ANODIC BEHAVIOR OF VANADIUM IN ACID-SOLUTIONS

被引：17

作者：

HORNKJOL, S

HORNKJOL, IM

机构：

[1] Department of Chemistry, University of Oslo, N-0315 Oslo 3, P.O. Box 1033, Blindern

来源：

ELECTROCHIMICA ACTA | 1991年 / 36卷 / 3-4期

关键词：

D O I：

10.1016/0013-4686(91)85143-U

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The anodic behaviour of vanadium in acid solutions was studied in the presence of various anions and cations. Vanadium shows active behaviour in all the solutions tested, except for some barium containing ones at pH > 4, in which the metal is passivated at potentials positive to 0.09 V(sce). It is found that active vanadium goes into solution through a monovalent intermediate, and it is assumed that the kink density (s) depends on the anodic current density (j) by d log s/d log j = 0.5. From this, the anodic transfer coefficient is found to be near 0.3. Passive vanadium is found to follow expectation from other passive metals, but it has a very high passive current and an extraordinarily large anodization ratio. Both chemical analysis and XPS-analysis show that the passive film contains barium ions and presumably pentavalent vanadium.

引用

页码：577 / 580

页数：4

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