镁合金微弧氧化工艺条件对陶瓷膜耐蚀性的影响  

Effect of Operating Condition on Corrosion Resistance of Ceramic Coatings Formed on Magnesium Alloys by Micro-arc Oxidation

作　　者：郭洪飞[1] 安茂忠[1] 徐莘[1] 霍慧彬[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《材料工程》2006年第3期29-32,36,共5页Journal of Materials Engineering

摘　　要：利用交流阻抗研究了微弧氧化电解液组分及浓度、电流密度、处理时间等对镁合金氧化陶瓷膜于3.5%(质量分数,下同)NaCl溶液中的耐蚀性的影响规律,同时对经不同浸泡时间时氧化陶瓷膜的耐蚀性进行了测试,以探讨氧化膜的耐蚀机理。研究得出:随着硅酸钠、氟化钠、甘油含量的增加以及微弧氧化电流密度的增大和处理时间的延长,微弧氧化陶瓷膜的耐蚀性均呈现出先增强后降低的趋势;经一定的腐蚀时间后,微弧氧化陶瓷膜的多孔层最终遭到破坏,而紧密层对防腐蚀起着至关重要的作用。Effect of constituents and concentration of electrolyte, current density and treatment time on corrosion resistance of ceramic coatings on magnesium alloys was investigated in 3.5 % NaCl solution by electrochemical impedance spectroscopy （EIS）, the EIS results for different immersion time of ceramic coatings were also discussed to analyze the corrosion mechanism. The results indicated that, the corrosion resistance of ceramic coatings is improved when the concentration of electrode, current density as well as treatment time increase, however it decreases when they increase further. The outer porous layer is damaged after corrosion, while the inner dense layer played a key role to protect the coating from corrosion.

关 键 词：镁合金 微弧氧化 耐蚀性 交流阻抗 

分 类 号：TG174.451[金属学及工艺—金属表面处理] TQ028.8[金属学及工艺—金属学]