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Corrosion-resistant and wear-resistant coating with gradient composite structure and preparation method thereof

A technology of combined structure and wear-resistant coating, applied in the direction of coating, metal material coating process, etc., can solve the problems of difficult operation and high cost, and achieve the effect of improving strength, hardness, and fine grain.

Active Publication Date: 2021-07-16
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can improve the impact resistance and corrosion resistance of coating materials, but if you want to obtain ultra-thick coatings with strong metallurgical bonding, you need to alternately repeat plasma spraying and plasma spraying, which is costly and difficult to operate.

Method used

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  • Corrosion-resistant and wear-resistant coating with gradient composite structure and preparation method thereof
  • Corrosion-resistant and wear-resistant coating with gradient composite structure and preparation method thereof
  • Corrosion-resistant and wear-resistant coating with gradient composite structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Powder Preparation

[0039] The raw material of the wear-resistant and corrosion-resistant alloy coating is metal powder with a particle size of 45-75 μm, and its proportion is: Co:Cr:Ni:Fe:Ti=22.5:22.5:22.5:22.5:10 (atomic ratio).

[0040] Step 2: Substrate surface pretreatment

[0041] The first is to soak the base Q235 steel in the acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0042] Step 3: Plasma Cladding

[0043] Such as figure 1 As shown, in the implementation, first place the base Q235 steel on the workbench, adopt the method of plasma cladding, through the method of coaxial powder feeding, cladding the alloy powder prepared in step 1 on the...

Embodiment 2

[0048] Step 1: Powder Preparation

[0049] The raw material of the wear-resistant and corrosion-resistant alloy coating is metal powder with a particle size of 45-75 μm, and its ratio is: Co: Cr: Fe: Ni: Ti: Al: Cu = 20: 20: 20: 20: 10: 5: 5 (atomic ratio).

[0050] Step 2: Substrate surface pretreatment

[0051] The first is to soak the base Q235 steel in the acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0052] Step 3: Plasma Cladding

[0053] The plasma cladding process parameters are: voltage 50V, current 90A, cladding distance 8mm, cladding speed 400mm / min, powder feeding speed 20g / min, average hardness of cladding layer 620HV 0.1 .

[0054] Step 4: Laser Re...

Embodiment 3

[0058] Step 1: Powder Preparation

[0059] The raw material of wear-resistant and corrosion-resistant alloy coating is metal and ceramic powder with a particle size of 45-75 μm, and the ratio is: Co: Cr: Fe: Ni: Ti: Al: Cu: TiC: WC: TiB 2 =20:20:20:20:10:2:2:2:2:2 (atomic ratio).

[0060] Step 2: Substrate surface pretreatment

[0061] The first is to soak the base Q235 steel in the acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0062] Step 3: Plasma Cladding

[0063] The plasma cladding process parameters are: voltage 60V, current 150A, cladding distance 12mm, cladding speed 600mm / min, powder feeding speed 30g / min; average hardness of the cladding layer is 900HV ...

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Abstract

The invention discloses a corrosion-resistant and wear-resistant coating with a gradient composite structure and a preparation method thereof. According to the corrosion-resistant and wear-resistant coating, by cladding alloy powder on the surface of a pretreated matrix through a plasma cladding method to obtain an alloy layer with a large-thickness dendritic structure, and then re-melting and fusing growth of thick dendrites on the surface of the alloy layer through non-powder-feeding laser, so that a fine equiaxed crystal structure is obtained. According to the preparation method, a thick dendrite structure is formed after plasma cladding, dendrites have a nail pile effect on a matrix and have a supporting effect on a subsequent laser high-speed cladding layer, it is guaranteed that a large-thickness coating is obtained, combination with the matrix is strengthened, and the molten high-entropy alloy powder is fully and evenly mixed; and through subsequent laser remelting, thick dendrites can be fused, fine and compact isometric crystals are obtained, propagation of a corrosive medium is blocked, and corrosion resistance is improved.

Description

technical field [0001] The invention relates to a wear-resistant and corrosion-resistant high-entropy alloy coating material with combined structure and its preparation technology, which belongs to the field of metal material surface treatment. Specifically, it discloses a high-energy beam surface modification method using plasma cladding plus laser remelting to efficiently obtain a coating material with a combined structure of dendrite plus equiaxed crystal gradient. While plasma cladding guarantees a large-thickness coating and a good metallurgical bond between the substrate and the coating, high-power high-speed laser remelting increases the cooling rate of the coating surface, regulates the microstructure, improves compactness, reduces porosity, and achieves fineness. The effect of crystallization, reduce defects, improve the mechanical properties of the coating surface and the wear resistance and corrosion resistance. Background technique [0002] A large number of key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00C22C30/02C22C32/00
CPCC23C24/103C23C24/106C22C30/00C22C30/02C22C32/0047
Inventor 崔洪芝姜迪陈浩崔中雨满成李燚周王昕李健
Owner OCEAN UNIV OF CHINA
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