Integrated preparation method of high-temperature-corrosion-resistant coating on surface of high-densification nickel-based alloy

Abstract

The invention relates to the technical field of metal coating preparation, in particular to an integrated preparation method of a high-temperature-corrosion-resistant coating on the surface of a high-densification nickel-based alloy. According to the method, Inconel 718 powder serves as a raw material, a nickel-based component is printed on a substrate firstly, then AlSi10Mg powder serves as a raw material immediately, and an AlSi10Mg layer is printed on the obtained printed nickel-based component; and obtaining a printed product. Sequentially carrying out two times of heat treatment on the printed product to obtain a product; the solution treatment temperature is 1050-1150 DEG C for the first time, and the aging treatment temperature is 700-750 DEG C for the second time. The obtained product has excellent thermal corrosion resistance, the preparation method is simple and controllable, and industrial application is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of metal coating preparation, and more specifically to an integrated preparation method for a high-densification nickel-based alloy surface high-temperature corrosion-resistant coating. Background Art

[0002] Inconel 718 alloy is a niobium-modified nickel-based austenitic high-temperature alloy. Due to its excellent strength and high-temperature oxidation resistance, it has been widely used in gas turbines and other high-temperature components. However, when preparing high-temperature alloy components with extremely complex structures, traditional preparation methods such as investment casting have problems such as high manufacturing difficulty, low component quality and low product qualification rate. In addition, gas turbines are usually in service in high-temperature salt spray environments, and elements such as Na, Cl, V and S in the salt spray will form Na during the combustion process. 2 SO 4 (melting point 884°C), NaVO 3 (melting point 600℃), NaCl (melting point 801℃) and other salt pollutants. These generated salt pollutants will destroy the oxide layer on the surface of nickel-based alloy components, reduce their high-temperature oxidation resistance and shorten their service life. With the continuous development of modern technology, the service environment of modern gas turbines has become very harsh. In some extreme service environments, 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 an urgent problem to be solved in the application of nickel-based alloys in gas turbines.

[0003] Nickel aluminum compounds will form dense and continuous aluminum oxide flakes during high-temperature service, thereby effectively protecting gas turbine components from oxidation and corrosion at temperatures as high as 1100°C. Therefore, β-NiAl is a protective coating commonly used to improve the heat corrosion resistance of nickel-based alloys. Currently, the commonly used methods for manufacturing β-NiAl protective coatings are: 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 coatings, high cost, and long processing cycle. Therefore, seeking a method for efficiently preparing durable, thick, high-quality, and low-cost β-NiAl coatings is the primary issue to ensure that nickel-based alloy gas turbines can serve stably and for a long time.

[0004] Laser melting deposition technology can achieve heterogeneous connection of two different materials and is a new coating preparation technology. Therefore, the present invention selects low-cost AlSi10Mg as the raw material for strengthening the coating, uses laser melting deposition technology to prepare the corresponding coating, and uses a two-step heat treatment method to achieve the preparation of a high-density NiAl coating, thereby effectively improving the high-temperature corrosion resistance of nickel-based alloy components. Summary of the invention

[0005] In view of the problems that existing nickel-based high-temperature alloy complex components are difficult to prepare and have poor heat and corrosion resistance, the present invention proposes for the first time to first prepare Inconel 718 alloy using laser melting deposition (LMD) technology, and then immediately prepare AlSi10Mg coating on the surface of Inconel 718 alloy using the same or similar process parameters; and cooperate with subsequent heat treatment process to further improve the heat resistance and corrosion resistance of the product.

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

[0007] The technical solution adopted by the present invention includes a heat treatment solution, which solves the problems of holes and cracks that are easily generated in laser melting deposition of two heterogeneous materials.

[0008] The present invention discloses an integrated preparation method for a high-densification nickel-based high-temperature alloy surface heat-resistant corrosion coating, comprising the following steps: Step 1 Using Inconel 718 powder as raw material, first print a nickel-based component on a substrate, and then print an AlSi10Mg coating on a set area of ​​the obtained nickel-based component in the same printing device; when printing and preparing the nickel-based component, the laser power is 500-800W, the scanning speed is 300-600mm / min, the scanning spacing 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 rate is 8-12L / min; When printing and preparing AlSi10Mg coating, AlSi10Mg powder is used as raw material, and the following conditions 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 feeding amount 7-10g / min, and powder carrier gas flow rate 8-12L / min.

[0009] The printing process was carried out under argon protective atmosphere.

[0010] Step 2 The workpiece to be processed obtained in step 1 is subjected to heat treatment twice in sequence to obtain a product; The temperature of the solution treatment is 1000-1150°C, preferably 1050-1150°C, and more preferably 1100°C for heat treatment, and the temperature is kept for 1-1.5h, preferably 1.2h. After the solution treatment, an aging treatment is performed. The temperature of the aging treatment is 700-750°C, preferably 720°C, and the insulation time is 6-8h, preferably 8h.

[0011] Preferably, in the present invention, 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.

[0012] Preferably, the composition of Inconel 718 powder is calculated by mass percentage, including: Ni53.83%, Co0.02%, Cr18.05%, Mo3.03%, Ti1.02%, Nb5.24%, Al0.47%, C0.031%, and Fe balance. Of course, other products modified and / or doped and / or quenched and tempered based on the existing Inconel 718 alloy can also be used in the present invention.

[0013] Preferably, the AlSi10Mg powder has a composition, in mass percentage, comprising: Si 10%, Mg 0.5% and the remainder Al.

[0014] According to a further technical solution, in step 1, the substrate material is placed on a heating plate and preheated to 100-150°C.

[0015] As a preference, when printing Inconel 718 and AlSi10Mg, use the same / similar printing parameters. As a further preference, when printing Inconel 718 and AlSi10Mg, the same printing parameters are selected, and the following are controlled during printing: laser power 500-620W, scanning speed 350-410mm / min, scanning spacing 0.6-0.8mm, spot diameter 1mm, interlayer angle: 90°; powder feeding amount 9-10g / min, powder carrier gas flow rate 9-11L / min.

[0016] As a further preference, the following control conditions are adopted: laser power 600 W, scanning speed 400 mm / min, scanning spacing 0.6 mm, spot diameter 1 mm, interlayer angle: 90°, powder feeding amount 10 g / min, and powder carrier gas flow rate 10 L / min.

[0017] In a further technical solution, in step 1, the oxygen content in the argon environment is less than 500 ppm. In the present invention, the oxygen content must be strictly controlled during printing, otherwise it is very easy to cause the formation of porous oxidation.

[0018] Preferably, after printing the nickel-based component on the substrate, the present invention immediately prints the AlSi10Mg coating on the printed nickel-based component. Once the printed nickel-based component is removed or completely cooled or contacts with air or other gases, the performance of the resulting product will be significantly reduced.

[0019] In the present invention, the solution treatment promotes the melting of AlSi10Mg to enhance the bonding between AlSi10Mg and the matrix and generate NiAl.

[0020] In a further technical solution, in step 2, the main purpose of the solution treatment is to eliminate cracks and holes formed during the printing process.

[0021] According to a further technical solution, in step 2, the main purpose of the aging treatment is to further diffuse the elements in the coating so that their distribution is more uniform.

[0022] As a further illustration of the present invention, when the resistance furnace is used for the two heat treatments, the heating rate is 30-40° C. / min from room temperature to a preset temperature.

[0023] The present invention breaks the traditional method of coating high temperature coating by electrospraying, electroplating and chemical plating, and proposes an Inconel 718 integrated AlSi10Mg coating formed by LMD.

[0024] After optimization, the weight loss of the obtained product at 600℃ for 40h is less than or equal to 1.2mg / cm 2 ; 900℃ hot corrosion for 40h weight loss is less than or equal to 12.5mg / cm 2 .

[0025] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses laser melting deposition technology and optimized process parameters to form an Inconel 718 integrated AlSi10Mg coating, and eliminates cracks and holes formed during the printing process through a two-step heat treatment method, while promoting the generation of NiAl phases, and finally obtaining a thick and dense NiAl high temperature corrosion resistant coating. Therefore, the preparation process of the Inconel 718 integrated AlSi10Mg coating of the present invention is simple, and has strong controllability, and the coating is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The metallographic structure diagram of the change of the junction between the coating and the substrate before and after the two-step heat treatment in Example 1 of the present invention; Figure 2 The SEM microstructure diagram of the LMD formed Inconel 718 integrated AlSi10Mg coating and the LMD formed nickel-based high-temperature alloy after hot corrosion in Example 1 of the present invention and Comparative Example 1; Figure 3 The SEM images of the surface oxide layers of Example 1 of the present invention and Comparative Example 1 are shown.

[0027] Figure 1 It is composed of a and b. Figure 1 It can be seen from a that there are fine cracks at the interface between Inconel 718 and AlSi10Mg coating of the printed product before heat treatment. Figure 1 It can be seen from b that after the two-step heat treatment, the fine cracks at the interface between Inconel 718 and AlSi10Mg coating disappear.

[0028] Figure 2 It is composed of a, b, c, d; Figure 2 a is the microstructure of the LMD-formed nickel-based high-temperature alloy obtained in Comparative Example 1 after hot corrosion at 600°C for 40 hours. Figure 2 b is the microstructure of the LMD formed Inconel 718 integrated AlSi10Mg coating in Example 1 after hot corrosion at 600°C for 40h. Figure 2 c is the microstructure of the LMD-formed nickel-based high-temperature alloy obtained in Comparative Example 1 after hot corrosion at 900°C for 40 hours. Figure 2 d is the microstructure of the LMD formed Inconel 718 integrated AlSi10Mg coating in Example 1 after hot corrosion at 900℃ for 40h. Figure 2 It can be seen that the Inconel 718 integrated coating prepared by laser melting deposition can well protect the substrate from being damaged.

[0029] Figure 3 It is composed of a, b, c, and d, among which Figure 3 a is a microstructure of the top oxide layer of the LMD-formed nickel-based high-temperature alloy obtained in Comparative Example 1 after hot corrosion at 600°C for 40 hours; Figure 3 b is the microstructure of the top oxide layer of the LMD formed Inconel 718 integrated AlSi10Mg coating after hot corrosion at 600°C for 40h in Example 1. Figure 3 c Microstructure of the top oxide layer of the LMD-formed nickel-based high-temperature alloy obtained in Comparative Example 1 after hot corrosion at 900℃ for 40h, Figure 3 d is the microstructure of the top oxide layer of the LMD formed Inconel 718 integrated AlSi10Mg coating after hot corrosion at 900°C for 40h in Example 1. Figure 3 It can be seen that the degree of peeling of the oxide layer of the Inconel 718 integrated coating prepared by laser melting deposition after thermal corrosion at different temperatures is much smaller than that of the uncoated sample in Comparative Example 1. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments.

[0031] Example 1 The following experimental materials were used for laser melting deposition to form an Inconel 718 integrated AlSi10Mg coating sample. The Inconel 718 element composition, by mass percentage, includes: Ni53.83%, Co0.02%, Cr18.05%, Mo3.03%, Ti1.02%, Nb5.24%, Al0.47%, C0.031%, Fe balance. The AlSi10Mg element composition, by mass percentage, includes: 10% Si, 0.5% Mg, Al balance.

[0032] Step 1 The selected process parameters for the Inconel 718 integrated AlSi10Mg coating sample formed by laser melting deposition are: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder-carrying gas flow rate 10L / min. That is, using Inconel 718 powder as raw material, first print the nickel-based component on the substrate (the material of the substrate is 304 stainless steel and the temperature is 150°C), and then immediately print the AlSi10Mg coating in the set area of ​​the nickel-based component; obtain the part to be processed; when printing and preparing the nickel-based component, the laser power is 600W, the scanning speed is 400mm / min, the scanning spacing is 0.6mm, the spot diameter is 1mm, the interlayer angle is 90°, the powder feeding amount is 10g / min, and the powder-carrying gas flow rate is 10L / min; When printing and preparing AlSi10Mg coating, AlSi10Mg powder is used as raw material, and the following conditions are controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding rate 2r / min, and powder carrier gas flow rate 10L / min.

[0033] Printing is done in an argon environment with an oxygen content of less than 500ppm; Step 2 The method provided by the present invention is used to heat treat the LMD Inconel 718 integrated coating (i.e., the workpiece to be treated in step 1), that is, after solution treatment at 1100°C for 1 hour, air cooling to room temperature, heating to 720°C, keeping at 720°C for 8 hours, and then cooling with the furnace. (Heating rate 35°C / min) 1) The LMD molded Inconel 718 integrated coating sample was electrospark cut to obtain a square sheet sample with a size of 10mm×10mm, and the sample was subjected to coarse grinding, fine grinding, polishing and cleaning processes in sequence. After the process was completed, the sample density was measured to be 99.6%; 2) Immerse the alloy sample in a 2 SO 4+10%NaCl+10%NaVO 3 The powder is placed in a ceramic crucible; 3) Then put the crucible into a box-type heat treatment furnace and perform thermal corrosion treatment at 600℃ and 900℃ respectively. The thermal cycle corrosion test was carried out for 10 cycles with each cycle lasting 4 hours. After each thermal corrosion, the sample was washed in water and the sample weight was weighed. The weight loss of the obtained product after thermal corrosion at 600℃ for 40 hours was 1.18mg / cm 2 ; The weight loss after 40h hot corrosion at 900℃ is 12.18mg / cm 2 .

[0034] Comparative Example 1 Laser melting deposition was performed on the following experimental materials to form a nickel-based high-temperature alloy, which, in terms of mass percentage, included: 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.

[0035] The process parameters of the Inconel 718 sample formed by laser melting deposition are as follows: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, powder carrier gas flow rate 10L / min. Printing is carried out in an argon environment with an oxygen content of less than 500ppm.

[0036] 1) LMD Inconel 718 alloy was heat treated in this process. After solution treatment at 1100℃ for 1 hour, it was air-cooled to room temperature and then kept at 720℃ for 8 hours. After the heat preservation, it was cooled in the furnace. (Heating rate 35℃ / min) 2) The LMD Inconel 718 sample was electrospark cut to obtain a square sample with a size of 10 mm × 10 mm, and the sample was subjected to coarse grinding, fine grinding, polishing and cleaning processes in sequence. After the process was completed, the density was measured to be 99.3%; 3) Immerse the alloy sample in a 2 SO 4 +10%NaCl+10%NaVO 3 Powder in a ceramic crucible 4) Then put the crucible into a box-type heat treatment furnace and perform thermal corrosion at 600℃ and 900℃ respectively. The thermal cycle corrosion test is carried out for 10 cycles for 4 hours each time. After each thermal corrosion, the sample is washed in water and then weighed. The weight loss of the obtained product after 40 hours of thermal corrosion at 600℃ is 14.02mg / cm 2 ; The weight loss after 40h hot corrosion at 900℃ is 55.94mg / cm 2 .

[0037] Comparative Example 2 Other conditions are the same as those in Example 1, except that: When forming Inconel 718 by laser melting deposition and printing to prepare AlSi10Mg coating, the laser power is controlled to 600W, the scanning speed is 500mm / min, the scanning spacing is 1.2mm, the spot diameter is 2mm, the interlayer angle is 90°, the powder feeding amount is 10g / min, and the powder-carrying gas flow rate is 12L / min; the oxygen content is about 2000ppm.

[0038] The obtained product, Inconel 718 integrated AlSi10Mg coating sample, has a large number of microcracks and holes inside.

[0039] Comparative Example 3 Other conditions are the same as those in Example 1, except that: The commercially available Inconel 718 alloy plate was used as the substrate, and AlSi10Mg powder was used as the raw material. The following conditions were controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. Printing was performed in an argon environment with an oxygen content of less than 500ppm. The printed state was heat treated, that is, after 1100℃ / 1h, air-cooled to room temperature, kept at 720℃ for 8h, and then cooled in the furnace. (Heating rate 40℃ / min) The obtained product has a density of 98.3% and a weight loss of 3.74 mg / cm2 after hot corrosion at 600°C for 40 h. 2 ; The weight loss after 40h hot corrosion at 900℃ is 22.42mg / cm 2 .

[0040] Comparative Example 4 Using Inconel 718 powder as raw material, first print the nickel-based component on the substrate (the material of the substrate is 304 stainless steel and the temperature is 150°C). During printing, the following conditions are controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder-carrying gas flow rate 10L / min. After printing, the nickel-based component is completely cooled and taken out, and then AlSi10Mg powder is used as raw material to print AlSi10Mg on the completely cooled nickel-based component. During printing, the following conditions are controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder-carrying gas flow rate 10L / min. Printing is carried out in an argon environment with an oxygen content of less than 500ppm.

[0041] The printed state was heat treated at 1100℃ / 1h, then air-cooled to room temperature, kept at 720℃ for 8h, and then cooled in the furnace. (Heating rate 35℃ / min) The obtained product has a density of 99.1% and a weight loss of 2.43 mg / cm2 after hot corrosion at 600℃ for 40 hours. 2 ; The weight loss after 40h hot corrosion at 900℃ is 19.12mg / cm 2 .

[0042] Example 2 Other conditions are the same as those in Example 1, except that: Inconel 718 powder was used as the matrix material, and the following conditions were controlled: laser power 500W, scanning speed 350mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. After printing, AlSi10Mg powder was used as the raw material in the same device, and the following conditions were controlled: laser power 500W, scanning speed 350mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min.

[0043] Printing is performed in an argon environment with an oxygen content of less than 500ppm.

[0044] The obtained product has a density of 97.9% and a weight loss of 2.24 mg / cm2 after hot corrosion at 600°C for 40 h. 2 ; The weight loss after 40h hot corrosion at 900℃ is 18.32mg / cm 2 .

[0045] Example 3 Other conditions are the same as those in Example 1, except that: Inconel 718 powder was used as the matrix material, and the following conditions were controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. After printing, AlSi10Mg powder was used as the raw material in the same device, and the following conditions were controlled: laser power 400W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. Printing was performed in an argon environment with an oxygen content of less than 500ppm.

[0046] The obtained product has a density of 98.2% and a weight loss of 2.75 mg / cm2 after hot corrosion at 600°C for 40 h. 2 ; The weight loss after 40h hot corrosion at 900℃ is 17.07mg / cm 2 .

[0047] Example 4 Other conditions are the same as those in Example 1, except that: Inconel 718 powder was used as the matrix material, and the following conditions were controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. After printing, AlSi10Mg powder was used as the raw material in the same device, and the following conditions were controlled: laser power 600W, scanning speed 400mm / min, scanning spacing 0.6mm, spot diameter 1mm, interlayer angle: 90°, powder feeding amount 10g / min, and powder carrier gas flow rate 10L / min. Printing was performed in an argon environment with an oxygen content of less than 500ppm. The printed state is heat treated, that is, after 1000℃ / 1h, air-cooled to room temperature, kept at 700℃ for 6h, and then cooled in the furnace. (Heating rate 30℃ / min) The obtained product has a density of 98.7% and a weight loss of 3.45 mg / cm2 after hot corrosion at 600℃ for 40 hours. 2 ; The weight loss after 40h hot corrosion at 900℃ is 20.07mg / cm 2 .

[0048]

[0049] The implementation methods of the present invention are not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. An integrated preparation method for a high-densification nickel-based alloy surface high-temperature corrosion-resistant coating, characterized in that: The steps include: Step 1 Using Inconel 718 powder as a raw material, first printing a nickel-based component on a substrate, and then printing an AlSi10Mg coating on a set area of ​​the obtained nickel-based component in the same printing device to obtain a part to be processed; When printing and preparing nickel-based components, the laser power is 500-800W, the scanning speed is 300-600mm / min, the scanning spacing 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 rate is 8-12L / min; When printing and preparing AlSi10Mg coating, AlSi10Mg powder is used as raw material, and the following conditions 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 feeding amount 7-10g / min, and powder-carrying gas flow rate 8-12L / min; The printing process is carried out under a protective atmosphere; Step 2 The workpiece to be processed obtained in step 1 is subjected to heat treatment twice to obtain a product; The temperature of the solution treatment is 1000-1150°C, preferably 1050-1150°C, and more preferably 1100°C for heat treatment, and then the aging treatment is performed after keeping the temperature for 1-1.5 hours. The temperature of the aging treatment is 700-750° C., preferably 720° C., and the insulation time is 6-8 hours.

2. The integrated preparation method of a high-densification 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-densification nickel-based alloy surface high-temperature corrosion-resistant coating according to claim 1, characterized in that: Inconel 718 powder, whose composition is calculated 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-densification nickel-based alloy surface high-temperature corrosion-resistant coating according to claim 1, characterized in that: The composition of AlSi10Mg powder is calculated by mass percentage and includes: Si 10%, Mg 0.5%, and the balance is Al.

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

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

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

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

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

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

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