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Ni-Mo-Al2O3 metal coating for preventing molten chlorine salt corrosion and preparation method for Ni-Mo-Al2O3 metal coating

An ani-bmo-cal2o3, metal coating technology, applied in pressure inorganic powder coating and other directions, can solve the problems of reducing metal life, affecting material properties, etc., to reduce coating costs, excellent mechanical properties, and high bonding strength. Effect

Active Publication Date: 2021-07-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, in order to solve the problem that molten chloride salt corrosion reduces metal life and affects material performance in the existing environment, the present invention proposes a Ni-Mo-Al material for preventing molten chloride salt corrosion. 2 o 3 A metal coating and a preparation method thereof, that is, a method for preparing a molten chloride salt corrosion-resistant coating on the surface of an original metal

Method used

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  • Ni-Mo-Al2O3 metal coating for preventing molten chlorine salt corrosion and preparation method for Ni-Mo-Al2O3 metal coating
  • Ni-Mo-Al2O3 metal coating for preventing molten chlorine salt corrosion and preparation method for Ni-Mo-Al2O3 metal coating
  • Ni-Mo-Al2O3 metal coating for preventing molten chlorine salt corrosion and preparation method for Ni-Mo-Al2O3 metal coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Grind the 304 stainless steel substrate to be sprayed with a size of 100*100*5mm to 800 mesh with sandpaper, wash it with distilled water, and fully dry it;

[0033] 2) Pure Ni, pure Mo and pure Al 2 o 3 Powder, weigh 100g according to the mass ratio of 80:15:5 and mix evenly, and place it in the powder feeder of the cold spraying equipment;

[0034] 3) Adjust the parameters of the cold spraying equipment: spraying temperature 450°C, spraying air pressure 0.8MPa, spraying atmosphere is argon, powder feeding speed 20g / min, spraying distance 15mm, spray gun moving speed 1.5mm / s. Put the nozzle perpendicular to the direction of the substrate to be sprayed, and start spraying until a 2mm thick coating is obtained;

[0035] 4) After the coating is cooled, use sandpaper to smooth the surface of the coating.

[0036] Cut the coating and substrate with a size of 10*10*2mm by wire cutting method, polish the surface of the sample smoothly, and put it into NaCl-MgCl at 750°C...

Embodiment 2

[0038] 1) Polish the 6061 aluminum alloy substrate to be sprayed with a size of 100*100*5mm to 800 mesh with sandpaper, wash it with distilled water, and fully dry it;

[0039] 2) Pure Ni, pure Mo and pure Al 2 o 3 Powder, weigh 100g according to the mass ratio of 70:20:10 and mix evenly, place in the powder feeder of cold spray equipment;

[0040] 3) Adjust the parameters of cold spraying equipment: spraying temperature 500°C, spraying air pressure 0.75MPa, spraying atmosphere is argon, powder feeding speed 20g / min, spraying distance 12mm, spray gun moving speed 1.5mm / s. Put the nozzle perpendicular to the direction of the substrate to be sprayed, and start spraying until a 2mm thick coating is obtained;

[0041] 4) After the coating is cooled, use sandpaper to smooth the surface of the coating.

[0042] Cut the coating and substrate with a size of 10*10*2mm by wire cutting method, polish the surface of the sample smoothly, and put it into NaCl-MgCl at 750°C with a mass rati...

Embodiment 3

[0044] 1) Grind the 625 nickel-based alloy substrate to be sprayed with a size of 100*100*5mm to 800 mesh with sandpaper, wash it with distilled water, and fully dry it;

[0045] 2) Pure Ni, pure Mo and pure Al 2 o 3 Powder, weigh 100g according to the mass ratio of 90:0:10 and mix evenly, and place it in the powder feeder of the cold spraying equipment;

[0046] 3) Adjust cold spray equipment parameters: spray temperature 500°C, spray pressure 0.9MPa, spray atmosphere is argon, powder feeding speed 20g / min, spray distance 10mm, spray gun moving speed 1.0mm / s. Put the nozzle perpendicular to the direction of the substrate to be sprayed, and start spraying until a 2mm thick coating is obtained;

[0047] 4) After the coating is cooled, use sandpaper to smooth the surface of the coating.

[0048] Cut the coating and substrate with a size of 10*10*2mm by wire cutting method, polish the surface of the sample smoothly, and put it into NaCl-MgCl at 750°C with a mass ratio of 3:2:2...

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Abstract

The invention discloses a Ni-Mo-Al2O3 metal coating for preventing molten chlorine salt corrosion and a preparation method for the Ni-Mo-Al2O3 metal coating. The coating is prepared from the following component: aNi-bMo-cAl2O3, wherein a is greater than or equal to 60 and less than or equal to 90, b is greater than or equal to 0 and less than or equal to 25, c is greater than or equal to 10 and less than or equal to 15, and a+b+c=100. The preparation method comprises the following steps that the surface of a to-be-sprayed base body is polished to be smooth, pure Ni powder, pure Mo powder and pure Al2O3 powder are evenly mixed according to a certain proportion and then are put into a powder feeder of cold spraying equipment, the cold spraying parameters are adjusted, spraying is started, and after a coating is cooled, the coating is polished. The molten-chlorine-salt-corrosion-resistant coating and the preparation method thereof are adopted and have the advantages that the problems that the performance is reduced and the service life is shortened after metal exposed in a molten chlorine salt environment is corroded can be effectively solved; and meanwhile, the preparation method is flexible, wide in application range, low in requirement for the shape of the base body, low in cost, safe and reliable in process and easy and rapid to operate.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion, in particular to a Ni-Mo-Al used for anti-corrosion of molten chloride salts 2 o 3 Metallic coatings and methods for their preparation. Background technique [0002] In recent years, the application of alloys in chlorine-containing high-temperature environments has shown an increasing trend, and the ensuing material corrosion problem has also become more prominent. Corrosive molten chlorine salts exist in many industrial environments, such as chlorination of hydrocarbons, cracking of ethylene dichloride, waste heat recovery in aluminum smelting processes, incineration of industrial and municipal waste, coal In the processes of combustion, vaporization, and thermal decomposition of seawater, a large amount of HCl and other Cl-containing substances are contained, such as NaCl, MgCl 2 , AlCl 3 , FeCl 3 etc., they can not only directly corrode alloys in high temperature environment, but a...

Claims

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Application Information

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IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 张国栋胡顺杰徐博聘周梦萱银航李成林薛龙建梅青松杨兵
Owner WUHAN UNIV