镁合金微弧氧化过程中不同电压下获得膜层的性能研究

被引:23
作者
王燕华
王佳
张际标
机构
[1] 中国科学院海洋研究所
[2] 中国海洋大学
[3] 中国科学院海洋研究所 青岛
[4] 中国科学院研究生院北京
[5] 青岛
[6] 金属腐蚀与防护国家重点实验室沈阳
关键词
微弧氧化; 镁合金; 电压; 性能; 阻抗;
D O I
暂无
中图分类号
TG174.4 [金属表面防护技术];
学科分类号
080503 ;
摘要
采用扫描电镜、电化学阻抗方法,研究了镁合金AZ91D微弧氧化过程中不同电压下获得氧化膜的性能.结果表明,随着氧化电压的升高,可以获得三种不同性能的氧化膜:钝化膜、微火花氧化膜和弧光氧化膜.钝化膜很薄,厚度不足1μm,膜层的阻抗随着氧化电压升高略有增加,仍属于钝化膜性质;微火花放电后期得到的膜层较厚,厚度可达30μm,表面均匀、结构致密,具有最高的阻抗,可以达到8×107Ω;弧光放电阶段氧化膜最厚,但结构疏松、易碎,阻抗逐渐降低至1×107Ω.结果还指出,硅酸盐体系中微火花放电阶段后期形成的膜层具有最佳的性能;而且膜层的阻抗主要由氧化膜的有效厚度决定,与总厚度关系不大.
引用
收藏
页码:267 / 270
页数:4
相关论文
共 8 条
[1]  
Rama Krishna L,Somaraju K R C,Sundararajan G.The tribological performance of ultra - hard ceramic composite coatings obtained through microarc oxidation. Surface and Coatings Technology . 2003
[2]  
Zhang Yongjun,Yan Chuanwei,Wang Fuhui,et al.Study on the environmentally friendly anodizing of AZ91D magnesium alloy. Surface and Coatings Technology . 2002
[3]  
Hoche H,Scheerer H,Probst D,et al.Plasma anodisation as an environmental harmless method for the corrosion protection of magnesium alloys. Surface and Coatings Technology . 2003
[4]  
Goeminne G,Terryn H,Vereecken J.Characterisation of conversion layers on aluminum by means of electrochemical impedance spectroscopy. Electrochimica Acta . 1995
[5]  
Yerokhin A L,Voevodin A A,Lyubimov V V,et al.Plasma electrolytic fabrication of oxide ceramic surface layers for tribotechnical purposes on aluminium alloys. Surface and Coatings Technology . 1998
[6]  
Schram T,Goeminne G,Terryn H,et al.Study of the composition of zirconium-based chromium free conversion layers on aluminum. Trans. Inst. Metal Finishing . 1995
[7]  
Sundararajan G,Rama Krishna L.Mechanisms underlying the formation of thick alumina coatings through the MAO coating technology. Surface and Coatings Technology . 2003
[8]  
Butyagin P I,Khokhryakov Ye V,Mamaev A I.Microplasma systems for creating coatings on aluminium alloys. Materials Letters . 2003