An integrated preparation method of a high-compactness nickel-based alloy surface high-temperature corrosion-resistant coating

Abstract

The application relates to the technical field of metal coating preparation, in particular to an integrated preparation method of a high-densification nickel-based alloy surface high-temperature corrosion-resistant coating. Inconel 718 powder is used as raw material, a nickel-based component is printed on a substrate, and then AlSi10Mg powder is used as raw material to print an AlSi10Mg layer on the obtained printed nickel-based component; a printed product is obtained. The printed product is sequentially subjected to two heat treatments, and a product is obtained; the first heat treatment is solid solution treatment at a temperature of 1050-1150 DEG C, and the second heat treatment is aging treatment at a temperature of 700-750 DEG C. The obtained product has excellent heat corrosion resistance, the preparation method is simple and controllable, and the product is convenient for industrial application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal coating preparation, and more particularly to an integrated preparation method of a high-densification nickel-based alloy surface high-temperature corrosion-resistant coating. BACKGROUND

[0002] Inconel718 alloy is a niobium-modified nickel-based austenitic superalloy, which has been widely used in gas turbines and other high-temperature components due to its excellent strength and high-temperature oxidation resistance. However, when preparing high-temperature alloy components with extremely complex structure, traditional preparation methods such as investment casting have problems such as great manufacturing difficulty, low component quality, and low product qualification rate. In addition, gas turbines are usually served in a high-temperature salt mist environment, and elements such as Na, Cl, V, and S in the salt mist can form salt pollutants such as Na2SO4 (melting point 884℃), NaVO3 (melting point 600℃), and NaCl (melting point 801℃) during combustion. These generated salt pollutants can destroy the oxide layer on the surface of the nickel-based alloy component, reducing its high-temperature oxidation resistance and shortening its service life. With the continuous development of modern technology, the service environment of modern gas turbines has also become very harsh. In some extreme service environments, the nickel-based alloy components are difficult to repair / replace in time. Therefore, how to quickly prepare high-temperature components while improving their heat corrosion resistance has become a problem to be solved in the application of nickel-based alloys in gas turbines.

[0003] Nickel aluminide can form a dense and continuous alumina scale during high-temperature service, thereby effectively protecting the gas turbine components from oxidation and corrosion up to 1100℃. Therefore, β-NiAl is a protective coating commonly used to improve the heat corrosion resistance of nickel-based alloys. The methods commonly used to manufacture β-NiAl protective coating include electrodeposition, electron beam physical vapor deposition, chemical vapor deposition, slurry spraying, etc. However, the existing methods all have defects such as high impurity content, thin and loose protective coating, high cost, long processing cycle, etc. Therefore, seeking an efficient method to prepare durable, thick, high-quality, and low-cost β-NiAl coating is the primary problem to ensure the long-term stable service of nickel-based alloy gas turbines.

[0004] Laser melting deposition technology can realize the heterogeneous connection of two different materials and is a new type of coating preparation technology. Therefore, the present application selects low-cost AlSi10Mg as the reinforcing coating raw material, uses laser melting deposition technology to prepare the corresponding coating, and uses a two-step heat treatment method to realize the preparation of high-densification NiAl coating, thereby effectively improving the high-temperature corrosion resistance of the nickel-based alloy component. SUMMARY

[0005] In view of the problems of difficult preparation and poor heat corrosion resistance of existing nickel-based superalloy complex components, the application first proposes to first prepare Inconel718 alloy by using laser melting deposition (LMD) technology, and then immediately prepare AlSi10Mg coating on the surface of the Inconel718 alloy by using the same or similar process parameters; and cooperate with the subsequent heat treatment process to further improve the heat resistance and corrosion resistance of the product.

[0006] The preparation process of the application is simple and easy to adjust.

[0007] The technical scheme adopted by the application includes a heat treatment scheme, which solves the problems of pores and cracks that are easily generated by laser melting deposition of two heterogeneous materials.

[0008] The application relates to an integrated preparation method of a high-densification nickel-based superalloy surface heat corrosion resistant coating, which comprises the following steps:

[0009] Step one

[0010] Inconel718 powder is used as raw material, a nickel-based component is first printed on a substrate, and then an AlSi10Mg coating is printed on the set area of the obtained nickel-based component in the same printing equipment; when printing and preparing the nickel-based component, the laser power is 500-800W, the scanning speed is 300-600mm / min, the scanning interval is 0.6-1.2mm, the spot diameter is 1-2mm, the interlayer angle is 90°, the powder feeding amount is 7-10g / min, and the powder carrying gas flow is 8-12L / min.

[0011] When printing and preparing the AlSi10Mg coating, AlSi10Mg powder is used as raw material, and the laser power is controlled to be 500-800W, the scanning speed is controlled to be 300-600mm / min, the scanning interval is controlled to be 0.6-1.2mm, the spot diameter is controlled to be 1-2mm, the interlayer angle is controlled to be 90°, the powder feeding amount is controlled to be 7-10g / min, and the powder carrying gas flow is controlled to be 8-12L / min.

[0012] The printing process is carried out in an argon protective atmosphere.

[0013] Step two

[0014] The obtained product is obtained by sequentially performing twice heat treatment on the obtained product of step one.

[0015] The temperature of the solid solution treatment is 1000-1150℃, preferably 1050-1150℃, and further preferably 1100℃, heat treatment is carried out, heat preservation is 1-1.5h, preferably 1.2h, and aging treatment is carried out after the solid solution treatment,

[0016] The temperature of the aging treatment is 700-750℃, preferably 720℃, and the heat preservation time is 6-8h, preferably 8h.

[0017] As preferred, in the present application, the particle size of the Inconel 718 powder used is 53-150 μm, and the particle size of the AlSi10Mg powder used is 53-150 μm.

[0018] As preferred, the Inconel 718 powder comprises, by mass percentage: Ni 53.83%, Co 0.02%, Cr 18.05%, Mo 3.03%, Ti 1.02%, Nb 5.24%, Al 0.47%, C 0.031%, and Fe balance. Of course, other products modified and / or doped and / or quenched based on the existing Inconel 718 alloy can also be used in the present application.

[0019] As preferred, the AlSi10Mg powder comprises, by mass percentage: Si 10%, Mg 0.5%, and the balance is Al.

[0020] In a further technical solution, in step 1, the substrate material is placed on the heating plate and preheated to 100-150°C.

[0021] As preferred, when printing Inconel 718 and AlSi10Mg, the same / similar printing parameters are selected,

[0022] As further preferred, when printing Inconel 718 and AlSi10Mg, the same printing parameters are selected, and the printing is controlled as follows: laser power 500-620 W, scanning speed 350-410 mm / min, scanning interval 0.6-0.8 mm, spot diameter 1 mm, layer angle 90°; powder feeding amount 9-10 g / min, powder carrying gas flow rate 9-11 L / min.

[0023] As still further preferred, the control is as follows: laser power 600 W, scanning speed 400 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, layer angle 90°, powder feeding amount 10 g / min, powder carrying gas flow rate 10 L / min.

[0024] In a further technical solution, in step 1, the oxygen content in the argon environment is less than 500 ppm. In the present application, the oxygen content must be strictly controlled during printing, otherwise it is easy to cause the formation of porous oxidation.

[0025] As preferred, after printing the nickel-based component on the substrate in the present application, the AlSi10Mg coating is immediately printed on the printed nickel-based component. Once the printed nickel-based component is removed or allowed to cool completely or is in contact with air or other gas with the same content, the performance of the resulting product will be significantly reduced.

[0026] In the present application, the solid solution treatment promotes the melting of AlSi10Mg to enhance the bonding of AlSi10Mg with the matrix and generate NiAl.

[0027] In a further technical solution, in step 2, the main purpose of the solid solution treatment is to eliminate the cracks and holes formed in the printing process.

[0028] In a further technical solution, in step 2, the main purpose of the aging treatment is to make the elements in the coating further diffuse to make the distribution more uniform.

[0029] As a further illustration of the present application, when the resistance furnace is used for twice heat treatment, a rate of 30-40℃ / min is used to heat from room temperature to a preset temperature.

[0030] The present application breaks the traditional high-temperature coating through the traditional way of electric spraying, electroplating, chemical plating coating, and proposes an LMD forming Inconel718 integrated AlSi10Mg coating.

[0031] After optimization, the weight loss of the obtained product is less than or equal to 1.2mg / cm 2 after hot corrosion at 600℃ for 40h, and the weight loss is less than or equal to 12.5mg / cm 2 after hot corrosion at 900℃ for 40h.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] The present application forms an Inconel718 integrated AlSi10Mg coating by laser melting deposition technology, using optimized process parameters, and eliminates the cracks and holes formed in the printing process at the same time, and promotes the generation of NiAl phase through a two-step heat treatment method, finally obtains a thick and dense NiAl high-temperature corrosion resistant coating. Therefore, the Inconel718 integrated AlSi10Mg coating preparation process of the present application is simple, and has strong controllability, and the coating is more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The metallographic structure diagram of the change of the coating and the matrix before and after the two-step heat treatment in Example 1 of the present application;

[0035] Figure 2 The SEM microstructure diagram of the LMD formed Inconel718 integrated AlSi10Mg coating and the LMD formed nickel-based high-temperature alloy after hot corrosion in Example 1 and Comparative Example 1 of the present application;

[0036] Figure 3 The SEM diagram of the surface oxide layer in Example 1 and Comparative Example 1 of the present application.

[0037] Figure 1 consisting of a), b) from Figure 1 As can be seen from a), the interface between Inconel 718 and AlSi10Mg coating of the as-printed product before heat treatment has fine cracks. Figure 1 As can be seen from b), the fine cracks at the interface between Inconel 718 and AlSi10Mg coating disappear after two-step heat treatment.

[0038] Figure 2 consisting of a), b), c), d); wherein Figure 2 a) is the microstructure of the LMD formed nickel-based superalloy of Comparative Example 1 after hot corrosion at 600℃ for 40h, Figure 2 b) is the microstructure of the LMD formed Inconel 718 integrated with AlSi10Mg coating of Example 1 after hot corrosion at 600℃ for 40h, Figure 2 c) is the microstructure of the LMD formed nickel-based superalloy of Comparative Example 1 after hot corrosion at 900℃ for 40h, Figure 2 d) is the microstructure of the LMD formed Inconel 718 integrated with AlSi10Mg coating of Example 1 after hot corrosion at 900℃ for 40h. As can be seen from Figure 2 Inconel 718 integrated coating prepared by laser melting deposition can well protect the substrate from being damaged at both 600℃ and 900℃.

[0039] Figure 3 consisting of a), b), c), d), wherein Figure 3 a) is the microstructure of the top surface oxide layer of the LMD formed nickel-based superalloy of Comparative Example 1 after hot corrosion at 600℃ for 40h; Figure 3 b) is the microstructure of the top surface oxide layer of the LMD formed Inconel 718 integrated with AlSi10Mg coating of Example 1 after hot corrosion at 600℃ for 40h, Figure 3 c) is the microstructure of the top surface oxide layer of the LMD formed nickel-based superalloy of Comparative Example 1 after hot corrosion at 900℃ for 40h, Figure 3 d) is the microstructure of the top surface oxide layer of the LMD formed Inconel 718 integrated with AlSi10Mg coating of Example 1 after hot corrosion at 900℃ for 40h. As can be seen from Figure 3 It can be seen that the peeling degree of the oxide layer of the Inconel 718 integrated coating prepared by laser melting deposition is far less than that of the sample without coating of Comparative Example 1 after hot corrosion at different temperatures. DETAILED DESCRIPTION

[0040] The application will be further specifically and in detail described below in combination with specific examples.

[0041] Example 1

[0042] An Inconel 718 integrated AlSi10Mg coating sample is formed by laser melting deposition with the following experimental materials, the elemental composition of the Inconel 718 includes, in mass percentage: Ni 53.83%, Co 0.02%, Cr 18.05%, Mo 3.03%, Ti 1.02%, Nb 5.24%, Al 0.47%, C 0.031%, Fe balance. The elemental composition of the AlSi10Mg includes, in mass percentage: 10% Si, 0.5% Mg, Al balance.

[0043] Step one

[0044] The Inconel 718 integrated AlSi10Mg coating sample formed by laser melting deposition has the following selected process parameters: laser power 600 W, scanning speed 400 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, powder carrying gas flow rate 10 L / min. That is, the Inconel 718 powder is used as raw material, a nickel-based component is first printed on the substrate (the material of the substrate is 304 stainless steel, and the temperature is 150℃), and then the AlSi10Mg coating is printed on the set area of the nickel-based component; a to-be-processed piece is obtained; when the nickel-based component is prepared by printing, the laser power is 600 W, the scanning speed is 400 mm / min, the scanning interval is 0.6 mm, the spot diameter is 1 mm, the interlayer angle is 90°, the powder feeding amount is 10 g / min, and the powder carrying gas flow rate is 10 L / min.

[0045] When the AlSi10Mg coating is prepared by printing, the AlSi10Mg powder is used as raw material, and the laser power is controlled to be 600 W, the scanning speed is controlled to be 400 mm / min, the scanning interval is controlled to be 0.6 mm, the spot diameter is controlled to be 1 mm, the interlayer angle is controlled to be 90°, the powder feeding amount is controlled to be 2 r / min, and the powder carrying gas flow rate is controlled to be 10 L / min.

[0046] The printing is carried out in an argon environment, and the oxygen content is less than 500 ppm.

[0047] Step two

[0048] The to-be-processed piece (i.e., the to-be-processed piece obtained in step one) is subjected to heat treatment by LMD Inconel 718 integrated coating according to the method provided in the application, that is, after solid solution treatment at 1100℃ for 1 h, air cooling to room temperature, then heating to 720℃, holding at 720℃ for 8 h, and furnace cooling. (The heating rate is 35℃ / min)

[0049] 1) LMD forming Inconel 718 integrated coating sample was subjected to electric spark cutting to obtain a square-shaped sample with a size of 10 mm x 10 mm, and the sample was subjected to rough grinding, fine grinding, polishing and cleaning procedures in sequence. After the procedures were completed, the sample density was measured to be 99.6%;

[0050] 2) The alloy sample was immersed in a ceramic crucible filled with 80% Na2SO4+10% NaCl+10% NaVO3 powder;

[0051] 3) The crucible was then placed in a box-type heat treatment furnace, and hot corrosion treatment was carried out at 600°C and 900°C, respectively. The thermal cycle corrosion experiment was carried out for 4 hours each time, a total of ten cycles. After each hot corrosion, the sample was washed in water and weighed again. The weight loss of the product obtained at 600°C for 40 hours was 1.18 mg / cm 2 ; and the weight loss at 900°C for 40 hours was 12.18 mg / cm 2 .

[0052] Comparative Example 1

[0053] The following experimental materials were used for laser melting deposition forming of nickel-based superalloy, including: Ni 53.83%, Co 0.02%, Cr 18.05%, Mo 3.03%, Ti 1.02%, Nb 5.24%, Al 0.47%, C 0.031%, and Fe balance.

[0054] The process parameters of the laser melting deposition formed Inconel 718 sample were as follows: laser power 600 W, scanning speed 400 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, layer angle 90°, powder feeding amount 10 g / min, and powder feeding gas flow 10 L / min. The printing was carried out in an argon environment, and the oxygen content was less than 500 ppm.

[0055] 1) The LMD Inconel 718 alloy was subjected to heat treatment according to the process of this example, and after solution treatment at 1100°C for 1 hour, air cooling to room temperature, and then holding at 720°C for 8 hours, the sample was cooled in the furnace after the holding was completed. (Rising rate 35°C / min)

[0056] 2) The LMD Inconel 718 sample was subjected to electric spark cutting to obtain a square-shaped sample with a size of 10 mm x 10 mm, and the sample was subjected to rough grinding, fine grinding, polishing and cleaning procedures in sequence. After the procedures were completed, the sample density was measured to be 99.3%;

[0057] 3) The alloy sample was immersed in a ceramic crucible filled with 80% Na2SO4+10% NaCl+10% NaVO3 powder

[0058] 4) Put the crucible into the box-type heat treatment furnace, and perform hot corrosion corrosion at 600 °C and 900 °C, respectively, and the thermal cycle corrosion experiment is performed for ten cycles, four hours each time. After each hot corrosion, the sample is cleaned in water and then weighed. 2 ; the weight loss of the product obtained by hot corrosion at 900 °C for 40 h is 55.94 mg / cm 2 .

[0059] Comparative Example 2

[0060] The other conditions are the same as in Example 1, except that:

[0061] When laser melting deposition forming Inconel718 and printing AlSi10Mg coating, the laser power is controlled to be 600 W, the scanning speed is 500 mm / min, the scanning interval is 1.2 mm, the spot diameter is 2 mm, the interlayer angle is 90°, the powder feeding amount is 10 g / min, and the powder carrying gas flow is 12 L / min; the oxygen content is about 2000 ppm.

[0062] The obtained product Inconel718 integrated AlSi10Mg coating sample has a large number of microcracks and pores inside.

[0063] Comparative Example 3

[0064] The other conditions are the same as in Example 1, except that:

[0065] The commercially available Inconel718 alloy plate is used as the substrate, and the AlSi10Mg powder is used as the raw material, and the laser power is controlled to be 600 W, the scanning speed is 400 mm / min, the scanning interval is 0.6 mm, the spot diameter is 1 mm, the interlayer angle is 90°, the powder feeding amount is 10 g / min, and the powder carrying gas flow is 10 L / min. The printing is carried out in an argon environment, and the oxygen content is less than 500 ppm;

[0066] The printing state is heat treated, that is, after being heated to 1100 °C for 1 h, it is air cooled to room temperature, and then heat treated at 720 °C for 8 h and cooled in the furnace. (The heating rate is 40 °C / min)

[0067] The obtained product has a density of 98.3%, and the weight loss after hot corrosion at 600 °C for 40 h is 3.74 mg / cm 2 ; the weight loss after hot corrosion at 900 °C for 40 h is 22.42 mg / cm 2 .

[0068] Comparative Example 4

[0069] Inconel718 powder as raw material, first on the substrate printing nickel-based components (substrate material for 304 stainless steel, temperature of 150 ℃), printing, control: laser power 600 W, scanning speed 400 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, powder carrying gas flow 10 L / min. After printing, the nickel-based components are completely cooled, then take out, and then print AlSi10Mg on the completely cooled nickel-based components with AlSi10Mg powder as raw material, printing control: laser power 600 W, scanning speed 400 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, powder carrying gas flow 10 L / min. Printing is carried out in an argon environment, and the oxygen content is less than 500 ppm.

[0070] Heat treatment is carried out on the printed state, that is, after 1100 ℃ / 1 h, air cooling to room temperature, and then furnace cooling after 720 ℃ for 8 h (heating rate 35 ℃ / min).

[0071] The obtained product has a density of 99.1%, a weight loss of 2.43 mg / cm after hot corrosion at 600 ℃ for 40 h 2 , and a weight loss of 19.12 mg / cm after hot corrosion at 900 ℃ for 40 h 2 .

[0072] Example 2

[0073] Other conditions are the same as in Example 1, except that:

[0074] Inconel718 powder as raw material, control: laser power 500 W, scanning speed 350 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, powder carrying gas flow 10 L / min. After printing, AlSi10Mg powder is immediately used as raw material in the same device, control: laser power 500 W, scanning speed 350 mm / min, scanning interval 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, powder carrying gas flow 10 L / min.

[0075] Printing is carried out in an argon environment, and the oxygen content is less than 500 ppm.

[0076] The obtained product has a density of 97.9%, a weight loss of 2.24 mg / cm after hot corrosion at 600 ℃ for 40 h 2 , and a weight loss of 18.32 mg / cm after hot corrosion at 900 ℃ for 40 h 2 .

[0077] Example 3

[0078] Other conditions are consistent with Example 1, except that:

[0079] Inconel 718 powder as the base material, control: laser power 600W, scanning speed 400mm / min, scanning interval 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, powder carrying gas flow 10L / min. After printing, immediately in the same equipment, with AlSi10Mg powder as raw material, control: laser power 400W, scanning speed 400mm / min, scanning interval 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, powder carrying gas flow 10L / min. Printing is carried out in an argon environment, and the oxygen content is less than 500ppm.

[0080] The obtained product has a density of 98.2%, a weight loss of 2.75mg / cm 2 after hot corrosion at 600℃ for 40h, and a weight loss of 17.07mg / cm 2 after hot corrosion at 900℃ for 40h.

[0081] Example 4

[0082] Other conditions are consistent with Example 1, except that:

[0083] Inconel 718 powder as the base material, control: laser power 600W, scanning speed 400mm / min, scanning interval 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, powder carrying gas flow 10L / min. After printing, immediately in the same equipment, with AlSi10Mg powder as raw material, control: laser power 600W, scanning speed 400mm / min, scanning interval 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, powder carrying gas flow 10L / min. Printing is carried out in an argon environment, and the oxygen content is less than 500ppm;

[0084] The printing state is heat treated, that is, after 1000℃ / 1h, air cooling to room temperature, and then holding at 700℃ for 6h and cooling in the furnace. (Rising rate 30℃ / min)

[0085] The obtained product has a density of 98.7%, a weight loss of 3.45mg / cm 2 after hot corrosion at 600℃ for 40h, and a weight loss of 20.07mg / cm 2 after hot corrosion at 900℃ for 40h.

[0086]

[0087] The embodiments of the present application are not limited to the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application shall be equivalent replacements and shall be included in the protection scope of the present application.

Claims

1. An integrated method for preparing a high-density nickel-based alloy surface coating resistant to high-temperature corrosion, characterized in that, Includes the following steps: Step 1 Using Inconel 718 powder as raw material, nickel-based components are first printed on a substrate, and then an AlSi10Mg coating is printed on a designated area of ​​the obtained nickel-based components in the same printing equipment to obtain the part to be processed. When printing nickel-based components, the laser power is 500-800W, the scanning speed is 300-600mm / min, the scanning interval is 0.6-1.2mm, the spot diameter is 1-2mm, the interlayer angle is 90°, the powder feeding rate is 7-10g / min, and the powder carrier gas flow rate is 8-12L / min. When preparing the AlSi10Mg coating by printing, AlSi10Mg powder is used as the raw material, and the following settings are controlled: laser power 500-800W, scanning speed 300-600mm / min, scanning spacing 0.6-1.2mm, spot diameter 1-2mm, interlayer angle 90°, powder feed rate 7-10g / min, and powder carrier gas flow rate 8-12L / min. The printing process is carried out in an argon atmosphere. Step Two The part to be processed obtained in step one is subjected to two heat treatments to obtain the product: Solution treatment is performed at a temperature of 1000-1150℃, and the solution is held at that temperature for 1-1.5 hours, followed by aging treatment. The aging treatment temperature is 700-750℃, and the holding time is 6-8h.

2. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: The particle size of the Inconel 718 powder used is 53-150 μm, and the particle size of the AlSi10Mg powder used is 53-150 μm.

3. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: Inconel 718 powder, the composition of which, by mass percentage, includes: Ni 53.83%, Co 0.02%, Cr 18.05%, Mo 3.03%, Ti 1.02%, Nb 5.24%, Al 0.47%, C 0.031%, Fe balance.

4. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: AlSi10Mg powder, the composition of which, by mass percentage, includes: 10% Si, 0.5% Mg, and the balance being Al.

5. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: In step one, the substrate is placed on a heating plate and preheated to 100-150°C.

6. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: Use the same printing parameters when printing Inconel 718 and AlSi10Mg.

7. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 6, characterized in that: When printing Inconel 718 and AlSi10Mg, the following settings should be maintained: laser power 500-620W, scanning speed 350-410mm / min, scanning spacing 0.6-0.8mm, spot diameter 1mm, interlayer angle 90°, powder feed rate 7-10g / min, and powder carrier gas flow rate 9-11L / min.

8. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 7, characterized in that: When printing Inconel 718 and AlSi10Mg, the following settings were used: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle 90°, powder feed rate 7-10g / min, and powder carrier gas flow rate 10L / min.

9. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: In step one, the oxygen content in the argon atmosphere is less than 500 ppm.

10. The integrated preparation method of a high-density nickel-based alloy surface high-temperature corrosion resistant coating according to claim 1, characterized in that: For both solution treatment and aging treatment, a heating rate of 30-40℃ / min is used.

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