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Preparation method of composite coating on magnesium alloy plasma oxide ceramic surface

A technology of plasma oxidation and surface compounding, which is applied in the coating process of metal materials, devices for coating liquid on the surface, and coatings. It is not resistant to scratches and other problems, and achieves the effects of environmentally friendly energy consumption, high bonding strength, and strong anti-corrosion effect

Inactive Publication Date: 2012-10-03
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

However, the coating is generally thin, porous and has poor mechanical properties and is not scratch-resistant. It is easy to fall off in strong corrosive media and high-temperature and high-strength environments. Generally, it can only be used to protect metals for a short time and cannot be used for long-term protection.
[0005] Studies have shown that although there are many technologies that can be used to form protective coatings on the surface of magnesium alloys, it is difficult to achieve a high level of anti-corrosion and wear resistance of various processes, and the bonding force of the coating often becomes a limiting factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Material preparation: After AZ91D magnesium alloy is cut, polished and polished, use ultrasonic cleaning in acetone solution to remove oil, and then ultrasonic cleaning in deionized water to remove organic matter and impurities.

[0028] 2. Plasma oxidation: In the electrolyte, sodium hydroxide is 3g / L, sodium silicate is 15g / L, sodium phosphate is 10g / L, the rest is water, and the temperature is 50°C; the oxidation is carried out by pulse method, the pulse frequency is 1000Hz, and the current The density is 5A / dm 2 , the oxidation time is 40 minutes, the thickness of the oxide film is 30 μm, the oxide film is a porous ceramic film, the porosity is 40%, and the pore diameter is 5-10 μm.

[0029] 3. ABS resin spraying: ABS resin spraying is carried out on the surface of the sample after plasma oxidation, and the composition of the spraying liquid is: ABS resin 150g / L, and the solvent is dimethyl sulfoxide. The spraying process parameters are as follows: the powder pa...

Embodiment 2

[0035] The difference from Example 1 is:

[0036] 1. Material preparation: After AZ31B magnesium alloy is cut, polished and polished, use ultrasonic cleaning in acetone solution to remove oil, and then ultrasonic cleaning in deionized water to remove organic matter and impurities.

[0037] 2. Plasma oxidation: In the electrolyte, sodium hydroxide is 2g / L, sodium silicate is 10g / L, sodium phosphate is 5g / L, the rest is water, and the temperature is room temperature. Oxidation is carried out by pulse method, the pulse frequency is 1000Hz, and the current density is 2A / dm 2 , the oxidation time is 60 minutes, the thickness of the oxide film is 15 μm, the oxide film is a porous ceramic film, the porosity is 30%, and the pore diameter is 3-8 μm.

[0038] 3. Varnish spraying: varnish spraying is carried out on the surface of the sample after plasma oxidation, and the composition of the spraying liquid is: 200g / L of varnish, and the solvent is ether. The parameters of the spraying ...

Embodiment 3

[0044] The difference from Example 2 is:

[0045] 1. Material preparation: After cutting, grinding and polishing the ZM5 magnesium alloy, use ultrasonic cleaning in acetone solution to remove oil, and then ultrasonic cleaning in deionized water to remove organic matter and impurities.

[0046] 2. Plasma oxidation: In the electrolyte, the electrolyte contains 2g / L sodium hydroxide, 15g / L sodium silicate, 5g / L sodium phosphate, the rest is water, and the temperature is 30°C; the oxidation is carried out in a pulse mode, and the pulse frequency is 1500Hz, the current density is 8A / dm 2 , the oxidation time is 30 minutes, the thickness of the oxide film is 20 μm, the oxide film is a porous ceramic film, the porosity is 50%, and the pore diameter is 6-10 μm.

[0047] 3. Varnish spraying: varnish spraying is carried out on the surface of the sample after plasma oxidation, and the composition of the spraying liquid is: 200g / L of varnish, and the solvent is ether. The spraying proce...

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PUM

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Abstract

The invention relates to a preparation method of a composite coating consisting of an organic coating and a chemical coating on a magnesium alloy plasma oxide ceramic surface, belonging to the technical field of metal surface treatment. The method mainly comprises the following steps of: performing plasma anode oxidation on a magnesium alloy to form a porous ceramic layer; spraying ABS (Acrylonitrile Butadiene Styrene) resin or varnish; and forming a nickel-phosphorus clad layer by adopting chemical plating. In the method, the porous ceramic layer formed by performing plasma anode oxidation on the magnesium alloy is taken as a substrate, the hole sealing is performed by using an organic coating, and chemical plating is performed. A multi-layer composite film layer prepared with the method has enough protective thickness, the coating has high bonding force with the substrate and high hardness, and the protective requirements of scraping resistance and corrosion resistance on a magnesium alloy are met effectively.

Description

technical field [0001] The invention relates to a composite coating method for preparing an organic coating-electroless coating on the surface of a magnesium alloy plasma anodized ceramic membrane, and belongs to the technical field of metal surface treatment. Background technique [0002] Magnesium alloys have high specific strength, specific stiffness, and good damping properties. They are the most potential metal structural materials for the development of automobile lightweight, environmental protection, and performance optimization. They are also the most promising metal materials in the 21st century. one. However, due to the poor thermodynamic stability of magnesium and the loose oxide (film) structure, the corrosion resistance of magnesium alloys is poor, which limits its wide application to a large extent. Therefore, the surface treatment of magnesium alloys is very important in practical applications. There are many methods of surface modification, such as electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C25D11/30B05D7/14B05D7/16C23C18/36
Inventor 杜克勤张伟王福会严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI