Preparation method of low-cost light-weight high-entropy alloy/aluminum oxide composite coating on surface of magnesium alloy

A high-entropy alloy and composite coating technology, applied in the direction of pressure inorganic powder coating, can solve the problems of high cost, easy to wear, single high-entropy alloy coating density, and easy corrosion of magnesium alloy, so as to improve service performance and cost Low, excellent corrosion resistance and wear resistance

Active Publication Date: 2021-09-28
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a method for preparing a low-cost, light-weight high-entropy alloy / alumina composite coating on the surface of a magnesium alloy in order to overcome the bottlenecks of magnesium alloys being easy to corrode and wear and the disadvantages of high density and high cost of a single high-entropy alloy coating

Method used

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  • Preparation method of low-cost light-weight high-entropy alloy/aluminum oxide composite coating on surface of magnesium alloy
  • Preparation method of low-cost light-weight high-entropy alloy/aluminum oxide composite coating on surface of magnesium alloy
  • Preparation method of low-cost light-weight high-entropy alloy/aluminum oxide composite coating on surface of magnesium alloy

Examples

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Effect test

Embodiment example 1

[0025] (1) Use 1000-mesh and 2000-mesh sandpaper to polish the surface of the AZ91D magnesium alloy substrate in sequence, and then use the sandblasting process to roughen the surface of the substrate and remove surface impurities and oxides. The sandblasting pressure is 0.5MPa, and the sandblasting The time is 15s, the mesh number of the sand shot is 100-200 mesh, and finally the substrate for cold spraying is obtained.

[0026] (2) Use Co, Cr, Fe, Ni raw materials with a purity of more than 99.5%, use mechanical methods to remove the surface oxide scales of raw metal Co, Cr, Fe, Ni, and use industrial ethanol to ultrasonically clean the raw metal, and then use an oven 70 ℃ hot air drying; Co, Cr, Fe, Ni four elements are weighed and proportioned according to the equiatomic ratio for the preparation of alloys; the four raw materials are put into the vacuum electric arc furnace for melting, and the melting chamber is evacuated, when the vacuum degree up to 5.0×10 -2 After Pa,...

Embodiment example 2

[0033] (1) Use 1000-mesh and 2000-mesh sandpaper to polish the surface of the AZ91D magnesium alloy substrate in sequence, and then use the sandblasting process to roughen the surface of the substrate and remove surface impurities and oxides. The sandblasting pressure is 0.5MPa, and the sandblasting The time is 15s, the mesh number of the sand shot is 100-200 mesh, and finally the substrate for cold spraying is obtained.

[0034] (2) Use Co, Cr, Fe, Ni raw materials with a purity of more than 99.5%, use mechanical methods to remove the surface oxide scales of raw metal Co, Cr, Fe, Ni, and use industrial ethanol to ultrasonically clean the raw metal, and then use an oven 70 ℃ hot air drying; Co, Cr, Fe, Ni four elements are weighed and proportioned according to the equiatomic ratio for the preparation of alloys; the four raw materials are put into the vacuum electric arc furnace for melting, and the melting chamber is evacuated, when the vacuum degree up to 5.0×10 -2 After Pa,...

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Abstract

The invention provides a preparation method of a low-cost light-weight high-entropy alloy/aluminum oxide composite coating on the surface of a magnesium alloy. A high-entropy alloy is a CoCrFeNi alloy, alloy powder is prepared by gas atomization, the magnesium alloy is a magnesium alloy with different grade, and the high-entropy alloy powder is mixed with aluminum oxide particles by a mechanical method; and cold spraying gas is nitrogen, the distance between a base body and a spray gun is 10-25 cm, the moving speed of the spray gun is 50-250 mm/min, the powder feeding rate is 100-300 g/min, the carrier gas temperature is 400-600 DEG C, the carrier gas pressure is 2-5 MPa, and the spraying angle is 80-90 degrees. According to the preparation method of the low-cost light-weight high-entropy alloy/aluminum oxide composite coating on the surface of the magnesium alloy, the advantages of the high-entropy alloy and aluminum oxide are crossed and fused to the surface of the magnesium alloy, and the obtained composite coating is low in density, low in cost and excellent in corrosion resistance and wear resistance; and the preparation method is simple and convenient in process, suitable for mass production and suitable for protection and remanufacturing of magnesium alloy parts in the fields of automobile manufacturing, aerospace, rail transit and the like.

Description

technical field [0001] The invention belongs to the field of metal material processing and surface engineering, and relates to a method for preparing a low-cost light-weight high-entropy alloy / alumina composite coating on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy has many advantages such as low density, high specific strength and specific stiffness, good casting performance, easy cutting, strong damping and shock absorption, impact resistance, easy recycling and rich resources. It is the lightest metal structural material and is widely used in automobile manufacturing. , aerospace, rail transit and other modern industries have broad application prospects. However, there are two "bottlenecks" in magnesium alloys: (1) the electrode potential of magnesium alloys is very low, and the oxide film on the surface is loose and not dense, which makes the parts of magnesium alloys prone to large-scale corrosion damage; (2) the hardness of magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B22F9/08C22C1/02C22C30/00B22F1/00
CPCC23C24/04B22F9/082C22C1/02C22C30/00
Inventor 朱建朱敏张龙梅马玉林吴永玲郑宏宇葛文庆
Owner SHANDONG UNIV OF TECH
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