一种AZ80铸造镁合金用高效微弧氧化工艺  

An Efficient Micro-arc Oxidation Technology for AZ80 As-cast Magnesium Alloy

作　　者：周吉学 陈燕飞 宋晓村 刘洪涛 王美芳 杨院生[2] ZHOU Jixue;CHEN Yanfei;SONG Xiaocun;LIU Hongtao;WANG Meifang;YANG Yuansheng(Advanced Materials Institute,Qilu University of Technology（Shandong Academy of Sciences）,Jinan 250014,China;Institute of Metal Research Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院新材料研究所,济南250014 [2]中国科学院金属研究所,沈阳110016

出　　处：《腐蚀与防护》2018年第11期860-866,共7页Corrosion & Protection

基　　金：国家重点研发计划课题(2016YFB0301105);国家重点研发计划(2017YFB0103904);山东省重点研发计划项目(2016ZDJS02A09)

摘　　要：开发了一种适用于AZ80铸造镁合金的高效微弧氧化处理方法和相关的电解液,可将传统的微弧氧化处理时间缩短至3min,且能够在AZ80镁合金表面制备出一层耐蚀性良好的氧化物陶瓷膜。利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)等对AZ80镁合金表面的氧化物陶瓷膜结构进行了表征;并利用盐雾腐蚀试验、电化学试验等研究了陶瓷层的耐蚀性及其腐蚀过程。结果表明:经过3min微弧氧化处理后,AZ80镁合金表面形成了6μm厚的氧化物陶瓷膜,其主要成分为氧化镁、硅酸镁和偏铝酸镁;覆盖氧化物陶瓷膜的AZ80镁合金的耐蚀性与基体相比提高了超过4个数量级,且在长周期5%中性盐雾腐蚀试验中表现出良好的耐蚀性。A highly efficient micro-arc oxidation treatment method and relevant electrolyte were developed for AZ80 as-cast magnesium alloy. The traditional micro-arc oxidation treatment time was shortened to 3 rain, and an oxide ceramic film with good corrosion resistance was prepared on the surface of AZ80 magnesium alloy. The structure of oxide ceramic membrane on the surface of AZ80 magnesium alloy was characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD）. The corrosion resistance and corrosion process of the ceramic layer were studied by salt spray corrosion test and electrochemical test. The results showed that after 3 rain micro-arc oxidation treatment, a 6 μm thick ceramic film was formed on the surface of AZ80 magnesium alloy, and the main components of the film were magnesia, magnesium silicate and magnesium metaaluminate. The corrosion resistance of the AZ80 magnesium alloy covered by a ceramic oxide film was improved by more than 4 orders of magnitude compared with the matrix, and exhibitted good corrosion resistance in the longperiod 5% neutral salt spray corrosion test.

关 键 词：微弧氧化 镁合金 氧化膜 陶瓷层 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]