Anti-falling high-temperature-corrosion-resistant coating and material, and preparation method therefor and use thereof

Abstract

The present application belongs to the technical field of pipeline corrosion. Disclosed are an anti-falling high-temperature-corrosion-resistant coating and material, and a preparation method therefor and the use thereof. In the anti-falling high-temperature-corrosion-resistant coating material disclosed in the present application, V, Ta and Mo are doped into Cr and Al to generate lattice expansion of different degrees, which facilitates improving the phase structure stability of a coating, thereby enhancing the oxidation resistance. In addition, all the elements works synergistically with Cr, thereby improving the thermal stability of the whole structure and significantly improving the oxidation resistance of the coating in a high-temperature steam environment. Moreover, the coating material can form a metallurgically bonded coating on the surface of a substrate, thereby significantly improving the bonding force between the coating and the substrate. When the coating material serves in a high-temperature steam environment, the oxidation resistance thereof can be significantly improved, thereby solving the problem of an existing coating being prone to falling off.

Description

A coating and material for preventing peeling and resisting high temperature corrosion, its preparation method and application

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411586227.9, filed on November 8, 2024, entitled "An anti-shedding and high-temperature corrosion resistant coating and material, preparation method and application", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of pipeline corrosion protection technology, specifically relating to an anti-detachment and high-temperature corrosion resistant coating and material, preparation method and application. Background Technology

[0004] Boiler flow path components, especially those in circulating fluidized bed (CFB) boilers, have seen significant technological advancements in recent years. Large-capacity CFB boilers have achieved cyclic combustion of coal, effectively extending combustion time and improving coal utilization efficiency. Furthermore, the material usage of boiler flow path components, particularly in CFB boilers, can be adjusted, allowing the boiler to maintain stable performance during operation, even under low load conditions. CFB boilers separate high-temperature solid materials from the gas flow and return them to the combustion chamber through the main circulation loop, achieving multiple cycles and repeated combustion of fuel and desulfurizing agent, thereby improving fuel combustion efficiency and desulfurization efficiency. CFB boiler technology not only improves material combustion efficiency but also provides a wide range of fuel options to meet diverse production needs. However, ensuring the performance of boiler flow path components during use remains a key concern.

[0005] Boiler flow passage components are typically used in high-temperature environments, such as 650℃. When the high-temperature steam on the inner wall comes into contact with the metal wall, an oxidation reaction occurs, forming an oxide film. As corrosion continues, the oxide film gradually thickens, reducing the effective thickness of the metal wall and severely affecting the service life of the components. At the same time, when the oxide film reaches a certain thickness, due to the difference in physical properties between the oxide film and the base metal (such as the difference in the coefficient of linear expansion), the oxide film may peel off during boiler start-up and shutdown. The peeled oxides may accumulate in the pipes, such as at the bottom of the U-bend of the vertical pipe panel, causing pipe blockage or overheating and pipe rupture, creating safety hazards.

[0006] Therefore, improving the high-temperature corrosion resistance of the inner wall of boiler flow passage components through coating is crucial. Existing coatings typically involve applying a slurry with some anti-corrosion properties to the inner wall surface to form an anti-corrosion coating. However, when exposed to high-temperature steam corrosion, these coatings are prone to the following problems: The adhesion between the coating and the substrate may decrease due to the corrosive effect of high-temperature steam, leading to coating peeling. Especially during boiler start-up and shutdown, load fluctuations, rapid temperature changes can exacerbate coating peeling. Decreased coating performance renders it unable to effectively resist high-temperature steam erosion, causing coating failure and consequently affecting the performance of the flow passage components themselves. During high-temperature steam corrosion, an oxide film may form on the coating surface. However, when this oxide film reaches a certain thickness or encounters temperature fluctuations, it may peel off. The peeled oxide film may clog pipes, affecting the normal operation of the boiler. Furthermore, the peeled coating material and oxide film may enter the condensate system, becoming deposits in easily scaled areas of thermal equipment. These deposits reduce the thermal efficiency of the equipment, increase energy consumption, and may cause other safety issues. Summary of the Invention

[0007] The purpose of this application is to provide an anti-detachment and high-temperature corrosion resistant coating and material, preparation method and application, to solve the technical problem that existing anti-corrosion coatings are prone to oxidation and detachment in high-temperature steam environments.

[0008] To achieve the above objectives, this application adopts the following technical solution:

[0009] This application discloses an anti-peeling and high-temperature corrosion resistant coating material, wherein the raw materials of the anti-peeling and high-temperature corrosion resistant coating material include, by weight percentage:

[0010] 45%-70% Cr, 3%-15% Fe, 2%-8% Al, 1%-10% V, 4%-8% Ta, 2%-8% Mo, 5.5%-6% La and 3%-6% Ce.

[0011] This application also discloses a method for preparing an anti-peeling and high-temperature corrosion resistant coating, comprising the following steps:

[0012] By mass percentage, 45%-70% Cr, 3%-15% Fe, 2%-8% Al, 1%-10% V, 4%-8% Ta, 2%-8% Mo, 5.5%-6% La and 3%-6% Ce are mixed to obtain a coating material that is resistant to peeling and high-temperature corrosion.

[0013] After pretreatment of the substrate, the substrate is embedded with an anti-detachment and high-temperature corrosion resistant coating material, followed by heat treatment. After heat treatment, an anti-detachment and high-temperature corrosion resistant coating is formed.

[0014] Furthermore, the mixing method is ball milling, and the ball milling time is 12-24 hours.

[0015] Furthermore, the mixture also includes ball milling and drying processes to obtain an anti-peeling and high-temperature corrosion resistant coating material;

[0016] The ball milling time is 6-24 hours; the drying temperature is 80-120℃, and the drying time is 12-24 hours.

[0017] Furthermore, the pretreatment of the substrate includes surface cleaning and preheating in sequence;

[0018] The preheating temperature is 220-250℃, and the time is 30-60 minutes.

[0019] Furthermore, the heat treatment is a high-temperature sintering treatment, which is carried out in an inert atmosphere; the temperature of the high-temperature sintering treatment is 850-1150℃, and the time of the high-temperature sintering treatment is 8-15 minutes.

[0020] This application also discloses an anti-detachment and high-temperature corrosion resistant coating prepared by the above preparation method.

[0021] Furthermore, the anti-detachment and high-temperature corrosion resistant coating is metallurgically bonded to the substrate.

[0022] This application also discloses the application of the above-mentioned anti-detachment and high-temperature corrosion resistant coating in the corrosion protection of the inner wall of boiler flow passage components.

[0023] Furthermore, the material of the boiler flow passage component is austenitic steel or martensitic steel.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] This application discloses an anti-detachment and high-temperature corrosion resistant coating material, which uses V, Ta, and Mo doped into Cr and Al to produce different degrees of lattice expansion, which helps to improve the phase structure stability of the coating and thus enhance its oxidation resistance. Moreover, each element works synergistically with Cr to improve the overall thermal stability of the structure and significantly improve the oxidation resistance of the coating in a high-temperature steam environment. At the same time, this coating material can form a metallurgically bonded coating on the substrate surface, which significantly improves the adhesion between the coating and the substrate. When in service in a high-temperature steam environment, it can significantly improve the oxidation resistance and solve the problem of easy detachment of existing coatings.

[0026] This application also discloses a method for preparing an anti-detachment and high-temperature corrosion resistant coating using the above-mentioned materials. A simple embedding and heating method can be used to form a metallurgically bonded coating on the surface of the substrate. The coating has good adhesion to the substrate and does not change the properties of the substrate itself, and has broad application prospects.

[0027] Furthermore, this method can be applied to the preparation of coatings on the inner walls of irregularly shaped parts, and it is applicable to more scenarios compared to traditional coating methods. Attached Figure Description

[0028] Figure 1 is a cross-sectional schematic diagram of the anti-peeling and high-temperature corrosion resistant coating prepared in this application;

[0029] Figure 2 is a comparison of the high-temperature corrosion resistance of the anti-detachment and anti-high-temperature corrosion coatings prepared in this application;

[0030] Where: a-coated sample; b-uncoated sample;

[0031] Figure 3 shows the corrosion layer thickness data curve of the anti-detachment and high-temperature corrosion resistant coating prepared in this application;

[0032] Figure 4 shows the corrosion cross-section of the anti-detachment and high-temperature corrosion resistant coating prepared in this application in a steam environment;

[0033] Figure 5 shows the corrosion cross-section of the coating prepared in the comparative example in a steam environment. Detailed Implementation

[0034] To enable those skilled in the art to understand the features and effects of this application, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the common meaning understood by those skilled in the art in connection with this application, and in the event of any conflict, the definitions in this specification shall prevail.

[0035] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of this application, meaning that the content of this invention can be implemented without being limited by any particular theory or mechanism.

[0036] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0037] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0038] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0039] The first aspect of this application provides a coating material that is resistant to peeling and high-temperature corrosion, wherein the raw materials, by weight percentage, include 45%-70% Cr, 3%-15% Fe, 2%-8% Al, 1%-10% V, 4%-8% Ta, 2%-8% Mo, 5.5-6% La and 3-6% Ce.

[0040] In the above raw materials, V, Ta, and Mo are doped into Cr and Al, resulting in lattice expansion to varying degrees, which helps to improve the phase structure stability of the coating and thus enhance its antioxidant properties. At the same time, each element works synergistically with Cr to improve the overall thermal stability of the structure. All of the above effects significantly improve the adhesion between the coating and the substrate. When the coating is used in a high-temperature steam environment, it can significantly improve the antioxidant properties and solve the problem of easy peeling off of existing coatings.

[0041] The second aspect of this application provides a method for preparing an anti-stripping and anti-high-temperature corrosion coating using the above-mentioned anti-stripping and anti-high-temperature corrosion coating material, which mainly includes the following steps:

[0042] Weigh and mix the raw materials to obtain a coating material that is resistant to peeling and high-temperature corrosion.

[0043] After pretreatment of the substrate, the substrate is embedded with an anti-detachment and high-temperature corrosion resistant coating material, followed by heat treatment. After heat treatment, an anti-detachment and high-temperature corrosion resistant coating is formed that is metallurgically bonded to the substrate.

[0044] Optionally, the mixing method is ball milling, and the ball milling time is 12-24 hours.

[0045] Optionally, the mixture may also undergo ball milling and drying to obtain a coating material that is resistant to peeling and high-temperature corrosion.

[0046] The ball milling time is 6-24 hours; the drying temperature is 80-120℃, and the drying time is 12-24 hours.

[0047] Optionally, the pretreatment of the substrate includes surface cleaning and preheating in sequence;

[0048] The preheating temperature is 220-250℃, and the time is 30-60 minutes.

[0049] Optionally, the heat treatment is a high-temperature sintering treatment, which is carried out in an inert atmosphere; the temperature of the high-temperature sintering treatment is 850-1150℃; and the time of the high-temperature sintering treatment is 8-15 minutes.

[0050] Using the above preparation method, a coating that is metallurgically bonded to the substrate and resists high-temperature corrosion can be obtained. Moreover, this method can achieve the preparation of anti-corrosion coatings for irregularly shaped parts that cannot be achieved by traditional coating methods.

[0051] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Furthermore, it should be understood that after reading the teachings of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope defined by the appended claims.

[0052] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0053] Example 1

[0054] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0055] Step 1: Weigh 45% Cr, 15% Fe, 5% Al, 10% V, 5% Ta, 8% Mo, 6% La and 6% Ce according to the mass percentage, ball mill them for 12 hours, then ball mill for 24 hours, and then dry them at 80℃ for 24 hours to obtain the anti-peeling and high temperature corrosion resistant coating material.

[0056] Step 2: After rinsing the TP347HFG substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 220℃ for 30 minutes.

[0057] Step 3: Embed the TP347HFG substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 980℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347HFG substrate and is metallurgically bonded to it.

[0058] Example 2

[0059] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0060] Step 1: Weigh 69.5% Cr, 3% Fe, 8% Al, 1% V, 8% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill them for 20 hours, then ball mill them for 12 hours, and then dry them at 100℃ for 20 hours to obtain the anti-peeling and high-temperature corrosion resistant coating material.

[0061] Step 2: After rinsing the HR3C substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 220℃ for 60 minutes.

[0062] Step 3: Embed the HR3C substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 850°C for 15 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the HR3C substrate and is metallurgically bonded to it.

[0063] Example 3

[0064] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0065] Step 1: Weigh out 50% Cr, 15% Fe, 2% Al, 10% V, 8% Ta, 6.5% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill and mix for 24 hours, then ball mill for 6 hours, and then dry at 120℃ for 12 hours to obtain a coating material that is resistant to peeling and high temperature corrosion.

[0066] Step 2: After rinsing the TP347H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 250℃ for 40 minutes.

[0067] Step 3: Embed the TP347H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1000℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347H substrate and is metallurgically bonded to it.

[0068] Example 4

[0069] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0070] Step 1: Weigh 70% Cr, 3% Fe, 2.5% Al, 10% V, 4% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill them together for 24 hours, then ball mill for 6 hours, and then dry them at 120℃ for 12 hours to obtain the anti-peeling and high-temperature corrosion resistant coating material.

[0071] Step 2: After rinsing the Super304H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 230℃ for 40 minutes.

[0072] Step 3: Embed the Super304H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1150℃ for 15 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the Super304H substrate and is metallurgically bonded to it.

[0073] Example 5

[0074] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0075] Step 1: Weigh 70% Cr, 3% Fe, 2.5% Al, 10% V, 4% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill them together for 24 hours, then ball mill for 6 hours, and then dry them at 120℃ for 12 hours to obtain the anti-peeling and high-temperature corrosion resistant coating material.

[0076] Step 2: After rinsing the Super304H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 230℃ for 40 minutes.

[0077] Step 3: Embed the Super304H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 900℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the Super304H substrate and is metallurgically bonded to it.

[0078] Example 6

[0079] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0080] Step 1: Weigh out 60% Cr, 13% Fe, 2.5% Al, 10% V, 4% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill and mix for 24 hours, then ball mill for 6 hours, and then dry at 120℃ for 12 hours to obtain a coating material that is resistant to peeling and high temperature corrosion.

[0081] Step 2: After rinsing the Super304H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 230℃ for 40 minutes.

[0082] Step 3: Embed the Super304H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 900℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the Super304H substrate and is metallurgically bonded to it.

[0083] Example 7

[0084] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0085] Step 1: Weigh out 63% Cr, 10% Fe, 2.5% Al, 6% V, 8% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill and mix for 24 hours, then ball mill for 6 hours, and then dry at 120℃ for 12 hours to obtain a coating material that is resistant to peeling and high temperature corrosion.

[0086] Step 2: After rinsing the TP347H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 250℃ for 40 minutes.

[0087] Step 3: Embed the TP347H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1000℃ for 8 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347H substrate and is metallurgically bonded to it.

[0088] Example 8

[0089] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0090] Step 1: Weigh out 63% Cr, 10% Fe, 2.5% Al, 6% V, 8% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill them together for 24 hours, then ball mill for 6 hours, and then dry them at 110℃ for 24 hours to obtain the anti-peeling and high-temperature corrosion resistant coating material.

[0091] Step 2: After rinsing the TP347H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 250℃ for 40 minutes.

[0092] Step 3: Embed the TP347H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1000℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347H substrate and is metallurgically bonded to it.

[0093] Example 9

[0094] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0095] Step 1: Weigh out 63% Cr, 10% Fe, 2.5% Al, 6% V, 8% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill and mix for 24 hours, then ball mill for 6 hours, and then dry at 120℃ for 12 hours to obtain a coating material that is resistant to peeling and high temperature corrosion.

[0096] Step 2: After rinsing the TP347H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 240℃ for 50 minutes.

[0097] Step 3: Embed the TP347H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1000℃ for 10 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347H substrate and is metallurgically bonded to it.

[0098] Example 10

[0099] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0100] Step 1: Weigh out 60% Cr, 13% Fe, 2.5% Al, 10% V, 4% Ta, 2% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill them together for 12 hours, then ball mill for 10 hours, and then dry them at 120℃ for 12 hours to obtain the anti-peeling and high-temperature corrosion resistant coating material.

[0101] Step 2: After rinsing the Super304H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 230℃ for 40 minutes.

[0102] Step 3: Embed Super304H substrate with anti-detachment and high-temperature corrosion resistant coating material, and sinter at 860℃ for 8 minutes under an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of Super304H substrate and is metallurgically bonded to it.

[0103] Example 11

[0104] A method for preparing an anti-peeling and high-temperature corrosion resistant coating includes the following steps:

[0105] Step 1: Weigh out 50% Cr, 15% Fe, 2% Al, 10% V, 8% Ta, 6.5% Mo, 5.5% La and 3% Ce according to the mass percentage, ball mill and mix for 24 hours, then ball mill for 6 hours, and then dry at 120℃ for 12 hours to obtain a coating material that is resistant to peeling and high temperature corrosion.

[0106] Step 2: After rinsing the TP347H substrate with a high-pressure water gun, rinse it with alcohol and preheat it at 250℃ for 60 minutes.

[0107] Step 3: Embed the TP347H substrate with an anti-detachment and high-temperature corrosion resistant coating material, and sinter it at 1130℃ for 12 minutes in an inert atmosphere. After the high-temperature sintering treatment, an anti-detachment and high-temperature corrosion resistant coating is formed on the surface of the TP347H substrate and is metallurgically bonded to it.

[0108] Comparative Example

[0109] Unlike Example 1, the coating material in the comparative example consisted of 60% high-carbon ferrochrome, 38% Al2O3 and 2% NH4Cl by mass percentage. The high-temperature sintering temperature and time were 950°C and 4h, respectively. The remaining steps were the same as in Example 1, and a coating with a thickness of 39.12 μm was prepared.

[0110] Figure 1 shows a cross-sectional view of the anti-detachment and high-temperature corrosion resistant coating prepared in Example 1 of this application. It can be seen that the anti-detachment and high-temperature corrosion resistant coating forms a metallurgical bond with the substrate material and has a double-layer structure.

[0111] Figure 2 shows a comparison of the corrosion layer cross-sections of the anti-detachment, high-temperature corrosion resistant coating and the uncoated base material sample prepared in Example 2 of this application. Figure 3 shows a comparison curve of the corrosion layer thickness data of the anti-detachment, high-temperature corrosion resistant coating and the uncoated base material sample prepared in Example 2 of this application. It can be seen that after 1000 hours of corrosion in a high-temperature pure water vapor environment at 650℃, the corrosion layer thickness on the surface of the coated sample is approximately 3.19 μm, and the corrosion layer thickness on the surface of the uncoated sample is approximately 43.24 μm. The calculated average corrosion rates for the coated and uncoated samples are 3.4 × 10⁻⁶ and 3.4 × 10⁻⁶, respectively. -5 mg / (cm 2 ·h) and 2.3×10 -3 mg / (cm 2 In terms of magnitude, the coating sample's resistance to high-temperature corrosion is improved by about two orders of magnitude compared to the uncoated sample, and its resistance to high-temperature steam oxidation is significantly improved.

[0112] Figure 4 shows a cross-sectional view of the anti-detachment and high-temperature corrosion resistant coating prepared in Example 4 after 1000 hours of corrosion in a steam environment at 650℃. It can be seen that the coating structure remains intact after corrosion, with no detachment or peeling. Only nanometer-wide microcracks appear on the surface, and these microcracks are filled with dense oxide, preventing further crack propagation. The thickness of the corrosion layer on the coating surface is approximately 1.36 μm, and the calculated average corrosion rate is 1.3 × 10⁻⁶. -5 mg / (cm 2 •h) has excellent corrosion resistance.

[0113] Figure 5 shows a cross-sectional view of the coating prepared in the comparative example after corrosion in a steam environment at 650℃ for 1000h. It can be seen that after corrosion, the coating showed large-area peeling and many obvious cracks. The coating is brittle, easy to crack, and has poor metallurgical bonding strength.

[0114] Table 1 below shows the performance test data of the coatings of Examples 1-11 and the comparative examples of this application under 1000h corrosion in a steam environment at 650℃.

[0115] Table 1. Performance test data of the coatings prepared in each example under 1000h corrosion in a steam environment at 650℃.

[0116] By comparing and analyzing the data in Figures 1-5 and Table 1, the coating material of this application can form a metallurgically bonded coating on the substrate surface, which significantly improves the adhesion between the coating and the substrate. When in service in a high-temperature steam environment, it can significantly improve the oxidation resistance and effectively solve the problem of easy peeling of existing coatings.

[0117] The above content is only for illustrating the technical concept of this application and should not be used to limit the scope of protection of this application. Any modifications made to the technical solution based on the technical concept proposed in this application shall fall within the scope of protection of the claims of this application.

Claims

1. A coating material that prevents peeling and resists high-temperature corrosion, characterized in that, The raw materials of the anti-peeling and high-temperature corrosion resistant coating material, by weight percentage, include: 45%-70% Cr, 3%-15% Fe, 2%-8% Al, 1%-10% V, 4%-8% Ta, 2%-8% Mo, 5.5%-6% La and 3%-6% Ce.

2. A method for preparing an anti-peeling and high-temperature corrosion resistant coating, characterized in that, Includes the following steps: By mass percentage, 45%-70% Cr, 3%-15% Fe, 2%-8% Al, 1%-10% V, 4%-8% Ta, 2%-8% Mo, 5.5%-6% La and 3%-6% Ce are mixed to obtain a coating material that is resistant to peeling and high-temperature corrosion. After pretreatment of the substrate, the substrate is embedded with an anti-detachment and high-temperature corrosion resistant coating material, followed by heat treatment. After heat treatment, an anti-detachment and high-temperature corrosion resistant coating is formed.

3. The method for preparing an anti-peeling and high-temperature corrosion resistant coating according to claim 2, characterized in that, The mixing method is ball milling, and the ball milling time is 12-24 hours.

4. The method for preparing an anti-peeling and high-temperature corrosion resistant coating according to claim 2, characterized in that, The mixture also includes ball milling and drying processes to obtain a coating material that is resistant to peeling and high-temperature corrosion. The ball milling time is 6-24 hours; the drying temperature is 80-120℃, and the drying time is 12-24 hours.

5. The method for preparing an anti-peeling and high-temperature corrosion resistant coating according to claim 2, characterized in that, The pretreatment of the substrate includes surface cleaning and preheating in sequence; The preheating temperature is 220-250℃, and the time is 30-60 minutes.

6. The method for preparing an anti-peeling and high-temperature corrosion resistant coating according to claim 2, characterized in that, The heat treatment is a high-temperature sintering treatment, which is carried out in an inert atmosphere; the temperature of the high-temperature sintering treatment is 850-1150℃, and the time of the high-temperature sintering treatment is 8-15 minutes.

7. A coating that prevents peeling and resists high-temperature corrosion, characterized in that, It is prepared by the preparation method described in any one of claims 2 to 6.

8. The anti-peeling and high-temperature corrosion resistant coating according to claim 7, characterized in that, The anti-detachment and high-temperature corrosion resistant coating is metallurgically bonded to the substrate.

9. The application of the anti-detachment and high-temperature corrosion resistant coating as described in claim 7 in the corrosion protection of the inner wall of boiler flow passage components.

10. The application of the anti-detachment and high-temperature corrosion resistant coating according to claim 9 in the corrosion protection of the inner wall of boiler flow passage components, characterized in that, The boiler flow passage components are made of austenitic steel or martensitic steel.

Images