Preparation method of micro-arc oxidation black film layer doped with rare earth salt and graphene

A micro-arc oxidation and black film technology, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of weak adhesion between the black ceramic film and the substrate, low hardness of the coating, easy fading, etc. Achieve the effect of changing electrical conductivity, increasing corrosion potential, and wide application range

Inactive Publication Date: 2021-10-19
XI'AN PETROLEUM UNIVERSITY
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AI Technical Summary

Problems solved by technology

The existing magnesium alloy coloring technology mainly stays in the anodizing stage. The black ceramic film prepared by the traditional anodizing technology has weak bonding force with the substrate, and the coating has low hardness and is easy to fade

Method used

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  • Preparation method of micro-arc oxidation black film layer doped with rare earth salt and graphene

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Embodiment 1

[0021] Such as figure 1 As shown, in this embodiment, a corrosion-resistant, dense and uniform black micro-arc oxidation film is formed in situ on the magnesium alloy base metal.

[0022] In this embodiment, the material of the metal base is AZ91D magnesium alloy.

[0023] In this embodiment, the components that improve the surface corrosion resistance of the AZ91D magnesium alloy are MgO and Mg with a spinel structure 2 SiO 4 , the material that appears black on the surface is MnO 2 .

[0024] In this embodiment, the thickness of the black micro-arc oxidation film is 0-20 μm.

[0025] combine figure 1 , a preparation method of a black micro-arc oxidation film layer, comprising the following steps:

[0026] Step 1: Use 200#, 400#, 600#, 800#, 1000# sandpaper to polish the AZ91D magnesium alloy with a sample size of 50mm×50mm×2mm, so that the surface of the magnesium alloy is smooth and the direction of the scratches appears to be consistent. Clean the surface with aceto...

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Abstract

The invention provides a preparation method and application for preparing a black micro-arc oxidation film layer on the surface of an AZ91D magnesium alloy doped with rare earth salt and graphene. The preparation method mainly comprises the following steps that (1), the surface of a magnesium alloy matrix is polished through abrasive paper till the surface of the magnesium alloy matrix is smooth, and cleaning and oil removing are conducted through acetone; (2), the surface of the matrix is cleaned with deionized water, and blow-drying is conducted; and (3), a bipolar pulse power supply is adopted, and an adopted electrolyte formula comprises 5-15g / L of Na2SiO3, 1-10g / L of NaOH, 5-10g / L of EDTA (Ethylene Diamine Tetraacetic Acid), 1-10g / L of KMnO4, 0-1g / L of La (NO3)3 and 0-1g / L of graphene; and proper electrical parameters and non-electrical parameters are adjusted, and the black micro-arc oxidation film layer is prepared on the surface of the metal matrix. The corrosion resistance and the wear resistance of the black micro-arc oxidation film layer prepared by the method are greatly improved, the binding force of the black film layer and the magnesium alloy is enhanced, and the generated black film layer is hard, uniform and compact in texture.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a preparation method of a micro-arc oxidation black film layer on the surface of an AZ91D magnesium alloy and anticorrosion of the magnesium alloy. Background technique [0002] With the development of technology, metals are more and more widely used in industry and daily life. Because magnesium has the characteristics of low density and good toughness, magnesium alloy has great application potential and economic value. It is widely used in the production of aircraft , spaceships, satellites, etc. However, due to the low potential of magnesium metal, magnesium is easily corroded and has a single color, which is difficult to meet the needs of modern people's production and life. It is important to in-situ generate a uniform color and corrosion-resistant dense film on the surface of AZ91D magnesium alloy by micro-arc oxidation technology. It is an effective m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C25D21/02
CPCC25D11/026C25D11/30C25D11/024C25D21/02
Inventor 姚建洮关可心高成
Owner XI'AN PETROLEUM UNIVERSITY
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