摘要
在优化的铝酸钠-磷酸钠复合电解液体系中,以ZK60镁合金为研究对象进行微弧氧化实验,并结合电压-时间曲线和微弧氧化各个阶段膜层的微观形貌以及物相分析等方面对复合电解液体系中微弧氧化过程及成膜机理进行了探讨。结果表明,该体系下微弧氧化过程分为了氧化膜生成阶段、微弧氧化膜层快速生长阶段和电压微小下降过程以及微弧氧化膜层的修整阶段。膜层的物相分析表明微弧氧化初期膜层主要成分为MgO,Mg和MgZn2,中后期膜层中的主体相为尖晶石结构的MgAl2O4和方镁石结构的MgO,微弧氧化的最后阶段对膜层的物相组成没有影响。
Micro-arc oxidation(MAO) process was carried out in an optimized dual electrolyte system to fabricate a compact,smooth and corrosion resistant coating on ZK60 Mg alloy.The micro-arc oxidation mechanism was investigated by voltage-time curve and microstructure coupled with XRD.The results show that the optimized micro-arc oxidation coating growth process is divided into four stages:anodic oxidation stage,micro-arc oxidation stage,voltage dropping stage and tiny spark discharge stage.Compositional analysis indicates that the coating is mainly composed of MgO,Mg and MgZn2in anodic oxidation stage,Spinel phase(MgAl2O4) and Periclase(MgO) are the main phases in the intermediate stages while the last stage has no effect on phase composition of the micro-arc oxidation coating.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第4期198-201,共4页
Transactions of Materials and Heat Treatment
基金
江苏省先进焊接技术重点实验室基金(JSAWT-11)
关键词
镁合金
复合电解液
微弧氧化
机理
magnesium alloy
dual electrolyte system
micro-arc oxidation
mechanism
