The influence of adsorbed oxo-Cr(VI) species on the zeta potential in the porous oxide of anodized aluminum

被引：27

作者：

Kendig, M ^{[1
]}

Addison, R ^{[1
]}

Jeanjaquet, S ^{[1
]}

机构：

[1] Rockwell Sci Ctr LLC, Thousand Oaks, CA 91358 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1999年 / 146卷 / 12期

关键词：

D O I：

10.1149/1.1392653

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A novel acoustic method has been used to characterize the zeta potential and potential of zero charge in the pores of sulfuric acid anodized aluminum as a function of pH and concentration of oxo-chromium(VI) compounds (those containing anions of chromate and dichromate). The results show that aqueous solutions of oxo-chromium(VI) at a concentration of 0.01 M substantially lower the zeta potential of the internal surface of aluminum oxide pores without irreversibly adsorbing as the Cr(lll) oxide. It remains as the adsorbed but otherwise soluble oxo-Cr(VI) moiety. This explains in part the corrosion inhibition of anodized aluminum by oxo-Cr(VI) compounds, since such a change in zeta potential discourages adsorption by Cl-. (C) 1999 The Electrochemical Society. S0013-4651(99)03-115-8. All rights reserved.

引用

页码：4419 / 4423

页数：5

共 26 条

[1] The influence of dichromate ions on aluminum dissolution kinetics in artificial crevice electrode cells [J].