Investigation of a novel self-sealing pore micro-arc oxidation film on AM60 magnesium alloy  

作　　者：Yingwei Song Kaihui Dong Dayong Shan En-Hou Han 

机构地区：[1]State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,62 Wencui Road,Shenyang 110016,China

出　　处：《Journal of Magnesium and Alloys》2013年第1期82-87,共6页镁合金学报（英文）

基　　金：financial support by the National Natural Science Foundation of China(No.51171198);National Key Basic Research Program of China(No.2013CB632205);the International Science&Technology Cooperation Program of China(2011DFA50904).

摘　　要：Micro-arc oxidation(MAO)is one of the promising methods to improve the corrosion resistance of magnesium alloys.However,there are plenty of micro-pores in the traditional MAO films,deteriorating their protection property.A novel self-sealing pore MAO film was developed in this paper.The morphologies and chemical composition of the film were detected by scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDX).The corrosion behavior was investigated by electrochemical and salt spray tests.The possible film formation and corrosion mechanisms were proposed.The self-sealing pore film presents a blue appearance.Most of the micro-pores in the surface of the film are sealed during the film formation process.The chemical composition of the film mainly contains Mg,O,Ti,F and P.The self-sealing pore film exhibits better corrosion resistance compared with the traditional silicate film.Especially,the self-sealing pore film keeps intact after salt spray test for 2000 h,which can be attributed to its high compactness.

关 键 词：Self-sealing pore Micro-arc oxidation film Magnesium alloy Corrosion resistance 

分 类 号：TG1[金属学及工艺—金属学]