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Method of increasing content of magnetic powder in magnesium alloy micro-arc oxidation membrane

A magnetic powder, micro-arc oxidation technology, applied in anodizing, electrolytic coatings, coatings, etc., can solve the problems of small compounding amount of powder and insignificant effect, etc., to increase compounding amount, improve corrosion resistance, increase Effects in the field of application

Inactive Publication Date: 2015-01-28
SHENYANG LIGONG UNIV
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AI Technical Summary

Problems solved by technology

In the preparation of existing powder composite micro-arc oxidation film, the composite amount of powder is small and the effect is not obvious

Method used

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Embodiment Construction

[0015] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0016] (1) After the magnesium alloy is degreasing, the surface is cleaned with deionized water and dried;

[0017] (2) Put the cleaned magnesium alloy into an electrolytic tank with a magnet at the bottom, add magnetic powder (metallic nickel powder) to the electrolyte in the electrolytic tank, stir the electrolyte to make the magnetic powder evenly covered The surface of the magnesium alloy substrate;

[0018] (3) Micro-arc oxidation treatment is carried out on the magnesium alloy uniformly covering the magnetic powder, the treatment time is 1530min, and the micro-arc oxidation electrolyte is: 20g / L sodium silicate, 10g / L sodium fluoride;

[0019] (4) Cleaning: clean the magnesium alloy after micro-arc oxidation treatment with deionized water;

[0020] (5) Drying: Dry the cleaned magnesium alloy to obtain a magnetic powder composite micro-arc oxidation ceramic fil...

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Abstract

The invention relates to a preparation method of a magnesium alloy with corrosion resistance in the surface and a functional protective layer on the surface, in particular to a method of increasing content of magnetic powder in a magnesium alloy micro-arc oxidation membrane, belongs to the technical field of surface processing. The method comprises the following steps: putting a magnesium alloy matrix in an electrolytic bath with a magnet arranged at the bottom firstly, adding the magnetic powder in electrolyte in the electrolytic bath, enabling the magnetic powder to uniformly cover the electrolyte, then adopting a micro-arc oxidation method to compound a ceramic membrane on the surface of the magnesium alloy, and forming a composite micro-arc oxidation ceramic membrane which is uniformly covered by the magnetic powder on the surface of the magnesium alloy, wherein the composite membrane layer is capable of reducing the number of micropores and cracks on the surface of the micro-arc oxidation membrane layer and improving corrosion resistance of the magnesium alloy. According to the method disclosed by the invention, the micro-arc oxidation membrane is enabled to have a magnetic function, by virtue of the magnet arranged at the bottom of the outer side of the electrolytic bath, the magnetic powder enters the oxidation membrane through a micro-arc oxidation fusion and discharge channel under the effect of magnetism, so that compound quantity of the magnetic powder in the micro-arc oxidation membrane is increased, the micro-arc oxidation membrane can more reflect the functions of the magnetic powder of electromagnetic wave absorption and shielding, and the application field of the micro-arc oxidation coating is widened.

Description

Technical field [0001] The invention relates to a method for preparing a corrosion-resistant and functional protective layer on a magnesium alloy surface, in particular to a method for increasing the content of magnetic powder in a magnesium alloy micro-arc oxidation film, which belongs to the technical field of surface treatment. technical background [0002] Magnesium alloys are characterized by their low density, high specific strength and specific rigidity, excellent machining performance and castability, good damping and shock absorption, high thermal conductivity, high dimensional stability, excellent electromagnetic shielding performance and Recycling and other excellent properties are considered to be the green materials with the most development and application potential in the 21st century. However, the low corrosion resistance of magnesium alloys limits its application. [0003] Micro-arc oxidation is a new technology that directly grows ceramic layers on the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C25D15/00
CPCC25D11/30C25D15/00
Inventor 邵忠财孔冰张弘
Owner SHENYANG LIGONG UNIV
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