AZ91D镁合金无铬铈盐转化膜的正交试验研究  

An orthogonal experiment on the non-chromate Ce-based chemical conversion coating of AZ91D magnesium alloy

作　　者：陈东初[1] 吴桂香[2] 李炜常[1] 李文芳[2] 梁奕清 

机构地区：[1]佛山科学技术学院理学院,广东佛山528000 [2]华南理工大学机械工程学院材料研究所,广东广州516640 [3]广东兴发集团广东省有色金属重点工程研究中心,广东佛山528000

出　　处：《轻合金加工技术》2007年第6期43-47,56,共6页Light Alloy Fabrication Technology

基　　金：佛山市科技发展专项基金项目(2005040153);华南理工大学博士后启动基金

摘　　要：为了代替剧毒Cr6+化学转化膜处理工艺,采用硝酸铈以及高锰酸钾为无铬化学转化处理液的主要成膜成分,通过正交试验优化了以Ce(NO3)3为主盐的镁合金铈盐化学转化膜工艺,并对成膜规律进行了研究。试验表明,本工艺所获得的铈盐化学转化膜具有优良的外观和良好的耐腐蚀性。此外,借助扫描电镜分析手段对转化膜的微观形貌进行了分析,还对氧化膜成膜机制进行了探讨。In order to development an environmental friendly surface coating technology for magnesium alloy, an orthogonal experi- ment was designed to optimize the chrome-free Ce-based process to form a conversion coating on AZ91D Mg.The effect of preparing parameters on the coating growth and the anti-corrosion performance of the formed coating was summarized. The results show that the film has not only good appearance but also good anti-corrosion performance. Through SEM micro-analysis and electro-chemical experiment, chemical conversion coatings＇ morphology and the coating formation mechanism were studied.

关 键 词：镁合金 铈盐 转化膜 无铬 

分 类 号：TG174.45[金属学及工艺—金属表面处理]