DE1521645A1 - Process for applying a glass coating to the inner surface of a tubular object - Google Patents

Description

HAMBURGl, ά · ΙΪ 2θ. Dec

BAUlNDAMM 26 DR. E. WIEGAND TELEPHONE: 330475

MONKS
DIPL.-ING. W. NIEMANN

HAMBURG A EO A Pi AC

FATENTANWÄLTE ' ° ^ * ° ^ °

12 / H

A. 0. Snith Corporation, Milwaukee "Wlsoonsin (Y.St.A.)

Procedure for «applying an Olae coating to the Inner surface of a tubular object ·.

The invention relates to a corrosion-resistant tubular object and to a process iua application an OlasUbersuges on his InnaoflMch ·. in particular The aim of the invention is to provide a fault-free, corrosion-resistant oil lining in the metal pipe manufactured according to a legally competitive process is.

With the usual application of flash coatings on metal surfaces the surface of the workpiece is thoroughly cleaned xunMohst, usually by means of a sandblasting blower he follows. A glass-like bang is then sprayed onto the surface as an orundum coating, which acts as a surface covering acts and a isohe bond with dea Metal forms. Pie surface is dried, and the coated The workpiece is placed in an oven, which

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da «dried glass-like Eiaail on its transformation or Melting temperature is heated, causing it to uie metal surface is bound. The workpiece is then cooled down. A nasal covering eye is then placed on the surface of the door and over-eye applied by glazed enamel and the toerketüo * xuiu heating put back in the oven. The werkatUok will then cooled a second time and there will be another series applied by wet deck overlays, which overlay and repeating the heating in the manner described above.

This method of coating with glass is general Satisfactory for accessible surfaces, easy for conventional dlab applicators can be achieved, although it is uneconomical because of the high number of application and hot stages. In the invention is only a single heating of both the orund coating as well as a single final coating is required. How btl the commonly used procedure is applied to the Metallwerkstück «applied in wet orundum coating, which then is heated. Then the top coat is applied to the orundum coat while the work piece is at approximately the heating temperature of the base coat. It 1st it has been found that by applying a single deodorant coating a after this process a smooth corrosion-proof Surface can be obtained. By doing this geoKU of the invention re-heating and application

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If additional deck covers are switched off, the costs will be increased largely reduced, even if the coatings are on slightly accessible surfaces.

? .ura cover the inner surfaces of pipe-for- ming objects special application devices have been developed. These have frit feed lines, feed elements and jet nozzles. So far it was assumed that there was none these applicators provide a fry powder for a top coat in a satisfactory way on a round of keel- " no diameter or of moderate length can, .-. oak3 with a glass-like enamel Grundüborzuss has been recognized because the devices strive to have the soft surface of the glaa-like To touch Ernail ^ round cover and grind along it, thereby damaging the coated surface. This gives & I due to the difficulty of having the device so support and in alignment to apply the coating to avoid contact with the soft surface of the base.

To avoid damage to the surface of the base coat a glass-like porcelain enamel coating is to be prevented has been developed that converts to a relatively hard one in the first stages of heating (matures) and non-sticky surface at the UuN - temperature (Maturing temperature before the application of a deodorant cover glass to create, if this particular QrundUberzu ^

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is used, a damage dta OrundUberxug · » completely avoided, and it is not a special facility to set up the application device «rfordtrlioh, Since the basic coating changes in an early heat phase and then get in a relatively hard, non-sticky one State is located and in this state during the transformation temperature and lower temperatures remains, the frit applicator will damage the Surface of the base coat not. The device for Applying the deodorant coating can therefore be in constant contact with the inner surface of the tube inserted and operated to substantially form an aias coating composition To be applied over the entire length of the pipe, and it can then be withdrawn from the pipe without that there is a risk of damage to the surface of the Orund coating exists, whereby a corrosion-resistant metal pipe is created, which one with a defect-free Olas coating provided inner surface «.

The invention is illustrated below with reference to the drawing, for example.

Flg. 1 is a block diagram showing the sequential Steps veraneohaulicht, through dl a metal object with an aiassic rating of the invention is provided. Fig. 2 is a length without a length of pipe

at the «Ines furnace station, where the application

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The top coat takes place, and it shows a device for applying an acrylic composition which is arranged in a position in which it can apply the glass composition to the inner surface of the pipe provided with a base coat. Fig. } Is a transverse view of the pipe

Line> 5 of FIG. 2,

The method of the invention _t as illustrated in the block diagram of Fig. 1, 1st is to beatimrat to produce a corrosion-resistant tube, which has a glass-lined inner surface. The inner surface of the tube is initially treated to remove deposits or the like that result from the manufacture of the tube and from atmospheric oxidation of the metal. This surface treatment is usually by means of a sandblasting blower or the like. using conventional abrasive cleaning equipment. (

Subsequent to the cleaning treatment of the inner surface of the pipe is an aliasing powder (forming a glass-like enamel), which can be dispersed in water, either sprayed wet on the cleaned inner surface or as them Coating fluid applied by applying an aqueous “Prittedlsperslon is allowed to flow through the ear. This wet orundoberxug is then dried, and the pipe is Arranged in an oven to dine undUberxug sur production

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• To heat a »glass-like enamel primer coat. The heating temperature of the base coat was generally in the range of approximately 815 ° to 9 ° C. By adding heat-resistant material to the base coat frit powder, the converted glass-like enamel surface produced in this way was placed in a hard, non-sticky surface State, although the ear is kept at temperatures that are in the conversion range. The OrundUberzug is on

w Rotirinnenfläche chemically bound and acts as Abdlcht-Uberzui "a aiaadecküberzug can easily be chemically bound to do. It is also possible to incorporate the initial orundate coating into grain ";" to apply dry powder powder to the inner surface of the hoire. Hei such an operation the dry deadlines is adhered to the Metalifl ^r cozy by the tube is heated, while being rotated,

The pipe is generally inclined in the furnace Rails or supported on rollers so that it can be used during the Heating the ground suction towards the station can be moved to which the deodorant coating is applied will. That pipe is taken out of the furnace without it is and without its temperature is noticeably lowered, on the drive rollers at the station for application the cover overfeed »transferred, the rollers turn the tube, while the top coating (3 was applied to the inner surface dta pipe is applied and usually during the conversion dtr glass decomposition.

909838/0528 ^ßAo OR / _{G <NAt}

The cover-aiaazuaanimeneetz that a glaaertiges Enamel-forming freezing powder let, is adttele a tubular applicator to the inner surface of the tube upset. The application device extends over the entire length of the pipe and is carried through the inner surface of the pipe supported. The fry powder is in dtm rotating pipe through a · in the tubular applicator intended snail put down «The snail gives that; Fry powder from the end of the applicator, as it is gradually withdrawn from the rotating tube. As there. Fry powder evenly over the geaaste Inner surface of the tube is distributed and a temperature reached, which is close to the temperature of the basic coating or below, keep it on the surface of the cover and is chemically fused with it.

In some cases, if the pipe is a proportionate large length and small diameter, uses two devices for introducing fry powder from those dl · «in · in the · 1η · End · dec pipe and dl · in · in the opposite end of the tube is inserted. In other Cases a DUa containing crittepowder is used, which is rotated by 180 °, u * daa fry powder over dl g «aaat« LKng · dea pipe · «to be deposited. Ebtneo can create powder decomposition devices be used to simulate a · Dedcliberxug-Qlaaxuaftmaenattxung on the · inner surface of the pipe »Ufiubringtn. Since the «uvor upset« arundUjert »,« * in

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becomes hard and non-sticky the first time it is exposed, can use the device used to apply the final coating the inner fliohe on the whole lung of the tube without touching the surface of the base coat that has just been formed to damage.

In some cases, In pipe lengths are from about 6 to 9 in or more and also in shorter pipe lengths of proportionally

. Unsupported Aufbrlngvorrlohtungen never small Durohmesser has been introduced. Such applicators necessarily have considerable slack, even when they are clamped. The outer end of the applicator therefore has an effort to match the previously applied Get in touch with experience below. However resist the relatively hard, non-sticky orundum coating effective according to the invention of a surface covering that would otherwise be caused by such a bearing contact would be evoked.

) After the flow application device after completion

of applying the deodorant coating to the rotating The tube is pulled out "the tube is turned continuously" until the powder is smooth over the entire surface distributed 1st and until then powder to the surface of the OrundUbersuges melted and converted 1st to one Create a corrosion-resistant deodorant coating from glass-like enamel. The tube is then taken out of the oven and 1st ready for use after cooling.

BATH

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In FIGS. 2 and 5, a simple device for applying a cover coating / accessory to the inner surface of a tube 1 is shown. The tube 1 shows how it is heated in a gas-filled oven 2 , although another suitable healing method, such as induction or resistance heating, can also be used. The tube 1 is supported on a series of parallel rollers 3 which are rotated over shafts * which are connected to a drive device (not shown). By driving the rollers at a predetermined speed, the tube 1 can be rotated during the application of the deodorant composition and during the conversion of the top coating. Such a rotation ensures an even distribution of the deodorant coating material, so that a continuously smooth one , results in an uninterrupted surface, and the rotation keeps the heated tube in a relatively straight state during the heating process.

The inner surface of the tube 1 becomes old with a rapidly transforming round-overcug-oleic composition 5 geaäi lined the invention. This plating let over the roped inner surface of the pipe 1 distributed and oheaisoh bound to them. The coating or lining 5 is used as a carrier for the chemical bond of a defect-free, corrosion-resistant glass-like enamel coating a.

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-loin dom tube 1 is a simple tube-shaped application device 6 arranged for distributing t'rittepowder, The applicator opens at one end the Roiir 1 and at the other and "in a funnel 7. Dor Hopper 7 contains a lot of top coat powder 8. From üöbi Xrionter / extends aioh a äcnneoko 9 up to deta Uu je red & nae of the application device and the sunshine 9 * is driven by a mother 1a.

While the tube 1 is being rotated by the rollers j , the tubular fitting device 6 is inserted into the tube with the help of EinIlUu-- and Huok'learullen 11, so that it can be placed on the rotating cone. The worm 9, which is driven with a pre-actuated gusset, releases riding powder from the application device 6 onto the inner surface of the tube 1 when the device 6 is pulled up all the way up to the tube 1. Di · dee rotation llohrei »1» irkt to the effect "d * to distribute a deposited by the device 6 irittepulver 8 det over the entire surface arundUberzuge * ^ gleiohlörmig. When the deodorant is not changed, a smooth "not interrupted", corrosion "constantly", glass-like, "all-over-the-air" is created.

«Iütfond oino type dor applicator device shown 1st "can" without the rahaon of the invention to vorlasson "auoh any other ring device has been used that is suitable to be inserted into a pipe in order to obtain a

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^ß AD ORIG'NAL

Glass coating composition along the entire length of the pipe that has been previously coated with a hard, non-sticky base coat composition.

One of the essential advantages of the invention can be seen from FIGS. 2 and $. Ee a simple, non-cantilevered applicator 6, which is fully supported on the inner coated surface of the pipe, can be used to apply the top coat / glass composition 3 to the pipe surface, even if this device 6 is in considerable contact with the straight with an orund coating provided area. The applicator 6 is therefore in considerable frictional contact with the surface of the local coating 5 of the tube 1 during the synchronization and during the withdrawal of the applicator 6 when pritte powder 8 is dispensed from it onto the inner surface of the rotating tube.

The early transforming, hard and non-sticky ( base coat geoäfl of the invention is highly resistant to surface damage that could result from the strong frictional contact of an application device with a coated surface. This eliminates technical problems when designing the application device, and Furthermore, the use of a simplified version of the application device in atarkken HaSe is made possible, avoiding the need for complex alignment

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. au «u collar. Every one of these characteristics leads to a beträohUlohtn Koet "n" r "parnieitn b" i άτ Htrettllun ".

Dlarundübersut-aiaituewneenettsune g «aäfl dtr Sr * finding requires * u »Itilioh su the usual ingredients dl · addition · a · g * »Ahlenen hitiebetttndigen material In an amount of about 25 bit 75 oew.jt. There · »ugeaetäte Ground coagulant material can be found in the following listed materials or a combination of these materials

Oxide of Boride of Mltrld from AXualnluB Hafnlua hafnium Silloiue Tantalum Tantalum CaloiuH Zircon boron Magnealu " niobium Zircon tin titanium titanium titanium Vanadlua uranium Zircon wolfran Thorlua Hafnlua Chroe AluMlnlUM 2er molybdenum BarluM beryllium BeryllIu * atrontlua niobium Tellurium BllloluB Lanthanum Chroe cobalt manganese molybdenum nickel niobium

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Slllild of

Tantalum

niobium

tungsten

hafnium

zirconium

Vanadium

titanium

molybdenum

chrome

Mlekftl molybdto

Chroa

Feldspar Wlsautstannate

Alkaline aluminum sillkate

Lithium aluminum * Silicates

Sodium antiaonate

Fluoride Flulspat

OxYd ₁ γοη ^ Thorium vanadium zinc

Chrome copper

Dlato earths Oadollnlua

Holmium Samarium Barium Tungsten Erbium Europium Oalllum Oermanium Tantalum Thallium Praseodymium Neodymium

The OMn listed bed-length materials aind caused by a ice cream temperature of 8? o ° C or higher * know. The addition of hit * · resistant material see below the basic Orundüberiugamaterial causes that not only the upper lung temperature of the Orundltbersuges is illuminated, but also the homogeneous NasM a decaying smKtlg higher Orad of initial rigidity is bestowed when the MMM is applied to a tube and dried 1st, is the resulting foot is reasonably liable if the dried upper suction to a temperature within minutes

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-H-

is erhltst wandlungsberelches (from about 843 ° to about 900 ⁰ C) "converts the check OrundUbersug In the Helssyklua vw frühseltig and erseugt ·« nloht-klebrlge abrasion resistant surface · tin · hard at temperatures in the Uawandlungsbereioh and below.

Its typical basic organic and superfluous composition geoOtd of the invention is, for example, the following 1

high quality materials 35 to 55 %

Brdalkallaetalloxyde 1 to 1o % Alkaline metal oxides 1o to 25 % Alkali metal halides 1 to 1% Oxides of copper, chromium, cobalt, Manganese and Nickel 0.5 to 5 % Boron oxides 12 to 24 % This basic general and supervisory plan will be a

ground retaining material, or a combination of ground retaining material, is added in an amount in the range of about 25 to 75% in order to obtain the organic content according to the invention.
) Am · OrundUDer * uge »u» ajmeeneetxung, with what good

Results could be obtained «contains the following components ι

909838/0526 ^BAD original

SiO ₂ 38 - 42 * TiO ₂ 0 - 3 Ji Al ₂ O ₃ 2 - 5 Ji B ₂ O. 16 - 2ο % CaO 2 - 6 % Na ₂ O 15 - 19 Ji K ₂ O 0 - ♦ Ji F ₂ 2 - 5 * CuO 0 - 2 * NlO 0.5 - 1.5 % MnO 0 - 1 % CoO 0.5 - 1.5 *

A hit-resistant material or · 1η · combination of durable materials is ground and in a Amount in the range of about 25 ble 75 Qew.Jf of the basic Base coat exusasysetung added. In the case of the Bavarian and coating composition, which components in » within the Berelohe specified above, a Heating temperature in the range of approximately 758 to 817 ° C expected be, and when the milled amount hitgebeatMadiger Oxyde has been given, the image composition has a hot temperature in the range of about 84 to 900 ° C.

When choosing a giss-like SoMtlldeokoveruges is to add to the general requirement that he be a relatively smooth, corrosion-resistant surface, which is chemically bonded to the coating, the deodorant coating have a heating temperature approximately that of that of the basic level corresponds to or below. Heat up «

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temperatures for the deodorant coating that are significantly higher than those of the orundum coating "must be avoided, because a higher temperature improves the properties of the base coating could affect in a harmful way.

A glass-like enamel that has been used with success Fry powder, which has a continuously smooth, uninterrupted, Corrosion-resistant glass coating In combination with the above-mentioned basic coating composition produced, contains the following components

SiO ₂ 62-67 jS

TiOg 1 - 5 ί

ZrO ₂

LIgO Na ₂ O KgO

CoO NlO MnO

The above composition has an · » heating or conversion temperature lower than 885 ° C. The invention overcomes known methods for applying a Qlasoverzugee considerable Cost savings achieved. The method according to the invention only requires a single furnace phase and only

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5 - 9 * 2 - 6th % 1 5 % 15 - 18th % 0 - $ 2 - 5 % 0.5 - 1 , 5 O - 1 % 0 - 1

The application of some deodorant coating. In comparison known methods for applying the coating are known in which a number of intermediate coatings are required and intermediate KUhI and heating processes must be provided, uneconomical. In the method according to the invention, a single top coating is applied the pipe applied «while it is still in itself heated resulting from the heating up of the base surface Condition is "and this deck cover is also inside" half of the furnace converted. Approved by the procedure In comparison to known methods, the invention is therefore the method of applying an oil coating to a The area of a pipe required is considerably reduced.

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Claims (2)

Claims 1. Method of applying a glass coating to the inner surface of a tubular object "thereby characterized in that a base coat glass composition is applied to the inner surface of the tubular article is heated, the base coat-glass composition is used to create a hard, non-sticky, glass-like To produce 'coating, which fused onto the inner surface of the tubular object, an apparatus is 1st introduced for applying a DeokUberzug-Olaszusammensetzung into the tubular object, a part of the application device is supported on the bearing the GrundUberzug surface on which the vitreous with enamel base coating coated inner surface of the tubular object, a deodorant coating-glass composition is applied and the deodorant coating composition is applied to the glass-type } against the enamel base coat is melted evenly in order to create a tubular object that has a smooth, has uninterrupted, corrosion-resistant inner surface. 2. The method according to claim 1, characterized by that the recommended suction-aiAS composition is at a temperature heated in the range of about 815 ° to 900 ° C will. J). According to claim 1, characterized in that the tubular® object during "ad d" e application "<* ·" 30S838 / 0526 BAD The cover is continuously rotated around its longitudinal axis will. The method according to claim 1, characterized in that the surface provided with the base coat is kept at approximately the transition temperature of the top coat / glass composition during the application of the top coat / glass layer composition to the base coat and during the melting of the top coat / amine composition onto the base coat composition. 5. The method according to claim 1, characterized in that the vitreous enamel baseUberziigsEusaiarnensosition heat-resistant materials in an amount of about J> 5 to 55 üew.j?, Alkaline earth metal oxides in an amount of about 1 to 10 wt. ^, Alkali metal oxides in an amount of about 1o to 25% by weight, alkali metal halides in an amount of about 1 to 7 wt . JRO weight ^ and an addition of a ground HEAT-a tändigen material "in an amount of about 25 to 75 percent.? contains. 0. The method according to claim 1, characterized in that a vitreous EttallgrundUberzugezusanunensetzung is used which is made up of a basic basic coating addition to which a refractory material is added in an amount of about 25 to 75 wt 909838/0526 SAD 15216 ^ 5 - Po - The material has a melting point above 870 C Has. 7. The method as claimed in claim 1, characterized in that the vitreous EtnnilGrundUberzuRSzoRSzunetzung consists of a basic arundUberzugverbindungen to which a heat-resistant ^ material is added, which comprises the group consisting of oxides, borides, fluorides, nitrides, silicides, aluminum and combinations of them , selected iil. and a melting point above un ^ efjihr 870 ⁰ C. 8. An object which has a metal part and a basic glass composition that adheres to it and which can be melted onto the metal part, characterized in that the basic coating material contains an amount of added, ground protective material from about i? 5 to 75 wt.? and has a melting temperature that is above about 815 ° C. 9. KorroGionsfPr.ter tubular object comprising a metal tube., Characterized by an on the inner surface of the. Metal pipe newly melted first glass coating, which has a content of added ground refractory material in an amount of about 25 to 75 wt .; ¹ comprises' and a Umwandlunge tempera door in the range of about 815 ° to 900 ⁰ C, has and "inen to the first OlasUberzug molten second aiasüberzug whose transformation temperature is below 9oo ° C and a smooth, uninterrupted corrosion-resistant surface has. 909838/0526 BAD original