MB26镁合金微弧氧化陶瓷膜层性能

文摘利用扫描电镜、表面性能测试仪和电化学测试技术等研究了在铝酸盐电解液中,不同电流密度和氧化时间对MB26镁合金微弧氧化膜的表面形貌、厚度、结合力以及耐蚀性等性能的影响。结果表明:随氧化时间和电流密度的增加,MB26镁合金微弧氧化膜层中的微孔数量减少,但孔变深。膜层厚度随氧化时间和电流密度的增加而线性增加,但与基体的结合力随之降低。氧化膜的耐蚀性随氧化时间和电流密度的增加呈先增加而后减小的趋势,该合金在铝酸盐体系中微弧氧化的最佳工艺为电流密度0.2 A/cm2,氧化时间40 m in。

Properties of Microarc Oxide Films of Magnesium Alloy MB26

Magnesium alloy MB26 was microarc oxidized in aluminate system under different processing time and different current density.Surface morphology,elements,adhesion force and corrosion resistance were investigated by scanning electron microscopy,surface performance apparatus and electrochemical testing methods,and the effects of different processing parameters on quality of microarc oxide films were also investigated.The results indicate that with the increasing of time and current density,the amount of micropores in the microarc oxide film decreases,but the depth of micropores of the film increases.With the increasing of time and current density,thickness of microarc oxide films linearly increases,but adhesion force decreases,while the corrosion resistance increases firstly and then decreases.The optimlized processing parameters for magnesium alloy MB26 in aluminate system are 40 min and 0.2 A/cm2.