A corrosion-resistant and wear-resistant coating with a gradient combination structure and its preparation method

A combined structure and wear-resistant coating technology, which is applied in the 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 high corrosion resistance

Active Publication Date: 2022-04-26
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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  • A corrosion-resistant and wear-resistant coating with a gradient combination structure and its preparation method
  • A corrosion-resistant and wear-resistant coating with a gradient combination structure and its preparation method
  • A corrosion-resistant and wear-resistant coating with a gradient combination structure and its preparation method

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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 combination structure and a preparation method thereof, which is to clad alloy powder on the surface of a pretreated substrate by plasma cladding to obtain an alloy layer with a large thickness dendritic structure. Afterwards, the surface of the alloy layer is remelted by laser without feeding powder, and the growth of thick dendrites is fused to obtain a fine equiaxed crystal structure. After the plasma cladding of the present invention, a thick dendrite structure is formed. The dendrite has a peg effect on the substrate, and has a supporting effect on the subsequent laser high-speed cladding layer, which ensures the large-thickness coating, strengthens the combination with the substrate, and melts with high entropy. The alloy powder is fully and evenly mixed. The subsequent laser remelting can melt the thick dendrites and obtain fine and dense equiaxed crystals, which can block the propagation of corrosive media and improve corrosion resistance.

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 Patents(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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