Purpose

The purpose of this paper is to prepare composite micro-arc oxide coatings with better wear resistance and corrosion resistance.

Design/methodology/approach

A nickel powder composite micro-arc oxide film was prepared on the surface of the magnesium alloy by the method of organically combining ultra-fine Ni powder with micro arc oxidation film layer. In this experiment, the changes in the corrosion resistance and microstructure of the composite film layer after adding Ni powder were studied, and the effect of the addition of glycerin on the corrosion resistance of the film layer was analyzed.

Findings

The results show that the ultra-fine nickel powder was successfully prepared by the liquid phase reduction method, and the micro-arc oxidation process was modified under the optimal addition amount. The surface of the micro-arc oxide film made of ultra-fine nickel powder was found by SEM to have smooth surfaces and few holes. According to X-ray diffraction analysis, the phase composition of the micro-arc oxide film layer was Mg, Ni, NiSiO₄, MgNi (SiO₄) and Mg₂SiO₄. According to the results of electrochemical tests, the corrosion resistance of the micro-arc oxidation composite film layer was improved after the addition of ultra-fine Ni powder, the corrosion current was greatly reduced and the impedance has been improved. And after adding glycerin, the surface of the film layer becomes denser, and the corrosion resistance of the micro-arc oxide film is significantly improved.

Originality/value

Through this experimental research, a micro-arc oxide coating of powder composite magnesium alloy was successfully prepared. The corrosion resistance of the micro-arc oxidation film layer has been improved, and certain functions had been given to the micro-arc oxidation composite film, which has increased the application field of magnesium alloys.

中文翻译：

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磁性金属粉末复合镁合金微弧氧化涂层的研究

目的

本文的目的是制备具有更好的耐磨性和耐腐蚀性的复合微弧氧化物涂层。

设计/方法/方法

通过将超细镍粉与微弧氧化膜层有机结合的方法，在镁合金表面制备了镍粉复合微弧氧化膜。在该实验中，研究了添加镍粉后复合膜层耐蚀性和微观结构的变化，并分析了添加甘油对膜层耐蚀性的影响。

发现

结果表明，采用液相还原法成功制备了超细镍粉，并在最佳添加量下对微弧氧化工艺进行了改性。通过SEM发现由超细镍粉制成的微弧氧化膜的表面具有光滑的表面和少的孔。根据X射线衍射分析，微弧氧化膜层的相组成为Mg，Ni，NiSiO ₄，MgNi（SiO ₄）和Mg ₂ SiO _4。。根据电化学测试结果，加入超细镍粉后，微弧氧化复合膜层的耐蚀性得到提高，腐蚀电流大大降低，阻抗得到改善。并且，在添加甘油之后，膜层的表面变得致密，并且微弧氧化膜的耐腐蚀性显着提高。

创意/价值

通过该实验研究，成功制备了粉末复合镁合金微弧氧化膜。改善了微弧氧化膜层的耐蚀性，并赋予了微弧氧化复合膜一定的功能，增加了镁合金的应用领域。