;
coloring the anodized aluminum material; and
the colored aluminum material is sealed by immersing the colored aluminum material in a 3wt% to 5wt% nickel acetate solution at 70 ℃ to 80 ℃ for 2 minutes to 4 minutes.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2021-0071889 | 2021-06-03 | ||
| KR10-2021-0121894 | 2021-09-13 | ||
| KR1020210121894A KR20220163831A (en) | 2021-06-03 | 2021-09-13 | Surface treatment method of aluminum material |
| PCT/KR2022/006746 WO2022255681A1 (en) | 2021-06-03 | 2022-05-11 | Surface treatment method of aluminum material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117203379A true CN117203379A (en) | 2023-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280030323.8A Pending CN117203379A (en) | 2021-06-03 | 2022-05-11 | Surface treatment methods of aluminum materials |
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| Country | Link |
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| CN (1) | CN117203379A (en) |
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2022
- 2022-05-11 CN CN202280030323.8A patent/CN117203379A/en active Pending
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