AZ91D镁合金的微弧氧化陶瓷层电化学腐蚀行为研究
Study on Electrochemical Corrosion Behaviour of Micro-arc Oxidation Film on AZ91D Alloy
王文礼
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作者单位:西安建筑科技大学 冶金工程学院, 陕西 西安 710055
中文关键字:电化学腐蚀; 微弧氧化; 压铸镁合金
英文关键字:electrochemical corrosion; micro-arc oxidation; casting Mg alloy
中文摘要:利用微弧氧化技术对AZ91D镁合金在铝酸盐和锆盐溶液中进行表面陶瓷化处理。采用IM6e型电化学工作站,对微弧氧化镁合金进行电化学稳态电流/电位极化曲线测量以及塔费尔斜率测量。通过电化学测量对微弧氧化镁合金的腐蚀行为进行分析。结果表明:镁合金经微弧氧化处理后,点蚀的发生受到限制,镁合金微弧氧化试样的腐蚀电流较原始试样降低4~6个数量级。镁合金微弧氧化试样的耐蚀等级均达到耐蚀以上的等级。
英文摘要:The micro-arc oxidation film on AZ91D Mg alloy in the different solutions as aluminates and zirconate was studied by measuring the steady state I/E recording and Tafel slope coefficient with an IM6e electrochemical active station. The corrosion behavior of the film was also analyzed. The results indicate that the micro-arc oxidation films protect the AZ91D magnesium alloy against spot corrosion, and that the corrosion current reduces obviously. The corrosion resisting property of the AZ91D Mg alloy improves visibly.