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Anodic behaviour of vanadium in acid solutions

✍ Scribed by S. Hornkjøl; I.M. Hornkjøl

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
428 KB
Volume
36
Category
Article
ISSN
0013-4686

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✦ Synopsis

The anodic behaviour of vanadium in acid solutions was studied in the presence of various anions and cations. Vanadium shows active hehaviour 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&e). 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 logj = 0.5. From this, the anodic transfer coefficient is found to be near 0.3. Passive vanadium is found to follow expectations 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.

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