JP3095668B2 - Anticorrosion structure and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion structure having excellent corrosion resistance and abrasion resistance in, for example, a molten salt treatment facility and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, demand for surface-treated steel sheets having excellent corrosion resistance, weldability, and paintability has rapidly increased in automobiles, civil engineering, structural members for buildings, and home electric appliances. Hot-dip galvanizing, electro-galvanizing,
Hot-dip aluminum plating is the mainstream.

[0003] In addition, alloy plating using a molten salt having more corrosion resistance than zinc or aluminum plating is being developed. The hot-dip plating is generally performed using an electrolyte containing a halide.

[0004] For such equipment, a method of coating a polyimide resin or a sheet-like molded product having corrosion resistance and heat resistance to halide in a plating tank, an electrode portion and the like is currently employed. In addition, steel sheet conveying members,
For example, rolls and the like are subjected to alumina spraying in consideration of wear resistance, and are further subjected to glass-based sealing or the like for anticorrosion purposes.

FIG. 3 shows an example of a typical anticorrosion measure of a conventional component. FIG. 3A shows a state in which a polyimide resin sheet is attached to the inner surface of the molten salt container. As shown in the figure, a polyimide resin sheet 02 is adhered to the inside of the main body of the molten salt container 01 to have an anticorrosion structure.

FIG. 3 (b) shows an example of a roll for transporting a steel sheet. As shown in FIG.
Is provided with an alumina plasma sprayed coating 04 in consideration of wear resistance, and further, a porous glass sealing material 05 is impregnated in the alumina coating 04 to improve corrosion resistance. I'm trying.

[0007]

[0006] Among the methods which have been conventionally implemented as measures for preventing corrosion of components, there is a method of coating a polyimide resin. As a step of this method, generally, after the surface of a base material is roughened and cleaned by sand blasting or the like, a polyimide resin is applied by spraying or brush coating, and a thermosetting treatment is performed by heating. This method has the following disadvantages. (1) When the base component is a welded structure or the like, uniform coating cannot be performed, and the thickness of the coating film greatly varies. (2) There is no anchor effect for sufficient paint adhesion to the base material surface, and a peeling phenomenon is likely to occur due to a temperature change during operation. (3) The coating film is a relatively thin film and is easily broken by flaws, and the corrosion resistance is reduced.

Further, in the method of attaching a polyimide resin sheet to the surface of a component member, molten salt is inserted at a joint portion between the sheets, so that the corrosion preventing effect of the base material is lost. It is difficult to apply the sheet, and there are many problems in construction.

Further, a method of penetrating and sealing a glass-based sealing material after ceramic spraying in consideration of wear resistance, for example, alumina spraying is adopted. However, this method has the following disadvantages. (1) In any thermal spraying method including thermal plasma spraying, the ceramic sprayed coating has fine pores and does not become a complete anticorrosive coating. For this reason, thermal spraying of a thick film is performed for the purpose of minimizing pores reaching from the surface to the base material as much as possible. However, at present, complete anticorrosion cannot be measured. In addition, when the thickness of the ceramic is increased, problems such as cracks in the coating due to generation of shear stress at the contact interface between the base material and the thermal expansion coefficient due to a difference in thermal expansion coefficient occur. (2) Various kinds of sealing materials are implemented by air sealing or vacuum sealing as anticorrosion measures. However, this sealing is only pores existing on the surface, and penetrates pores (closed pores) existing inside. do not do. In addition, a solvent is used for the sealing material, and the solvent evaporates at the time of drying, so that microscopic gaps are generated in the pores. When used in such a situation, even if the ceramic surface is slightly rubbed, this sealing material disappears and its effect disappears. As a result, there is a disadvantage that the anticorrosion property is lost and the operation becomes impossible within a short time.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an anticorrosion structure capable of maintaining a stable operation for a long time by preventing corrosion of components in a corrosive atmosphere, and an object of the present invention.

[0011]

A first aspect of the present invention for achieving the above object is as follows.
The anticorrosion structure according to the invention is characterized in that an imide-based resin layer in which a pigment is dispersed as a first layer and a ceramic layer as a second layer are formed on the surface of the imide-based resin layer, on the surface of the base material. And

In the method for producing an anticorrosion structure according to the first aspect of the present invention, after the surface of a base material is coated with an imide resin in which a pigment is dispersed, a heat reaction curing treatment is performed to disperse the pigment of the first layer. An imide-based resin layer is formed, and then ceramics are sprayed on the surface of the first imide-based resin layer by a thermal plasma spraying method to form a second ceramics layer.

According to a second aspect of the present invention, there is provided an anticorrosion structure comprising, on a substrate surface, an imide resin layer in which a pigment is dispersed, and a fluororesin powder or a ceramic powder on the surface of the imide resin layer. And a coating layer.

A method for producing an anticorrosion structure according to a second aspect of the present invention, which achieves the above object, comprises coating an imide resin in which a pigment is dispersed on the surface of a base material, and then performing a heat-reaction curing treatment to remove the pigment of the first layer. Forming a dispersed imide resin layer, then coating the surface of the first imide resin layer with a fluororesin powder or a ceramic powder to form a coating layer, and then performing a heat-reaction curing treatment; It is characterized by.

In the first and second anticorrosion structures, a ceramic layer is formed as an underlayer between the surface of the substrate and the imide resin layer in which the pigment of the first layer is dispersed. .

In the first and second anticorrosion structures, the ceramic forming the second layer and the underlayer is aluminum oxide (Al ₂ O ₃ ).

In the first and second anticorrosion structures, the imide resin forming the first layer is a polyimide resin.

In the first and second anticorrosion structures, the pigment of the imide resin forming the first layer is aluminum oxide (Al ₂ O ₃ ).

In the first and second methods for producing an anticorrosion structure, before the coating of the imide resin in which the pigment of the first layer is dispersed, a ceramic as an underlayer is formed on a substrate surface by a thermal plasma spraying method. Is sprayed.

The above structure is characterized in that the surface of the base material is subjected to a shot blast treatment.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a structural view of a film having an anticorrosion structure obtained according to the first invention of the present invention. As shown in FIG. 1, an alumina film 12 is formed on the surface of a base material 11 by thermal plasma spraying of alumina as a ceramic having excellent adhesion as a base layer. The alumina coating 12
A polyimide film 13 formed by coating a reaction-curable polyimide resin in which a pigment excellent in anticorrosion properties is dispersed as an imide resin is formed thereon. Further, an alumina film 14 is formed on the surface of the polyimide film 13 of the first layer by the same thermal plasma spraying as that of the alumina film 12 of the underlayer, so that the multilayer film 15 having corrosion resistance and abrasion resistance is protected from corrosion. It has a structure.

As an example of the production of the first anticorrosion structure, first, shot blasting is performed in advance for the purpose of cleaning the surface of the base material 11, for example, iron and steel, and improving the adhesion of the thermal spray coating, and then forming an underlayer as an underlayer. Then, an alumina film 12 is formed by thermal spraying using a thermal plasma spraying method. Thereafter, a first layer of a polyimide resin film 13 whose main purpose is corrosion prevention is also applied to the surface of the alumina film 12 while also serving as a sealing of the alumina film 12, and a thermosetting treatment is performed. Further, for the purpose of imparting abrasion resistance, for example, alumina is spray-coated with thermal plasma as a ceramic as a second layer to form an alumina film 14 to form a multilayer film 15.

The alumina sprayed film 12 as the underlayer is chemically very stable, shows sufficient corrosion resistance to halides as a main component of the molten salt, and improves adhesion of the imide resin coating as the first layer. It is effective for Incidentally, the alumina film 12 of the underlayer may be omitted if the temperature change cycle during operation is small, especially when the adhesion is not required, and may be appropriately provided according to the purpose. .

Here, the anticorrosion structure in the present invention can be applied, for example, to a molten salt treatment facility, but the structure of the present invention is not limited to this. The molten salt processing equipment and the like are all components that come into contact with the molten salt, and the main ones are, for example, various rolls, processing vessels or piping for circulating molten salt, pumps, and the like. Most of these substrates are made of a steel-based material, and an alumina (A)
1 ₂ O ₃ ) film, the first layer is a polyimide resin film 13 as an imide resin layer, the second layer is an alumina film 14 as a ceramic layer 12 similar to the underlayer, and a corrosion-resistant and wear-resistant material is laminated. Configuration.

The second-layer alumina film 14 is excellent in corrosion resistance and abrasion resistance due to molten salts, halides and strong acids generated by hydrolysis of these salts.
The polyimide resin film 13 of the first layer prevents corrosion media penetrating from extremely minute and minute pores existing in the alumina film 12 of the base layer, and has corrosion resistance.

[0027] Corrosion of components is almost non-corrosive during normal operation because the molten salt does not contain moisture, but cleaning after operation, mainly with water, is performed. At this time, the molten salt that has adhered and solidified reacts with water at this time, and a large amount of hydrogen acid,
For example, HCl, HF, HBr, HI, etc. are generated and the corrosion proceeds. The present invention is stable in such an environment for a long time without causing permeation of the hydrogen acid to the base material, and is very advantageous in operation.

Here, in the present invention, the ceramic of the underlayer and the second layer is aluminum oxide (alumina; Al
₂ O ₃ ). This alumina, it is necessary to use the highest purity of the high purity is preferably used for thermal spraying is usually preferred for performance,
Practically, 98% or more is preferable. In addition, since denseness is important for preventing penetration of the molten salt during operation and penetration of the cleaning liquid during cleaning, the thermal spraying powder has a small average particle size,
In addition, those having a narrow particle size distribution range are preferable,
There is no particular limitation depending on the spraying conditions.

The method of spraying ceramics is generally carried out in the air, but a method using reduced pressure (low pressure) spraying is more excellent for further improving the compactness.

The alumina sprayed coating of the second layer can be formed by the same spraying material and spraying process as the underlayer. The film thickness can be arbitrarily set in consideration of wear resistance. 100 μm is suitable. This is 50 μm
In the following, the stability of the coating is lacking, which is not preferable. On the other hand, when the thickness exceeds the upper limit of several hundreds μm, if the alumina coating is too thick, direct thermal spraying on metal is not preferable because of the problem of cracking and peeling due to the difference in thermal expansion. Therefore, the upper limit is preferably set to about 200 μm from the viewpoint of thermal spraying.

For the polyimide resin film 13 as the imide resin of the first layer, a reactive curable polyimide having the most excellent heat resistance and the most excellent corrosion resistance among the resins is used.

Here, as the imide resin which can be used at a high temperature in order to prevent the penetration of the corrosive substance in the first layer, a general-purpose anticorrosion resin may be used as appropriate. Can be exemplified by a polyimide resin and a bismaleimide resin, but it is preferable to use a polyimide resin from the viewpoint of acid resistance and hydrolysis resistance.

Here, the imide resin of the first layer in the present invention can be selected from a number of production methods. For the purpose of the present invention, a pigment is added to the resin and the strength of the resin film itself and the base material due to heat are used. Is suitable so that it can follow the deformation of the material, that is, has a stress relaxation property. The pigment to be added to the imide-based resin for relaxing the stress may be appropriately selected from alumina (Al ₂ O ₃ ), silica, titania and the like which are sufficiently corrosion-resistant in the present environment. Further, as the compounding amount of the above pigment,
A range of 20% to 60% by volume concentration is practical. When the content is less than 20%, the number of particles is small and the effect is not expected. When the content is too large, the toughness of the resin film itself is insufficient, and pores are formed in the layer, and do not play a role of anticorrosion. This is because both are not preferred.

The imide resin layer of the first layer can be formed by any method such as brush coating or spraying. Further, the thickness of the resin is practically 20 μm to 100 μm from the viewpoints of corrosion resistance, stability of the resin film, and economy.

The second layer of the sprayed alumina film 14 uses the same sprayed material as that of the above-described underlayer alumina film 12. The thicker the film, the better the film thickness in consideration of wear resistance. 50 μm to 200 from the viewpoint of peeling
μm is suitable.

FIG. 2 is a structural view of a film having an anticorrosion structure obtained according to the second invention of the present invention. As shown in FIG. 2, on the surface of the base material 11, an alumina film 12 is formed as a base layer by thermal plasma spraying of alumina as a ceramic having excellent adhesion. The alumina coating 12
A polyimide film 13 is formed by coating a reactive curable polyimide resin in which a pigment having excellent anticorrosion properties is dispersed as an imide resin. Further, a coating layer 16 is formed by spraying a fluororesin powder or a ceramic powder on the surface of the first layer of the polyimide film 13 to form a corrosion-resistant structure of a multilayer film 17 having corrosion resistance and wear resistance. It is.

Here, when the fluororesin powder is sprayed as the coating layer 16, the purpose is to reduce the contact friction coefficient with the object to be plated, for example, the steel plate of the substrate 11, and to prevent corrosion. Further, when the ceramic powder is sprayed, the insulating property and the wear resistance are aimed at.

As an example of manufacturing the second anticorrosion structure, first, shot blasting is performed in advance for the purpose of cleaning the surface of the base material 11, for example, iron and steel, and improving the adhesion of the thermal spray coating. An alumina film 12 is formed by thermal spraying using a thermal plasma spraying method. Thereafter, the first layer of polyimide resin film 13 whose main purpose is to prevent corrosion by also sealing the alumina film 12 on the surface of the alumina film 12
And heat-cured. Immediately after the first layer of the polyimide resin film 13 is formed, a coating layer 16 is formed by spraying a fluorine resin powder or a ceramic powder to form a multilayer film 17.

The alumina film 12 as the base layer and the polyimide film 13 as the first layer are the same as those of the above-described anticorrosion structure of the first invention, and therefore the description thereof is omitted.

The fluororesin used as the particles sprayed to form the coating layer 16 constituting the multilayer coating 17 having the second anticorrosion structure of the present invention is preferably a fluororesin which can withstand this kind of environment. Ethylene chloride and the like are suitable, but not limited thereto.

The particle size of the fluororesin is not particularly limited, but is generally preferably several μm to several tens μm. This has the disadvantage that if it is less than several μm, secondary aggregation of particles occurs and stable transport cannot be performed, and if it is too large, uniform coating cannot be performed.
This is because both are not preferred.

The ceramic particles are preferably alumina from the viewpoint of corrosion resistance and abrasion resistance, and the particle diameter is suitably several μm to several tens μm for the same reason as for the fluororesin.

The thickness of the coating layer 16 made of these particles is as follows:
The purpose is to reduce the coefficient of friction with the sheet passing material and to improve the wear resistance due to sliding, and it is not necessary to make the thickness too large. As a method for coating these particles, an electrostatic coating apparatus is generally used, but the coating method is not particularly limited.

Of the powders to be coated on the surface layer of the polyimide resin film 13 of the first layer, in the case of fluororesin, the coefficient of friction with the steel plate is reduced to prevent the abrasion of the polyimide resin, and the wettability to water is poor. In addition, it also serves to prevent corrosive substances from penetrating due to the ease of repelling water during washing. In the case of alumina particles, they are hard particles, have excellent wear resistance due to sliding with a steel plate, and extend the life.
Furthermore, it is a lamination of fine particles, and has a feature that damage due to heat, for example, cracking does not occur.

As described above, according to the first anticorrosion structure of the present invention, a ceramic film 12 made of ceramics having excellent corrosion resistance is formed as an underlayer if necessary, and the first layer of the ceramic film 12 is formed on the surface of the ceramic film 12. An imide resin layer 13 coated with a dense and corrosion-resistant imide resin is formed as a coating layer, and the imide resin layer 13 is formed as a second layer.
By forming a multilayer coating 15 having a ceramic coating 14 having corrosion resistance and abrasion resistance formed on the outermost layer of the above, the corrosion resistance is extremely excellent. It is to be noted that the ceramic film 12 of the underlayer may be omitted.

According to the second anticorrosion structure of the present invention, if necessary, a ceramic film 12 made of ceramic having excellent corrosion resistance is formed as an underlayer, and a first coating layer is formed on the surface of the ceramic film 12. An imide-based resin layer 13 coated with a dense and corrosion-resistant imide-based resin
To form a coating layer 16 by spraying a fluororesin powder or a ceramic powder as a coating layer.
With this configuration, the anticorrosion property is extremely excellent. It is to be noted that the ceramic film 12 of the underlayer may be omitted similarly.

[0047]

EXAMPLES Hereinafter, specific examples of the present invention will be described to clarify the effects of the present invention.

First, the effects of the present invention will be clarified by giving an embodiment according to the first invention of the present invention.

Example 1 In order to investigate the performance of the multilayer coating film of the present invention,
Two kinds of films of the present invention and two kinds of films for comparison were prepared.
Using a molten salt mainly composed of lCl ₃ , [200 ° C. ×
16 hours + boiling water 8 hours] was repeated to observe the film surface.

Coating film of the present invention: Test Example Polyimide resin 40 μm as a first layer on substrate SS400
m coating, 2 steps (80 ° C x 2 hours, 230 ° C
× 2 hours), and the second layer was subjected to a purity of 99.
8%, white alumina having an average particle diameter of 20 μm spray-coated with a thickness of 200 μm by atmospheric plasma spraying.
The pigment to the polyimide resin was obtained by adding 40% by volume of alumina particles having an average particle size of 1.0 μm.

Test Example A base layer, SS400, was spray-coated with a 200 μm-thick white alumina having a purity of 99.8% and an average particle diameter of 20 μm as an underlayer by an atmospheric plasma spraying method. Spray coated polyimide resin blended with a pigment of 80 ° C × 2 hours, 230 ° C
A reaction hardening treatment of × 2 hours was performed to a film thickness of 100 μm. Further, the second layer is spray-coated with the same white alumina as the underlayer.

Comparative coating film: Comparative example A base material SS400 coated with bismaleimide resin 100 μm. COMPARATIVE EXAMPLE A base material SS400 coated with a bismaleimide resin of 100 μm and a second layer of white alumina having a purity of 98% and an average particle size of 25 μm by thermal plasma spraying with a thickness of 200 μm by thermal spraying.

The test specimen had a diameter of 20 m.
m, the length was 200 mm, and the tip was a spherical shape with a radius of 10 mm. A test was conducted by immersing the molten salt containing AlCl ₃ as a main component at 200 ° C. for 16 hours and then immersing in boiling water for 8 hours.
The results of observing the appearance of the specimen surface as a result of this test are shown in Table 1 below.

As a result, the comparative film had peeled off after about one cycle in an area ratio of the film surface of about 70%. In addition, about 30% of the comparative film generated red rust after two cycles, and a swelling phenomenon was observed in part of the film. On the other hand, in the test examples and the coatings, no damage to the coating was observed even after 10 cycles.

[0055]

[Table 1]

Example 2 In order to evaluate the actual performance of the multilayer coating film of the first invention, the evaluation was performed in a seal roll of an actual molten salt treatment facility under an actual use environment. The seal roll substrate was SS400, and the surface of the substrate was coated with a multilayer coating, which is one of the present invention. In other words, 99.8% pure white alumina is applied to the underlayer by plasma spraying for 20 minutes.
After spraying 0 μm, the first layer is coated with a polyimide resin having a volume ratio of alumina pigment of 40% by 40 μm, and the second layer is coated with 99.8% pure white alumina by plasma spraying.
0 μm was sprayed. The roll was mounted on an actual machine and operated for about one month (five times washing with water was performed). As a result, the roll surface was not damaged at all, and no trouble such as abrasion was observed even by contact with the steel sheet.

Next, the effects of the present invention will be clarified by giving an embodiment according to the second invention of the present invention.

Example 3 In order to investigate the performance of the multilayer coating film of the present invention,
Two kinds of films of the present invention and two kinds of films for comparison were prepared.
Using a molten salt mainly composed of lCl ₃ , [200 ° C. ×
16 hours + room temperature 8 hours] was repeated, and the film surface was observed.

Coating film of the present invention: Test Example White alumina having an average particle size of 20 μm was applied as a base layer to the base material SS400 by an atmospheric plasma spraying method to a thickness of 200 μm.
After thermal spray coating, the first layer is polyimide resin 40μm
Coating, and immediately afterwards, an average particle size of 2μ as a coating layer
m is sprayed with an electrostatic coating device until the polyimide resin surface is completely covered with ethylene tetrafluoride, and then subjected to a reaction hardening treatment in two stages (80 ° C. × 2 hours, 230 ° C. × 2 hours). Carried out. Test Example White alumina having an average particle diameter of 20 μm as a base layer was 200 μm on the base material SS400 by an atmospheric plasma spraying method.
After thermal spray coating, the first layer is polyimide resin 40μm
Immediately after coating, an average particle size of 5μ
After spraying alumina powder of m with an electrostatic coating apparatus until the entire surface of the polyimide resin was covered with alumina, a reaction hardening treatment was performed under the same conditions as in the test examples.

Comparative coating film: Comparative example The first layer had a purity of 98% and an average particle size of 25 μm on the base material SS400.
m of white alumina was spray-coated with a thickness of 200 μm. Comparative Example Purity 98%, average particle size 25μ in the first layer on the base material SS400
After spray coating 200 m of white alumina with a thickness of 200 μm, the second layer was coated with a polyimide resin of 40 μm, and then subjected to a reaction hardening treatment in two stages (80 ° C. × 2 hours, 230 ° C. × 2 hours). Comparative Example The same white alumina as that of the first layer was spray-coated to a thickness of 100 μm as a third layer on the surface of the coating having a two-layer structure of the comparative example.

The test specimen had a diameter of 20 m.
m, the length was 200 mm, and the tip was a spherical shape with a radius of 10 mm. After a molten salt containing AlCl ₃ as a main component at 200 ° C. for 16 hours, a test was carried out by immersion in boiling water for 8 hours. The result of observing the appearance of the specimen surface as a result of this test,
The results are shown in Table 2 below.

As a result, the peeling occurred in the comparative film over about 70% in the area ratio of the film surface after two cycles. In the comparative film, about 30% red rust was generated after 2 cycles. In the comparative film, about 30% red rust and a partial blistering phenomenon were observed after 2 cycles. On the other hand, in the film of this test example and the film of this example, no damage to the film was observed even after 10 cycles.

[Table 2]

Example 4 In order to evaluate the actual performance of the multilayer coating film of the second invention, the evaluation was carried out in a seal roll of an actual molten salt treatment facility under an actual use environment. The seal roll substrate was SS400, and the surface of the substrate was coated with a multilayer coating, which is one of the present invention. That is, 99.8% pure white alumina was applied to the underlayer by plasma spraying.
40% by volume of alumina pigment in the first layer after thermal spraying
After coating 40μm of the polyimide resin,
As a coating layer, ethylene tetrafluoride powder having an average particle size of 2 μm was sprayed by an electrostatic coating apparatus until the polyimide resin was entirely covered. Attach this roll to the actual machine,
Monthly operation (washing with water five times on the way)
As a result, the roll surface was not damaged at all and the contact with the steel sheet was covered with the ethylene tetrafluoride powder, and the coefficient of friction with the steel sheet was very small. Therefore, no damage was recognized on both the plating surface and the roll.

Example 5 In order to evaluate the actual performance of the multilayer coating film of the second invention, the evaluation was performed in a seal roll of an actual molten salt treatment facility under an actual use environment. The seal roll substrate was SS400, and the surface of the substrate was coated with a multilayer coating, which is one of the present invention. In other words, 99.8% pure white alumina is applied to the underlayer by plasma spraying for 20 minutes.
After spraying 0 μm, the first layer was coated with 40 μm of a polyimide resin having an alumina pigment of 40% by volume, and then sprayed as a coating layer with an electrostatic coating device on an alumina powder having an average particle size of 5 μm until the polyimide resin was completely covered. Carried out. The roll was attached to the actual machine and operated for about 2 months (washing with water 10 times on the way). As a result, the alumina layer on the roll surface did not have any damage such as cracks and peeling, and contact with the steel plate. No more than abrasion of the roll surface and damage to the surface of the plated steel sheet were observed.

[0065]

As described above, according to the first invention, multilayer coating, that is, polyimide as an imide resin having excellent corrosion resistance and denseness, and alumina as a ceramic having excellent wear resistance are provided. By coating in multiple layers, it is possible to have stable operation for a long time because it has excellent abrasion resistance without corrosive to corrosive substances generated during cleaning and corrosive substances generated during cleaning by severely corrosive processing. Needless to say, the present invention has great industrial value because it can greatly contribute to cost reduction, including improvement of product quality and productivity, and reduction of maintenance and inspection work of equipment.

According to the second aspect of the present invention, alumina is coated as a ceramic having excellent adhesion and abrasion resistance, and immediately after a polyimide film as a corrosion-resistant imide resin is applied thereon, the coating is performed. By spraying ethylene tetrafluoride or alumina powder as a layer, it is effective to reduce the coefficient of friction with the steel sheet, improve the wear resistance by covering the hard particles on the surface, and prevent damage to the plated steel sheet. is there.

As described above, the present invention is applied to a severely corrosive substance such as a molten salt treatment facility and a corrosive substance generated during cleaning, and has characteristics of being excellent in abrasion resistance without corrosion. Not only can it be operated stably for a long time, but also it can greatly contribute to cost reduction, including improvement of product quality, productivity, and maintenance and inspection work of equipment, and is of industrial value.

[Brief description of the drawings]

FIG. 1 is a sectional view of a film showing a first multilayer coating film structure of the present invention.

FIG. 2 is a sectional view of a film showing a second multilayer coating film structure of the present invention.

FIG. 3 is a diagram showing an example of a conventional anticorrosion measure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Substrate 12,14 Aluminum film 13 Polyimide resin film 15,17 Multilayer film 16 Coating layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08J 7/04 CFG C08J 7/04 CFGK 7/06 CFG 7/06 CFGZ C23C 4/10 C23C 4/10 // C23C 28/04 28/04 (72) Inventor Sadato Shigemura 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Research Laboratory (72) Inventor Toyoaki Yasui 4-622 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. Mitsubishi Heavy Industries, Ltd.Hiroshima Research Institute (72) Inventor Shizuaki Ueno 4--22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Yasuhiro Yamamoto Kitahama, Chuo-ku, Osaka, Osaka 4-5-233 Sumitomo Metal Industries, Ltd. (72) Inventor Takeshi Hattori 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries Co., Ltd. In-house (72) Inventor Junichi Uchida 4-5-33 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Inside Sumitomo Metal Industries Co., Ltd. (72) Inventor Yoshio Harada 4-3-1-4 Fukae-Kitacho, Higashinada-ku, Kobe, Hyogo Prefecture In-company (72) Inventor Kazumi Tani 4-13-4 Fukaekita-cho, Higashinada-ku, Kobe-shi, Hyogo Tokaro Corporation (56) References JP-A-60-212349 (JP, A) JP-A-61-104060 ( JP, A) JP-A-2-26674 (JP, A) JP-B-57-23716 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 C08J 7/04 C23C 4/10

Claims (6)

(57) [Claims] 1. An anticorrosion wherein an imide-based resin layer in which a pigment is dispersed as a first layer and a ceramic layer as a second layer are formed on the surface of the imide-based resin layer on a substrate surface. Construction. 2. An anticorrosion, wherein an imide-based resin layer in which a pigment is dispersed and a coating layer made of a fluororesin powder or a ceramic powder are formed on the surface of the base material. Construction. 3. The anticorrosion structure according to claim 1, wherein a ceramic layer is formed as a base layer between the surface of the base material and the imide-based resin layer in which the pigment of the first layer is dispersed. And anti-corrosion structure. 4. After coating an imide resin in which a pigment is dispersed on the surface of a base material, a heating reaction curing treatment is performed to form an imide resin layer in which a pigment of a first layer is dispersed. A method for producing an anticorrosion structure, comprising forming a second ceramic layer by spraying ceramics on the surface of the imide resin layer of the layer by a thermal plasma spraying method. 5. An imide-based resin in which a pigment is dispersed is coated on the surface of a base material, and then a heat-reaction curing treatment is performed to form an imide-based resin layer in which a pigment of a first layer is dispersed. A method for producing an anticorrosion structure, comprising coating a surface of an imide-based resin layer with a fluororesin powder or a ceramic powder to form a coating layer, and then performing a heat-reaction curing treatment. 6. The method for manufacturing an anticorrosion structure according to claim 4, wherein the ceramic is sprayed on the surface of the base material by a thermal plasma spraying method before the coating of the imide resin in which the pigment of the first layer is dispersed. A method for manufacturing an anticorrosion structure, comprising: