电流密度对镁合金微弧氧化膜层性能的影响

Influence of Current Density on Properties of Microarc Oxidation Coatings of Magnesium Alloy

在电流密度分别为3、6、9、12 A/dm2时,用微弧氧化的方法在碱性电解液体系中制备了镁合金微弧氧化膜,考察了不同电流密度对生成的氧化膜层厚度、硬度的影响规律;用XRD分析了氧化膜层的相结构;并采用NaCl溶液浸泡试验和中性盐雾试验,考察了氧化膜的耐蚀性能。结果显示:随着电流密度的增大,膜层的厚度、硬度均呈增加的趋势;陶瓷层主要由MgO、Mg2SiO4和非晶相组成;得到的氧化膜层具有优良的耐蚀性能。

Oxide coatings of magnesium alloy were prepared by microarc oxide at different current density （3,6,9,12A/dmz） in alkaline electrolyte solution. The influence of current density on thickness and hardness of coatings were investigated. The phase structure was analyzed by X-ray diffraction （XRD）, and the corrosion resisting property was also measured by soak test in NaCl solution and neutral salt spray test. It is found that the thickness and the hardness increase with the current density increasing. The coating is mainly composed of MgO and MgaSiO4,and has good corrosion resisting property.