镁合金等离子体微弧氧化膜层研究

研究了镁合金AZ31在磷酸盐和硅酸盐两种不同的溶液体系下生成氧化膜的性质,比较了多种因素,特别是负电压对于生成氧化膜的影响;并且通过X射线衍射(XRD)等方式分别确定了两种不同溶液条件下氧化膜的成分.结果表明:较低的负电压有利于氧化膜的生长,延缓二次放电现象的发生.在我们得到的氧化膜中,最主要的成分为高温相的MgO,不同于以往条件下得到的普通相MgO氧化膜,能提高镁合金的一部分性能.

Research on Oxide Films Formed by Microplasma Oxidation on Magnesium Alloy

The properties of microplasma oxidation films on AZ31 magnesium alloy formed in phosphate electrolyte and silicate electrolyte were analyzed. The factors of the oxide film quality were considered, especially the influence of applied negative potential was emphasized. The phase constituents of films formed in both electrolytes which were performed by X-ray diffraction. It is found that the lower negative voltage is beneficial to the growth of oxide films, and also delays the presence of the second microarc discharge phenomenon. The oxide film deposited under the lower negative voltage is mainly composed of high-temperature MgO phase, which is different from the normal MgO oxide film. The corrosion resistance of the oxide film under the lower negative potential is further improved.