Abstract
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 of 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 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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