CN109280875B - Anti-corrosion coating structure for boiler heating surface - Google Patents

Anti-corrosion coating structure for boiler heating surface Download PDF

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CN109280875B
CN109280875B CN201811191229.2A CN201811191229A CN109280875B CN 109280875 B CN109280875 B CN 109280875B CN 201811191229 A CN201811191229 A CN 201811191229A CN 109280875 B CN109280875 B CN 109280875B
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coating
corrosion
heating surface
metal
base material
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CN109280875A (en
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齐晓宾
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Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
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Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal

Abstract

The invention relates to an anti-corrosion coating structure for a heating surface of a boiler, and belongs to the field of preparation of boiler coatings. The coating structure comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and the base material, and the surface coating and the base material are in close contact to form a heating surface; the surface coating is composed of oxides; the inner layer coating is composed of metal element or oxide coating, and the components of the adjacent coatings are different. The invention is based on the key effect of the protective oxide film in the corrosion resistance process, combines the applicability of the corrosion resistance of metal elements/oxides to the corrosion environment, and sets the coating to be a multilayer structure.

Description

Anti-corrosion coating structure for boiler heating surface
Technical Field
The invention belongs to the field of boiler coating preparation, and particularly relates to a setting mode of an anti-corrosion coating structure of a boiler metal heating surface for burning corrosive fuels (such as high-alkali/chlorine coal, biomass, solid waste and the like).
Background
Corrosion is a common ash problem on metal heating surfaces of certain corrosive fuels (such as high-alkali high-chlorine coal, biomass, solid waste and the like) in the boiler combustion process. The corrosion damages boiler hot end parts (a superheater, a reheater and the like), thins the metal heating surface, causes uneven heating of the heating surface, causes local high temperature, and even induces a pipe explosion accident in severe cases. Not only brings serious potential safety hazard, but also greatly increases the maintenance frequency and the operation cost of the boiler unit and reduces the production efficiency. Therefore, the corrosion problem has been the main reason for limiting the wide-scale application of corrosive fuels.
At present, the metal heating surface corrosion prevention measures are mainly started from two aspects of heating surface materials and protective coatings. The corrosion resistance of the metal heating surface can be improved to a certain extent by increasing the content of alloying elements (Ni and Cr) or spraying a protective coating on the surface, but still face the economic pressure caused by the increased content of the alloying elements and the undesirable corrosion resistance of the sprayed protective coating. Moreover, most currently used protective coatings are not oxides of alloying elements, but rather alloying elements. The corrosion resistance of such coatings is not greatly improved because it is not guaranteed that the sprayed alloying elements form a dense protective oxide film before corrosion occurs.
At present, although some prior art is mentionedSome oxide coating preparation methods are provided, but the single coating structure provides a single protection measure for the internal matrix material and cannot inhibit certain corrosive media (such as Cl) penetrating into the coating2) The resulting internal corrosion; more importantly, the single-layer coating structure neglects the applicable relation between the corrosion resistance of metal elements/oxides and the corrosion environment, does not fully exploit the corrosion resistance potential of different metal elements/oxides, and increases the corrosion resistance of the coating by simply relying on a large amount of high-quality corrosion-resistant materials to a certain extent, thereby causing resource waste and increasing the manufacturing cost of the corrosion-resistant coating.
In summary, the existing methods for overcoming the corrosion problem of the heating surface of the boiler still have the problems of high cost, unsatisfactory effect, short service life of the coating and the like, and therefore, the invention provides a brand-new arrangement mode of the metal corrosion-resistant coating structure of the boiler using the corrosive fuel to solve the problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an anti-corrosion coating structure for a boiler heating surface, the coating is set to be a multilayer structure based on the key effect of a protective oxide film in the anti-corrosion process and combined with the applicability of the anti-corrosion capability of metal elements/oxides to the corrosion environment, and the anti-corrosion coating is set in a mode of forming an efficient anti-corrosion layer on the surface of the metal heating surface, so that the corrosion of corrosive fuel to the boiler metal heating surface in the combustion process is effectively prevented.
The invention aims to provide a corrosion-resistant coating structure for a heating surface of a boiler.
The other purpose of the invention is to provide the application of the corrosion-resistant coating structure.
In order to achieve the above purpose, the invention specifically discloses the following technical scheme:
the invention discloses an anti-corrosion coating structure of a boiler heating surface, which comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact to form a heating surface; the surface coating is composed of oxides; the inner layer coating is composed of metal element or oxide coating, and the components of the adjacent coatings are different.
The reason for the present invention to set the coating layer to the above structure is that: for boilers burning corrosive fuels, the corrosion phenomenon caused by the corrosive fuels is mainly related to the fact that the corrosive fuels contain high-concentration corrosive substances such as active chlorine, alkali metal (sodium and potassium) salts and the like, so that the fuels can corrode alloy elements in the surface coating of the heated surface of the metal in an active oxidation corrosion mode, so that a dense protective structure of the surface layer of the heated surface of the metal is damaged, a channel is provided for the corrosive medium to penetrate into the heated surface of the metal, and once the protective coating is corroded and penetrated, the metal matrix is accelerated to be corroded, so that a more serious corrosion problem is induced. Therefore, the corrosion resistance of the surface coating is critical, the formation of a compact protective film on the surface is critical for corrosion resistance, the outer coating is set as a compact protective metal oxide coating, and the inner coating is set as a metal element or metal oxide coating, so that not only can corrosion be inhibited on the surface of the coating, but also a plurality of protective layers can be arranged in the coating, and meanwhile, certain permeated corrosion media can be inhibited in a targeted manner, and the corrosion resistance of the whole corrosion-resistant coating is improved.
Furthermore, the thickness of the surface coating and the thickness of the inner coating are both not less than 0.8mm, the porosity is both not greater than 0.5%, and the bonding strength is both not less than 65 MPa. Due to partially corrosive media (e.g. Cl)2) Can permeate into the base material through narrow gaps in the coating to corrode the base material, and the thickness, porosity and bonding strength of the corrosion-resistant coating are controlled within the range, so that the permeation of a corrosion medium can be well prevented, and the corrosion to the base material is avoided.
Further, the inner layer coating is a multilayer structure which is formed by arranging coating layers formed by metal oxides in sequence, and the components of the coating layers adjacent to each other are different. The internal coating of the multilayer metal oxide provides a multilayer barrier to corrosive media that have penetrated the top coating, inhibiting further inward penetration of corrosive media(ii) a At the same time, according to the physical properties of the permeated corrosive medium (research shows that Cl is used as Cl)2The predominantly gaseous corrosive medium is likely to penetrate through the protective coating in an unknown manner and directly penetrate into the internal matrix material to cause internal erosion), and the internal matrix material can be blocked in a targeted manner by properly arranging the arrangement of the inner oxide coating, so that effective protection is provided for the internal matrix material.
Further, the inner layer coating is a multilayer structure composed of coating layers composed of metal oxides and coating layers composed of metal elements alternately arranged, and the compositions of the coating layers adjacent to each other are different. Firstly, the multilayer structure of the inner layer coating can set multilayer barriers for the corrosive medium which penetrates through the surface layer coating, and further inward penetration of the corrosive medium is inhibited; secondly, the metal elements used in the inner layer coating have the characteristic of being preferentially oxidized into protective oxides without being corroded by corrosive media, and by alternately arranging the inner layer metal element coatings, a new protective coating can be quickly formed to block the surface coating under the condition that the surface coating is damaged, so that the internal matrix material is effectively protected; in addition, compared with an inner layer coating structure with a plurality of metal oxide coatings arranged in sequence, the preparation process of the coating structure with the metal oxide and the metal element arranged alternately is simpler and easier.
Further, the inner coating is of a single-layer structure, and the single-layer structure is formed by mixing at least two metal oxides.
Further, the oxide may be a single oxide or a mixture of a plurality of oxides.
Further, the metal element may be a single metal or a mixture of a plurality of metal elements.
Further, the oxide includes: al (Al)2O3、Cr2O3、NiO、Fe2O3、TiO2、SiO2And the like.
The corrosion resistance of the oxide is much greater than that of the corresponding metallic element, so that, for the reasons of the multilayer structure of the coating according to the invention, the oxide is just suitable as a surface coating to the greatest extent possible to reduce the probability of corrosion occurring.
Further, the corrosion resistance of the surface coating oxide is higher than that of the inner coating oxide. Since the corrosion resistance of the oxide is much higher than that of the corresponding metal element, the surface coating is made of an oxide having high corrosion resistance, and the occurrence of corrosion can be reduced to the greatest extent when the corrosion resistance is higher than that of the oxide of the inner coating.
Preferably, the top coat is made of Al2O3The inner layer coating consists of a NiO layer and Cr2O3Layer composition of said Al2O3Layer, NiO layer, Cr2O3The layers are arranged in sequence.
Al2O3Is a metal oxide with extremely strong corrosion resistance, therefore, the invention preferentially selects Al2O3As a component of the top coat, this minimizes the occurrence of corrosion; while some gaseous corrosive media (e.g. Cl)2) The permeability is strong, and the surface coating can be penetrated with great probability, at the moment, the inner coating NiO and Cr2O3The corrosion medium is relatively inert, so that the corrosion medium can be effectively prevented from continuously permeating into the base material after the surface layer is corroded and permeated in the middle and later periods of corrosion, the three layers of metal oxides can fully exert the self corrosion resistance to perform gradient barrier on the corrosion of the corrosion medium, and the corrosion of the base material is reduced as much as possible. It should be noted that this is only an exemplary illustration, and the above technical idea can be also used to provide the coating structure with other oxides.
Further, the metal elements include Cr, Ni, Al, Fe, Mo, Mn, Nb, etc. Preferably, the metal element is Ni, since Ni and Cl2The Gibbs free energy change of the corrosion reaction between corrosion media such as HCl and the like is larger than that of other metal elements (such as Fe, Cr, Al and the like), so that Ni has stronger corrosion resistance than other metal elements; and is filled with O2、Cl2Under the environment of equal oxidizing atmosphere, Ni can react with O2Reaction to form protectionThe priority of the sexual NiO is higher than that of the sexual NiO by Cl2The reaction of corrosion, and therefore Ni is preferred in the present invention as the metal element in the inner coating.
The coating setting mode of the invention has no special requirements on the base material, and the invention is not limited, for example, the coating can be a material of a heating surface of a common boiler, and also can be a material with better corrosion resistance; the coating arrangement of the present invention also helps to substantially reduce the cost of corrosion resistance, since the corrosion resistance of the base material to self-alloying levels is greatly reduced once it has been corroded.
The invention further discloses application of the anti-corrosion coating structure in devices such as a boiler, a superheater, a reheater and a heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention arranges a plurality of layers of metal elements and metal oxides in sequence or alternatively, provides a plurality of layers of protection for internal matrix materials, increases the inward erosion difficulty of corrosive media, and greatly improves the corrosion resistance of the boiler metal heating surface burning corrosive fuel.
(2) Based on the corrosion and corrosion resistance mechanisms of the heated surface of the boiler, the invention reasonably organizes the metal elements and the oxides in the coating by utilizing the applicability of the self corrosion resistance of the metal elements/oxides to the corrosion environment, fully excavates the self corrosion resistance of the metal elements/oxides, avoids the excessive use of high-quality corrosion-resistant materials, and reduces the manufacturing cost of the corrosion-resistant coating while ensuring the corrosion resistance.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural view of a corrosion-resistant coating layer according to example 1 of the present invention.
Fig. 2 is a schematic structural view of a corrosion-resistant coating layer in example 2 of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the existing method for overcoming the corrosion problem of the heating surface of the boiler still has the problems of high cost, undesirable effect, short service life of the coating and the like. Therefore, the present invention provides an anticorrosion coating structure for a heating surface of a boiler, which is further described with reference to the accompanying drawings and the specific embodiments.
Example 1
As shown in fig. 1(a), the coating structure for resisting corrosion of the heating surface of the boiler comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact with each other to form the heating surface; the surface coating and the inner coating are both composed of metal oxide coatings, and the components of the adjacent coatings are different.
Specifically, as shown in fig. 1(b), when n is 3, the three metal oxide coatings arranged in sequence are Al sequentially from the outside to the inside2O3Coating, NiO coating and Cr2O3Coating; the base material is steel 10Cr9Mo1VNb commonly used for the heating surface of the boiler; the coating is coated on the corresponding coating in a thermal spraying mode.
Al2O3Is a metal oxide with strong corrosion resistance, and can inhibit most corrosive media (Cl)2HCl, NaCl, KCl, etc.), therefore, the present invention preferentially selects Al2O3As a component of the top coat, this minimizes the occurrence of corrosion; while some gaseous corrosive media (e.g. Cl)2) The capability of permeating the corrosion-resistant coating is strong, the coating can penetrate through the surface coating under the condition that the surface coating is intact, the inner coating NiO is relatively inert to the corrosion media, and the corrosion media can be effectively prevented from continuously permeating into the base material after the surface coating is corroded and permeated in the middle and later periods of corrosion; cr (chromium) component2O3Cannot resist corrosion of NaCl and other corrosive media to remove Cr2O3The innermost coating can effectively avoid the corrosion caused by the corrosive medium (NaCl, KCl and the like) deposited on the heating surface. Therefore, the three layers of metal oxides can fully exert the self corrosion resistance to carry out gradient barrier on the corrosion of a corrosive medium, and the corrosion probability of the base material is reduced as much as possible.
The average thickness of the surface layer coating is 0.8mm, the average thickness of the inner layer coating is 1.0mm, the average porosity is 0.5%, and the bonding strength is more than 65 MPa; this enables effective partial etching of the medium (e.g. Cl)2) Can permeate into the base material through narrow gaps in the coating to erode the base material.
Example 2
As shown in fig. 2(a), the coating structure for resisting corrosion of the heating surface of the boiler comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact with each other to form the heating surface; the surface coating consists of a metal oxide coating, the inner coating consists of metal elements, and the components of the adjacent coatings are different.
Specifically, as shown in fig. 2(b), when n is 2, the coating structure is Al in the order from the outside to the inside2O3The coating is coated on the corresponding coating in a thermal spraying mode, and the base material is 10Cr9Mo1VNb steel. The average thickness of the surface layer coating is 1.1mm, the average thickness of the inner layer coating is 1.3mm, the average porosity is 0.3%, and the bonding strength is more than 70 MPa; this effectively prevents partial corrosion of the medium (e.g. Cl)2) By coatingThe medium and small gaps penetrate into the base material to erode the base material.
Relative to other metal oxides, Al2O3Is a metal oxide with strong corrosion resistance, so the present embodiment uses Al2O3As a material for the corrosion-resistant coating of the surface layer. And Ni and Cl2The change of Gibbs free energy of corrosion reaction between corrosion media such as HCl and the like is larger than that of other metal elements (such as Fe, Cr, Al and the like), so that based on the principle of minimum Gibbs free energy, Ni has stronger corrosion resistance than other metal elements; and is filled with O2And Cl2Under the corrosive smoke environment, Ni can react with O2The preferential reaction forms protective NiO instead of Cl2Corrosion, which means that in the case where the surface coating is damaged, the inner coating preferentially forms a protective metal oxide to block the path of the corrosion medium penetrating inward, so Ni is selected as the metal element of the inner coating in this embodiment.
Example 3
A corrosion-resistant coating structure of a boiler heating surface comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact to form a heating surface; the outer coating is Al2O3The inner layer of the coating is of a multilayer structure according to Fe2O3Coating, TiO2The coating sequence is arranged in turn towards the base material (10Cr9Mo1VNb steel); the three layers of coatings are applied to the respective coatings by thermal spraying.
Example 4
A corrosion-resistant coating structure of a boiler heating surface comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact to form a heating surface; the outer coating is SiO2The inner layer coating is a multilayer structure and is made of NiO coating and TiO2The coating sequence is arranged in turn towards the base material (10Cr9Mo1VNb steel); the three layers of coatings are applied to the respective coatings by thermal spraying.
Example 5
A corrosion-resistant coating structure of a boiler heating surface comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and a base material, and the surface coating and the base material are in close contact to form a heating surface; the outer coating is Al2O3The inner layer of the coating is of a multilayer structure according to SiO2Coating, Fe2O3The coating sequence is arranged in turn towards the base material (10Cr9Mo1VNb steel); the three layers of coatings are applied to the respective coatings by thermal spraying.
Example 6
A boiler heating surface anticorrosion coating structure, the coating structure is: the outer coating consists of Cr2O3、NiO、Fe2O3The resulting homogeneous mixture; the inner coating is a multilayer structure, which is formed by coating metal Cr + Ni + Nb (uniform mixture), SiO2Coating, metallic Mo + Mn coating (homogeneous mixture), Cr2O3The coating sequence is arranged in turn towards the base material (10Cr9Mo1VNb steel); the coating is coated on the corresponding coating in a thermal spraying mode.
Example 7
A boiler heating surface anticorrosion coating structure, the coating structure is: the outer coating is made of Al2O3、Cr2O3And NiO is formed into a uniform mixture; the inner layer coating is a multilayer structure and is formed by a metal Cr coating and SiO2Coating, metallic Al coating, Fe2O3The coating sequence is arranged in turn towards the base material (10Cr9Mo1VNb steel); the coating is coated on the corresponding coating in a thermal spraying mode.
Example 8
A boiler heating surface anticorrosion coating structure, the coating structure is: the outer coating is made of Al2O3、Cr2O3And NiO is formed into a uniform mixture; the inner coating is of a single-layer structure and is made of Fe2O3、TiO2、SiO2The formed homogeneous mixture is made of 10Cr9Mo1VNb steel as a base material.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (8)

1. The utility model provides a boiler heating surface anticorrosion coating structure which characterized in that: the coating structure comprises a surface coating and an inner coating, wherein the inner coating is positioned between the surface coating and the base material, and the surface coating and the base material are in close contact to form a heating surface; the surface coating is composed of oxides; the inner layer coating is of a multilayer structure, the multilayer structure is formed by alternately arranging coatings composed of metal oxides and coatings composed of metal elements, and the components of the adjacent coatings are different;
the corrosion resistance of the surface coating oxide is higher than that of the inner coating oxide.
2. The boiler heating surface corrosion-resistant coating structure of claim 1, wherein: the oxide is a single oxide or a mixture of a plurality of oxides.
3. The boiler heating surface anti-corrosion coating structure as recited in any one of claims 1-2, wherein: the oxide comprises Al2O3、Cr2O3、NiO、Fe2O3、TiO2、SiO2One or more of (a).
4. The boiler heating surface corrosion-resistant coating structure of claim 1, wherein: the metal element is a single metal or a mixture of a plurality of metal elements.
5. The boiler heating surface corrosion-resistant coating structure of claim 1, wherein: the metal elements comprise one or more of Cr, Ni, Al, Fe, Mo, Mn and Nb.
6. The boiler heating surface corrosion-resistant coating structure of claim 1, wherein: the metal element is Ni.
7. The boiler heating surface corrosion-resistant coating structure of claim 1, wherein: the thickness of the surface coating and the thickness of the inner coating are both not less than 0.8mm, the porosity is both not greater than 0.5%, and the bonding strength is both not less than 65 MPa.
8. Use of a corrosion resistant coating structure according to claim 1 in boilers, superheaters, reheaters, heat exchanger installations.
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JPH0882499A (en) * 1994-09-12 1996-03-26 Mitsubishi Heavy Ind Ltd Heat resistant corrosion-resistant film
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CN104264102A (en) * 2014-10-15 2015-01-07 西安石油大学 Preparation method of nickel base alloy coating on boiler water wall

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