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Cold spraying preparation method of corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on magnesium alloy surface

A technology of magnesium alloy and base metal, which is applied in the field of cold spraying preparation of corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on the surface of magnesium alloy, can solve the problems of high cost, clogging of spray gun, poor controllability of spraying process, etc. The effect of bond strength, excellent corrosion resistance

Active Publication Date: 2018-08-10
XUZHEN NEW ENERGY TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is usually necessary to use expensive helium as an accelerating gas (about 50 times that of nitrogen) to significantly increase the speed of particles, which is extremely expensive and limits industrial mass production.
Significantly increasing the temperature of the particles will cause the transitional softening of these low melting point metals, and then deposit on the inner wall of the spray gun, resulting in clogging of the spray gun, poor controllability of the spraying process, and difficulty in continuous spraying production

Method used

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  • Cold spraying preparation method of corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on magnesium alloy surface
  • Cold spraying preparation method of corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on magnesium alloy surface
  • Cold spraying preparation method of corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1100Al powder with a particle size of 10-50 μm is used as the spraying material, and 316 stainless steel particles with a particle size of 200-300 μm are used as hard particles. The hardness of 1100Al and 316 stainless steel is about 25HV and 274HV respectively. Such as figure 1As shown, (a) is aluminum powder; (b) is 316 stainless steel hard particles; 1100Al powder is spherical and ellipsoidal in shape, and 316 stainless steel hard particles are spherical in shape. 40vol.% of hard particles were mechanically mixed with 1100Al powder as spray powder. AZ31 magnesium alloy is used as the base material, and the base is subjected to acetone ultrasonic cleaning and sandblasting surface roughening before spraying. Nitrogen was used as the working gas, and the gas pressure and gas temperature were set to 2.0 MPa and 200°C, respectively. The control sample is a coating prepared with pure 1100Al powder under the same spraying parameters.

[0041] The cross-sectional structu...

Embodiment 2

[0044] Zn5%Al powder with a particle size of 15-50 μm is used as the spraying material, and 430 stainless steel particles with a particle size of 150-300 μm are used as hard particles. 50vol.% of hard particles were mechanically mixed with pure Al powder as spraying powder. AZ31 magnesium alloy is used as the base material, and the base is subjected to acetone ultrasonic cleaning and sandblasting surface roughening before spraying. Nitrogen was used as the working gas, and the gas pressure and gas temperature were set at 1.8 MPa and 250°C, respectively. The test results show that there are a lot of pores in the coating prepared by using a single Zn5%Al powder, and the image analysis results show that the porosity of the coating is as high as 10.7%. No obvious pores were found inside the Zn5%Al coating deposited by mixed powder, and the image analysis results showed that the porosity of the coating was only 0.4%. Electrochemical test results show that the self-corrosion poten...

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Abstract

The invention discloses a cold spraying manufacturing method for an anticorrosive aluminum base or a zinc-aluminum base metal coating on a magnesium alloy surface and belongs to the field of the material surface engineering technology and mechanical manufacturing. The method includes the following steps that firstly, aluminum base or zinc-aluminum base metal powder is mixed with hard metal powder so as to manufacture mixed powder for cold spraying; and secondly, a cold spraying process is adopted, the mixed powder is sprayed to a pretreated magnesium alloy matrix, and the anticorrosive aluminum base or zinc-aluminum base metal coating is manufactured on the surface of the magnesium alloy matrix. By the adoption of the method, the grain speed and the deposition temperature do not need to be remarkably improved, operation is easy, a sedimentary body manufactured through the method is more excellent in electric conductivity and thermal conductivity and higher in corrosion resistance, abrasion resistance and mechanical performance, and therefore the method can be widely applied for manufacturing coatings with high electric conductivity, thermal conductivity, corrosion resistance and abrasion resistance or workpieces with the high mechanical performance.

Description

technical field [0001] The invention belongs to the field of material surface engineering technology and mechanical manufacturing, and in particular relates to a preparation method for cold spraying of a corrosion-resistant aluminum-based or zinc-aluminum-based metal coating on the surface of a magnesium alloy. Background technique [0002] As a metal structural material, magnesium alloy has many excellent properties: low density (1.8g / cm 3 ), only 2 / 3 of aluminum, 1 / 4 of iron; specific strength and specific stiffness; good shock absorption performance, can withstand greater impact load than aluminum alloy, suitable for parts that withstand severe vibration; soft, Easy cutting processing, etc. These advantages of magnesium alloy make it widely used in aerospace, automobile industry, electronic communication and other fields, and has a very good prospect. However, as a structural material, the poor corrosion resistance of magnesium alloys limits its use in various environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04
CPCC23C4/06C23C4/08C23C4/12
Inventor 雒晓涛李长久魏瑛康
Owner XUZHEN NEW ENERGY TECH (SHANGHAI) CO LTD
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