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Method for preparing surface protecting coating layer of light weight alloy

A light alloy and protective coating technology, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problem of poor corrosion resistance, wear resistance and oxidation resistance, and affecting service life, etc. question

Inactive Publication Date: 2013-07-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a light alloy surface protective coating, which solves the problems of poor corrosion resistance, wear resistance and oxidation resistance in the prior art, and affects the service life.

Method used

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  • Method for preparing surface protecting coating layer of light weight alloy
  • Method for preparing surface protecting coating layer of light weight alloy
  • Method for preparing surface protecting coating layer of light weight alloy

Examples

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Embodiment 1

[0052] In this embodiment, the grade of the light alloy is: magnesium alloy AZ31. First, a pure aluminum coating is prepared on the surface of the light alloy as the bottom layer of the protective coating; then, the surface of the pure aluminum coating is polished and anodized, and an aluminum oxide film is prepared on the surface of the pure aluminum coating as a protective coating the surface layer;

[0053] In this embodiment, the pure Al powder is directly sprayed on the surface of the light alloy by using a high-speed airflow, and by controlling the spraying parameters: the spraying distance is 30mm, the gas pressure is 3.0MPa, the gas temperature is 500°C, the air flow rate is 30g / s, and the powder particle size is 30μm, aluminum powder purity ≥ 99.8wt%, the compressed gas of the high-pressure gas source is helium. The pure aluminum powder is deposited on the surface of the light alloy, and a uniformly distributed pure aluminum coating is obtained on the surface of the ...

Embodiment 2

[0058] In this embodiment, the grade of the light alloy is: aluminum alloy 6063. First, a pure aluminum coating is prepared on the surface of the light alloy as the bottom layer of the protective coating; then, the surface of the pure aluminum coating is polished and anodized, and an aluminum oxide film is prepared on the surface of the pure aluminum coating as a protective coating the surface layer;

[0059] In this example, the pure Al powder is directly sprayed on the surface of the light alloy by using a high-speed airflow, and by controlling the spraying parameters: the spray distance is 5mm, the gas pressure is 1.0MPa, the gas temperature is 300°C, the air flow rate is 10g / s, and the average particle size of the powder is 5μm, the purity of aluminum powder is ≥99.8wt%, and the compressed gas of the high-pressure gas source is nitrogen. The pure aluminum powder is deposited on the surface of the light alloy, and a uniformly distributed pure aluminum coating is obtained o...

Embodiment 3

[0064] In this embodiment, the grade of the light alloy is: titanium alloy Ti751. First, a pure aluminum coating is prepared on the surface of the light alloy as the bottom layer of the protective coating; then, the surface of the pure aluminum coating is polished and anodized, and an aluminum oxide film is prepared on the surface of the pure aluminum coating as a protective coating the surface layer;

[0065] In this example, the pure Al powder is directly sprayed on the surface of the light alloy by using a high-speed airflow. By controlling the spraying parameters: the spraying distance is 20mm, the gas pressure is 2.0MPa, the gas temperature is 400°C, the air flow rate is 20g / s, and the average particle size of the powder is 20μm, aluminum powder purity ≥ 99.8wt%, the compressed gas of the high-pressure gas source is air. The pure aluminum powder is deposited on the surface of the light alloy, and a uniformly distributed pure aluminum coating is obtained on the surface of...

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Abstract

The invention relates to the field of surface coating protection and particularly relates to a method for preparing a surface protecting coating layer of a light weight alloy. The method comprises the steps of: firstly, preparing a pure aluminum coating layer on the surface of the light weight alloy in a cold spraying way by adopting pure Al or ultra-pure Al powder, wherein the pure aluminum coating layer serves as a bottom layer of the protecting layer; and secondly, performing surface polishing and anodic oxidizing on the pure aluminum coating layer to prepare an aluminum oxide thin film on the surface of the pure aluminum coating layer, wherein the aluminum oxide thin film serves as a surface layer of the protecting coating layer. After anodic oxidization, the aluminum oxide thin film with excellent properties can be generated on the surface of the pure aluminum coating layer, and the corrosion resistance of the thin film is far better than that of another aluminum oxide thin film which is formed after anodizing an aluminum alloy; and the coating layer is especially suitable to large-scale integrated circuit equipment, so that the equipment is maintained to be ultra-clean under the environments with strong corrosion and plasma compact. The light weight alloy is a magnesium alloy, a magnesium alloy or an aluminum alloy. The method is applicable to the magnesium alloy, the magnesium alloy and the aluminum alloy, and is capable of enhancing the corrosion resistance of the magnesium alloy, the magnesium alloy and the aluminum alloy.

Description

technical field [0001] The invention relates to the field of surface coating protection, in particular to a method for preparing a light alloy surface protection coating. Background technique [0002] Aluminum and magnesium are abundant in the earth, and their alloys have the characteristics of low density, high specific strength, specific stiffness, and high specific elastic modulus, and have good casting, electromagnetic shielding, shock absorption, electrical and thermal conductivity, and cutting processing. Therefore, it is widely used in automobile manufacturing, aerospace, communications, optical instruments, military industry and computer manufacturing and other fields. However, due to the low chemical stability of aluminum and magnesium, the electrode potential is very negative, and the corrosion resistance, wear resistance, hardness and high temperature resistance are poor, which to some extent restricts the wide application of their alloys. Therefore, if aluminum ...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C24/04C25D11/04
Inventor 吴杰吴敏杰金花子沈艳芳李鸣熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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