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Composite cladding layer for preventing corrosion of molten chlorine salt and preparation method of composite cladding layer

A cladding layer, chloride salt technology, applied in the direction of fusion spraying, coating, metal material coating process, etc., can solve the problems of small spalling tendency of cladding layer, affecting material properties, reducing metal life, etc., to achieve spalling tendency Small, improve the purity, improve the effect of mechanical properties

Inactive Publication Date: 2021-07-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the existing technology, 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 composite cladding layer for preventing molten chloride salt corrosion and its preparation method , that is, a method of preparing a molten chloride salt corrosion-resistant cladding layer on the surface of the original metal component, which can effectively inhibit molten chloride salt corrosion and protect the metal material, thereby effectively improving production safety, prolonging the life of the metal component, and reducing production. The low cost and plasma cladding process has outstanding advantages such as high deposition rate, strong controllability of penetration depth, high bonding strength, and small tendency of cladding layer to peel off during service, and it can be constructed without being limited by the shape of the component. Low cost and broad prospects

Method used

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  • Composite cladding layer for preventing corrosion of molten chlorine salt and preparation method of composite cladding layer
  • Composite cladding layer for preventing corrosion of molten chlorine salt and preparation method of composite cladding layer
  • Composite cladding layer for preventing corrosion of molten chlorine salt and preparation method of composite cladding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1: Grind the 304 stainless steel base material to be sprayed with a size of 200*150*10mm to 800 mesh with sandpaper, wash it with distilled water, and dry it fully;

[0034] S2: Weigh 60 g of pure Ni, pure Mo and pure WC powders according to the mass ratio of 75:15:10, mix them uniformly, and place them in the powder feeder of the plasma cladding equipment;

[0035] S3: Adjust plasma cladding equipment parameters: ion gas flow rate, 5.0L / min, powder feeding gas flow rate, 5.5L / min, spraying atmosphere is argon, powder feeding speed 35g / min, cladding current 170A, cladding speed 400 / min min, and put the nozzle perpendicular to the direction of the base material to be sprayed, and start cladding until a 2mm thick cladding layer is obtained;

[0036] S4: After the cladding layer is cooled, use sandpaper to smooth the surface of the cladding layer.

[0037] Cut 10*10*2mm cladding layer and 3 base metals respectively by wire cutting method, polish the surface of the sample...

Embodiment 2

[0039] S1: Grind the 6061 aluminum alloy base material to be sprayed with a size of 2000*200*10mm to 800 mesh with sandpaper, wash it with distilled water, and fully dry it;

[0040] S2: Weigh 80 g of pure Ni, pure Mo and pure WC powders according to the mass ratio of 60:30:10, mix them uniformly, and place them in the powder feeder of the plasma cladding equipment;

[0041] S3: Adjust the plasma cladding equipment parameters: ion gas flow rate, 6.0L / min, powder feeding gas flow rate, 6.0L / min, spraying atmosphere is argon, powder feeding speed 30g / min, cladding current 180A, cladding speed 500 / min min, and put the nozzle perpendicular to the direction of the base material to be sprayed, and start cladding until a 2mm thick cladding layer is obtained;

[0042] S4: After the cladding layer is cooled, use sandpaper to smooth the surface of the cladding layer.

[0043] Cut 10*10*2mm cladding layer and 3 base metals respectively by wire cutting method, polish the surface of the sam...

Embodiment 3

[0045] S1: Grind the 625 nickel-based alloy base material to be sprayed with a size of 150*150*10mm to 800 mesh with sandpaper, wash it with distilled water, and fully dry it;

[0046] S2: Weigh 100 g of pure Ni, pure Mo and pure WC powders according to the mass ratio of 90:5:5, mix them uniformly, and place them in the powder feeder of the plasma cladding equipment;

[0047] S3: Adjust the parameters of plasma cladding equipment: ion gas flow rate, 4.5L / min, powder feeding gas flow rate, 4.5L / min, spraying atmosphere is argon, powder feeding speed 40g / min, cladding current 175A, cladding speed 450 / min min, and put the nozzle perpendicular to the direction of the base material to be sprayed, and start cladding until a 2mm thick cladding layer is obtained;

[0048] S4: After the cladding layer is cooled, use sandpaper to smooth the surface of the cladding layer.

[0049] Cut 10*10*2mm cladding layer and 3 base metals respectively by wire cutting method, polish the surface of t...

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Abstract

The invention discloses a composite cladding layer for preventing corrosion of molten chlorine salt and a preparation method of the composite cladding layer. The cladding layer comprises the following components of aNi-bMo-cWC, a is more than or equal to 60 and less than or equal to 90, b is more than or equal to 5 and less than or equal to 30, c is more than or equal to 5 and less than or equal to 10, and a + b + c = 100, the method comprises the following steps that the surface of a to-be-sprayed base metal is polished to be smooth, pure Ni powder, pure Mo powder and pure WC powder are evenly mixed according to a certain proportion and then loaded into a powder feeder of plasma cladding equipment, parameters of the plasma cladding equipment are adjusted, spraying is started, and a cladding layer is polished after the cladding layer is cooled. By the adoption of the preparation method, the problems that after metal and alloy exposed in the molten chlorine salt environment are corroded, the performance is reduced, the service life is shortened can be effectively solved, the method is flexible, applicable materials are wide, the cost is low, the obtained cladding layer is high in corrosion resistance, high in bonding strength and good in friction resistance, the process is safe and reliable, and operation is easy and rapid.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion, and in particular relates to a composite cladding layer for anti-corrosion of molten chloride salts and a preparation method thereof. Background technique [0002] In recent years, more and more high-temperature environments containing chlorine salts have appeared in more and more industrial productions, such as waste incineration, waste heat recovery in aluminum smelting process, cracking of ethylene dichloride, etc. A large amount of Cl-containing substances will be produced in these industrial productions, such as Cl 2 , NaCl, MgCl 2 etc. These substances will not only directly corrode alloys exposed to high-temperature chloride salt environment in industrial production, but also indirectly create conditions for the occurrence of hot corrosion, which will seriously affect material performance, shorten the service life of materials, and increase industrial production costs. . [0003]...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/134
CPCC23C4/06C23C4/134
Inventor 张国栋胡顺杰汪昌顺龚寅卿银航李成林薛龙建梅青松杨兵
Owner WUHAN UNIV