An element-modified aluminide cladding coating and a method of making the same

Abstract

The application provides an element modified aluminide cladding coating and a preparation method thereof, and the preparation method comprises the following steps: stirring, ball milling, and drying 50-80% of FeAl, 10-35% of Al, 2-5% of La2O3, 3-6% of Pt, 3-6% of Hf, and 1-5% of NH4Cl according to the mass percentage of solid phase components; performing surface cleaning treatment on a workpiece to be plated for standby, pouring sufficient cladding powder into a feeding port of an ion cladding device; placing the workpiece to be plated in an inert atmosphere, and performing plasma cladding on the workpiece to be plated by using the ion cladding device, so that the aluminide cladding coating is obtained after cooling; and performing treatment on cladding residues. One technical effect of the application is that the application can not only provide a channel for Al elements, form a dense oxide, effectively inhibit internal oxidation and internal sulfuration, and improve the heat corrosion resistance of the coating, but also can gather at the oxide grain boundary, hinder the further oxidation of the base material, and further improve the oxidation resistance of the coating.

Description

Technical Field

[0001] This invention belongs to the field of material surface alloying and coating preparation technology, specifically relating to an element-modified aluminum compound cladding coating and its preparation method. Background Technology

[0002] In the thermal power generation industry, oxidation and corrosion of the inner wall of flow pipes are major factors leading to boiler outages, increasing the unit's operating and material costs by more than 20%. Therefore, researching and developing anti-oxidation technologies suitable for the inner wall surfaces of pipes used in boiler units is of great practical significance.

[0003] Studies have shown that aluminide coatings are effective in addressing oxidation corrosion, wear, and high-temperature ablation of pipe inner walls. However, with the increase in generator power and the extension of service life, single aluminide coatings face the problem of insufficient oxidation resistance. Therefore, there is a need to develop a new type of aluminide anti-oxidation coating with better service performance suitable for workpieces with complex shapes, such as those with large length-to-diameter ratios, and its preparation process. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art, and to provide a new technical solution for element-modified aluminum cladding coating and its preparation method.

[0005] According to a first aspect of the invention, a method is provided

[0006] According to a first aspect of the present invention, a method for preparing an element-modified aluminide cladding coating is provided, comprising the following steps:

[0007] Step S1, the solid phase component is prepared by mixing 50-80% FeAl and 10-...

[0008] 35% Al, 2-5% La2O3, 3-6% Pt, 3-6% Hf, and 1-5% NH4Cl were stirred, ball-milled, and dried to prepare cladding powder; wherein the sum of the mass percentages of each component is 100%.

[0009] Step S2: Clean the surface of the workpiece to be plated and set it aside. Pour a sufficient amount of cladding powder into the feed port of the ion cladding device.

[0010] Step S3: Place the workpiece to be plated in an inert atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece to perform plasma cladding. After cooling, an aluminum cladding coating is obtained.

[0011] Step S4: Treat the cladding residue.

[0012] Optionally, in step S1, FeAl, Al, Pt, and Hf are all in powder form, and FeAl, Al, Pt, and Hf are all sieved through a 1000-mesh sieve.

[0013] Optionally, in step S1, the cladding powder is obtained by wet milling the solid phase component using a planetary ball mill and then drying it.

[0014] Optionally, when wet milling solid components in a planetary ball mill, the wet milling medium is anhydrous ethanol, the ball milling speed is 350-400 rpm, the time is 12-24 h, and the drying conditions are vacuum drying at 80-120℃ for 12-24 h.

[0015] Optionally, the process parameters for plasma cladding are as follows:

[0016] The cladding current is 80–120 A, the feed rate is 18–22 g / min, the scanning rate is 20–40 cm / min, the nozzle height is 8–12 mm, the rotation speed is 2–5 r / min, the ion gas flow rate is 0.2–0.3 L / min, and the protective gas flow rate is 18–20 L / min.

[0017] Optionally, the inert gas in the inert atmosphere is Ar or N2.

[0018] Optionally, in step S2, the surface of the workpiece to be plated is cleaned with a high-pressure water gun for 5 minutes and then rinsed with alcohol or acetone.

[0019] Optionally, the cladding residue is treated, including:

[0020] Use a high-pressure water gun to rinse off the cladding residue on the surface of the workpiece, and then let it air dry naturally.

[0021] Optionally, in step S3, the thickness of the aluminide cladding coating is 0.94 to 2.35 mm.

[0022] According to a second aspect of the present invention, an element-modified aluminide cladding coating is provided, prepared by the preparation method described in the first aspect, comprising a solid phase component, said solid phase component comprising the following components in mass percentage:

[0023] 50–80% FeAl, 10–35% Al, 2–5% La2O3, 3–6% Pt, 3–6% Hf, and 1–5% NH4Cl; wherein the sum of the mass percentages is 100%.

[0024] One technical advantage of this invention is that:

[0025] In this embodiment, the method for preparing the element-modified aluminide cladding coating employs a plasma cladding process. Plasma cladding offers advantages such as concentrated heat, short processing time, and minimal heat-affected zone in the cladding area, resulting in high bonding strength between the aluminide cladding coating and the base material. Furthermore, this rare-earth element-modified aluminide cladding coating is prepared using an integrated production line, which not only ensures high production efficiency and controllable thickness but also high process repeatability and strong practicality.

[0026] In addition, by adding La2O3 and NH4Cl to the cladding powder components, the effects of catalytic penetration and activation are achieved, which significantly improves the penetration rate and coating quality. By introducing Pt and Hf co-modified aluminide coatings, the oxide products can be generated to pin the oxide film of the coating, thereby simultaneously improving the oxidation resistance and heat corrosion resistance of the base material.

[0027] Furthermore, the addition of rare earth oxides, based on the diffusion-promoting effect of halides, can pin grain boundaries, refine the matrix structure, improve surface hardness, and enhance the bonding strength between the coating and the substrate in the form of second-phase precipitation. Simultaneously, the introduction of Pt element modification can provide channels for Al elements, forming dense oxides, inhibiting or reducing the outward diffusion of alloying elements, accelerating the transformation from θ-Al₂O₃ to α-Al₂O₃, improving film-substrate adhesion, effectively inhibiting internal oxidation and internal sulfidation, and enhancing the coating's resistance to hot corrosion. Moreover, the introduction of Hf element modification can aggregate at oxide grain boundaries, hindering further oxidation of the substrate; its oxidation product, HfO₂, can pin the oxide film, enhancing the oxide's anti-stripping properties, thereby improving the coating's oxidation resistance and overall oxidation resistance. Attached Figure Description

[0028] Figure 1 This invention relates to a method for preparing an element-modified aluminide cladding coating according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the cross-sectional morphology of an aluminide cladding coating according to an embodiment of the present invention. Detailed Implementation

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0031] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] According to a first aspect of the invention, such as Figure 1 As shown, a method for preparing an element-modified aluminide cladding coating is provided, comprising the following steps:

[0036] Step S1: The solid phase components are stirred, ball-milled, and dried according to the following mass percentages: 50-80% FeAl (permeation source), 10-35% Al (permeation source), 2-5% La2O3 (permeation catalyst), 3-6% Pt (modifier), 3-6% Hf (modifier), and 1-5% NH4Cl (catalyst) to prepare cladding powder; wherein the sum of the mass percentages is 100%.

[0037] Step S2: Clean the surface of the workpiece to be plated and set it aside. Pour a sufficient amount of cladding powder into the feed port of the ion cladding device.

[0038] Step S3: Place the workpiece to be plated in an inert atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece to perform plasma cladding. After cooling, an aluminum cladding coating is obtained.

[0039] Step S4: Treat the cladding residue.

[0040] In this embodiment, the method for preparing the element-modified aluminide cladding coating employs a plasma cladding process. Plasma cladding offers advantages such as concentrated heat, short processing time, and minimal heat-affected zone in the cladding area, resulting in high bonding strength between the aluminide cladding coating and the base material. Furthermore, this rare-earth element-modified aluminide cladding coating is prepared using an integrated production line, which not only ensures high production efficiency and controllable thickness but also high process repeatability and strong practicality.

[0041] In addition, by adding La2O3 and NH4Cl to the cladding powder components, the effects of catalytic penetration and activation are achieved, which significantly improves the penetration rate and coating quality. By introducing Pt and Hf co-modified aluminide coatings, the oxide products can be generated to pin the oxide film of the coating, thereby simultaneously improving the oxidation resistance and heat corrosion resistance of the base material.

[0042] Furthermore, the addition of rare earth oxides, based on the diffusion-promoting effect of halides, can pin grain boundaries, refine the matrix structure, improve surface hardness, and enhance the bonding strength between the coating and the substrate in the form of second-phase precipitation. Simultaneously, the introduction of Pt element modification can provide channels for Al elements, forming dense oxides, inhibiting or reducing the outward diffusion of alloying elements, accelerating the transformation from θ-Al₂O₃ to α-Al₂O₃, improving film-substrate adhesion, effectively inhibiting internal oxidation and internal sulfidation, and enhancing the coating's resistance to hot corrosion. Moreover, the introduction of Hf element modification can aggregate at oxide grain boundaries, hindering further oxidation of the substrate; its oxidation product, HfO₂, can pin the oxide film, enhancing the oxide's anti-stripping properties, thereby improving the coating's oxidation resistance and overall oxidation resistance.

[0043] Optionally, in step S1, FeAl, Al, Pt, and Hf are all in powder form, and FeAl, Al, Pt, and Hf are all sieved through a 1000-mesh sieve.

[0044] In the above embodiments, it is helpful to ensure that the components are more uniformly and finely dispersed, and to remove impurities and particles, thereby better ensuring the cladding effect of the aluminide cladding coating.

[0045] Optionally, in step S1, the cladding powder is obtained by wet milling the solid phase component using a planetary ball mill and then drying it.

[0046] In the above embodiments, a cladding powder with fully and uniformly mixed components can be obtained, which helps to better ensure the quality of the aluminide cladding coating during the cladding process.

[0047] Optionally, when wet milling solid components in a planetary ball mill, the wet milling medium is anhydrous ethanol, the ball milling speed is 350-400 rpm, the time is 12-24 h, and the drying conditions are vacuum drying at 80-120℃ for 12-24 h.

[0048] In the above embodiments, wet milling of the solid components is a reasonable method, which helps to ensure the uniformity of the fineness of the cladding powder.

[0049] Optionally, the process parameters for plasma cladding are as follows:

[0050] The cladding current is 80–120 A, the feed rate is 18–22 g / min, the scanning rate is 20–40 cm / min, the nozzle height is 8–12 mm, the rotation speed is 2–5 r / min, the ion gas flow rate is 0.2–0.3 L / min, and the protective gas flow rate is 18–20 L / min.

[0051] In the above embodiments, the parameters of the plasma cladding process are set reasonably, which makes the cladding process have the advantages of concentrated heat, short action time and small heat-affected zone in the cladding area, thereby making the bonding strength between the aluminum compound cladding coating and the base material high.

[0052] Optionally, the inert gas in the inert atmosphere is Ar or N2. Using chemically stable Ar or N2 to provide an inert atmosphere helps to ensure that the workpiece to be plated is not oxidized during the cladding process.

[0053] Optionally, in step S2, the surface of the workpiece to be plated is cleaned with a high-pressure water gun for 5 minutes and then rinsed with alcohol or acetone.

[0054] In the above embodiments, oil stains, dirt and other contaminants on the surface of the workpiece to be plated can be effectively removed and oxide scale can be removed. The surface can be rinsed with alcohol or acetone, providing a clean surface with a metallic luster for subsequent cladding, thereby helping to ensure the strength and stability of the bond between the workpiece surface and the aluminide cladding coating.

[0055] Optionally, the cladding residue is treated, including:

[0056] Use a high-pressure water gun to rinse off the cladding residue on the surface of the workpiece, and then let it air dry naturally.

[0057] In the above embodiments, cladding residue can be thoroughly treated, ensuring the cleanliness of the workpiece surface.

[0058] Optionally, in step S3, the thickness of the aluminide cladding coating is 0.94–2.35 mm. This results in good metallurgical bonding properties of the aluminide cladding coating, leading to high bonding strength between the aluminide cladding coating and the base material.

[0059] According to a second aspect of the present invention, an element-modified aluminide cladding coating is provided, prepared by the preparation method described in the first aspect, comprising a solid phase component, said solid phase component comprising the following components in mass percentage:

[0060] 50–80% FeAl, 10–35% Al, 2–5% La2O3, 3–6% Pt, 3–6% Hf, and 1–5% NH4Cl; wherein the sum of the mass percentages is 100%.

[0061] In the above embodiments, by adding La2O3 and NH4Cl to the cladding powder components, the effects of catalytic penetration and activation are achieved, significantly improving the penetration rate and coating quality; by introducing Pt and Hf co-modified aluminide coating, an oxide product pinning coating oxide film can be generated, simultaneously improving the oxidation resistance and heat corrosion resistance of the base material.

[0062] Furthermore, the addition of rare earth oxides, based on the halide-promoted diffusion, can pin grain boundaries, refine the matrix structure, improve surface hardness, and enhance the bonding strength between the coating and the substrate through second-phase precipitation. Simultaneously, the introduction of Pt modification provides channels for Al elements, forming dense oxides, inhibiting or reducing the outward diffusion of alloying elements, accelerating the transformation from θ-Al₂O₃ to α-Al₂O₃, improving film-substrate adhesion, effectively inhibiting internal oxidation and sulfidation, and enhancing the coating's resistance to thermal corrosion. Moreover, the introduction of Hf modification allows for aggregation at oxide grain boundaries, hindering further oxidation of the substrate; its oxidation product, HfO₂, can pin the oxide film, enhancing the oxide's anti-stripping properties, thereby improving the coating's oxidation resistance.

[0063] In the embodiments of this application, the element-modified aluminide cladding coating and its preparation method, under the condition of adjusting the main process parameters such as the composition of the cladding powder and the plasma cladding parameters, produce an aluminide cladding coating with a thickness of 0.94-2.35 mm and good metallurgical bonding. The aluminide cladding coating obtained by the present invention has an oxidation resistance 20-64 times higher than the base material in a 600℃ pure water vapor environment, and an oxidation resistance 24-74 times higher than the base material in a 650℃ pure water vapor environment. This demonstrates that the aluminide cladding coating prepared by the method of the present invention effectively improves the oxidation resistance of the alloy base material in a water vapor environment.

[0064] Example 1

[0065] Step S1: Weigh each component of the solid phase according to the mass percentage, including 50% FeAl, 35% Al, 2% NH4Cl, 3% La2O3, 5% Pt and 5% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 400 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0066] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0067] Step 3: Place the workpiece to be plated in an inert atmosphere of Ar or N2, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are as follows: cladding current 120A, feed rate 18g / min, scanning rate 25cm / min, nozzle height 10mm, rotation speed 2r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0068] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0069] Examples 2-11

[0070] The cladding process of Examples 2-11 is the same as that of Example 1. Examples 1-11 maintain the same infiltrator composition ratio. The specific conditions are detailed in Table 1. Table 1 shows the specific parameters of the preparation method of element-modified aluminide cladding coating in Examples 1-11. By following the preparation steps in Example 1 and the specific preparation parameters in the table, aluminide cladding coatings of different thicknesses can be obtained.

[0071] Table 1

[0072]

[0073] Through analysis and research of the above embodiments, the thickness of the cladding layer was measured to be approximately 0.94–2.35 mm. Specific results are shown in Table 1. The cross-sectional morphology of the cladding coating prepared in Example 1 is as follows: Figure 2 As shown in Table 1 and the cross-sectional morphology, the diffusion layer has a uniform structure, moderate thickness, and sufficient Al atom diffusion. The diffusion layer and the matrix have a good metallurgical bond and are not easy to fall off.

[0074] Example 12

[0075] Step S1: Weigh each component of the solid phase according to the mass percentage, including 80% FeAl, 10% Al, 1% NH4Cl, 3% La2O3, 3% Pt and 3% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 350 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0076] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0077] Step 3: Place the workpiece to be plated in an inert atmosphere of Ar or N2, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are: cladding current 80A, feed rate 20g / min, scanning rate 40m / min, nozzle height 12mm, rotation speed 3r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0078] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0079] Example 13

[0080] Step S1: Weigh each component of the solid phase according to the mass percentage, including 60% FeAl, 25% Al, 2% NH4Cl, 3% La2O3, 5% Pt and 5% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 400 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0081] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0082] Step 3: Place the workpiece to be plated in an inert Ar atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are: cladding current 100A, feed rate 18g / min, scanning rate 35m / min, nozzle height 10mm, rotation speed 3r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0083] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0084] Example 14

[0085] Step S1: Weigh each component of the solid phase according to the mass percentage, including 70% FeAl, 15% Al, 2% NH4Cl, 3% La2O3, 5% Pt and 5% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 400 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0086] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0087] Step 3: Place the workpiece to be plated in an inert Ar atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are: cladding current 120A, feed rate 20g / min, scanning rate 35m / min, nozzle height 10mm, rotation speed 2r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0088] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0089] Example 15

[0090] Step S1: Weigh each component of the solid phase according to mass percentage, including 65% FeAl, 16% Al, 5% NH4Cl, 5% La2O3, 6% Pt and 3% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 400 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0091] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0092] Step 3: Place the workpiece to be plated in an inert Ar atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are: cladding current 120A, feed rate 20g / min, scanning rate 35m / min, nozzle height 10mm, rotation speed 2r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0093] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0094] Example 16

[0095] Step S1: Weigh each component of the solid phase according to mass percentage, including 65% FeAl, 16% Al, 5% NH4Cl, 5% La2O3, 3% Pt and 6% Hf; place them in a planetary ball mill for wet milling, wherein the wet milling medium is anhydrous ethanol, the ball milling speed is 400 rpm and the time is 24 h, and then vacuum dry at 100℃ for 24 h to obtain clad powder.

[0096] Step 2: Clean the surface of the workpiece to be plated with a high-pressure water gun for 5 minutes, and then rinse it with alcohol or acetone.

[0097] Step 3: Place the workpiece to be plated in an inert Ar atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece for plasma cladding. After cooling, an aluminum oxide cladding coating with anti-oxidation properties is obtained. The plasma cladding process parameters are: cladding current 120A, feed rate 20g / min, scanning rate 35m / min, nozzle height 10mm, rotation speed 2r / min, ion gas flow rate 0.2L / min, and protective gas flow rate 19L / min.

[0098] Step S4: After the cladding is completed, rinse the surface of the workpiece with a high-pressure water gun or high-pressure airflow to remove any residue, and then allow it to air dry naturally.

[0099] In the embodiments of this application, the aluminum cladding coating prepared by the method of preparing the element-modified aluminum cladding coating is suitable for austenitic steel and high-temperature alloy parts with large length-to-diameter ratios and various complex shapes, such as large boilers and oil and gas field transportation pipelines. It is not only highly practical, with a high diffusion rate and excellent film-substrate adhesion, but also has excellent industrial mass production benefits.

[0100] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing an element-modified aluminide cladding coating, characterized in that, Includes the following steps: Step S1: The solid phase components are stirred, ball-milled, and dried according to the following mass percentages: 50-80% FeAl, 10-35% Al, 2-5% La2O3, 3-6% Pt, 3-6% Hf, and 1-5% NH4Cl, to prepare cladding powder; wherein the sum of the mass percentages is 100%. Step S2: Clean the surface of the workpiece to be plated and set it aside. Pour a sufficient amount of cladding powder into the feed port of the ion cladding device. Step S3: Place the workpiece to be plated in an inert atmosphere, and use an ion cladding device to spray cladding powder onto the surface of the workpiece to perform plasma cladding. After cooling, an aluminum cladding coating is obtained. Step S4: Treat the cladding residue; The process parameters for plasma cladding are as follows: The cladding current is 80–120 A, the feed rate is 18–22 g / min, the scanning rate is 20–40 cm / min, the nozzle height is 8–12 mm, the rotation speed is 2–5 r / min, the ion gas flow rate is 0.2–0.3 L / min, and the protective gas flow rate is 18–20 L / min. The thickness of the aluminide cladding coating is 0.94–2.35 mm.

2. The method for preparing the element-modified aluminide cladding coating according to claim 1, characterized in that, In step S1, FeAl, Al, Pt, and Hf are all in powder form, and all FeAl, Al, Pt, and Hf are sieved through a 1000-mesh sieve.

3. The method for preparing the element-modified aluminide cladding coating according to claim 1, characterized in that, In step S1, the cladding powder is obtained by wet milling the solid components using a planetary ball mill and then drying them.

4. The method for preparing the element-modified aluminide cladding coating according to claim 3, characterized in that, When wet milling solid components in a planetary ball mill, the wet milling medium is anhydrous ethanol, the ball milling speed is 350-400 rpm, the time is 12-24 h, and the drying conditions are vacuum drying at 80-120℃ for 12-24 h.

5. The method for preparing the element-modified aluminide cladding coating according to claim 1, characterized in that, The inert gas in the inert atmosphere is Ar or N2.

6. The method for preparing the element-modified aluminide cladding coating according to claim 1, characterized in that, In step S2, the surface of the workpiece to be plated is cleaned with a high-pressure water gun for 5 minutes and then rinsed with alcohol or acetone.

7. The method for preparing the element-modified aluminide cladding coating according to claim 1, characterized in that, Treatment of cladding residue includes: Use a high-pressure water gun to rinse off the cladding residue on the surface of the workpiece, and then let it air dry naturally.

8. An element-modified aluminide cladding coating, characterized in that, Prepared by the preparation method according to any one of claims 1 to 7, comprising a solid phase component, wherein the solid phase component comprises the following components by mass percentage: 50–80% FeAl, 10–35% Al, 2–5% La2O3, 3–6% Pt, 3–6% Hf, and 1–5% NH4Cl; wherein the sum of the mass percentages is 100%.

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