北京航空航天大学学报 ›› 2001, Vol. 27 ›› Issue (5): 495-498.

• 论文 •    下一篇

铝合金阳极化膜上铈转化膜沉积的电化学研究

李国强, 李荻, 郭宝兰, 彭明霞   

  1. 北京航空航天大学 材料科学与工程系
  • 收稿日期:2000-01-26 出版日期:2001-05-31 发布日期:2010-09-27
  • 作者简介:李国强(1971-),男,江西黎川人,博士生,100083,北京.
  • 基金资助:

    国家自然科学基金资助项目(59771067); 航空基础科学基金资助项目(97H51077)

Electrochemical Investigation of Cerium Conversion Coatings Deposited on Porous Film of Anodized Aluminum

LI Guo-qiang, LI Di, GUO Bao-lan, PENG Ming-xia   

  1. Beijing University of Aeronautics and Astronautics, Dept. of Materials Science and Engineering
  • Received:2000-01-26 Online:2001-05-31 Published:2010-09-27

摘要: 阳极氧化膜在含1g/L CeCl3和2.7?g/L H2O2的水溶液中阴极电解可以在其表面沉积富铈转化膜.用循环伏安、φ-t和j-t曲线等电化学测试方法对转化膜成膜反应进行了研究,以期获得对成膜机理的深入了解和证实根据其它工作提出的成膜机理.研究结果表明铈转化膜的生成包括阳极氧化膜的化学溶解和4价铈化合物的电化学还原两个过程;在阴极电位达到析氢电位之前,这两个过程主要是由H2O2在阴极的电还原改变了阴极表面附近溶液的局部pH值引起的,而O2的还原通常不能引起这两个过程的发生.

Abstract: Cerium-rich conversion coatings was deposited on porous film of anodized aluminum by cathodic electrolysis in a solution containing 1g/L CeCl3·7H2O and 2.7g/L H2O2. Electrochemical and chemical reactions related with coating formation were studied using electrochemical methods such as cyclic voltammetry, φ-t  curve and j-t  curve tests. It was revealed that the formation of cerium conversion coatings involves a chemical dissolution process of anodized film and an electroreduction process of 4-valent-state cerium compound. Reduction of H2O2 was considered to be the major factor responsible for the occurrence of the two processes, by changing the local pH at surface of anodized film before cathodic potential reached up to hydrogen evolution potential. While the reduction of O2 was unable to trigger the occurrence of the above processes.

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