| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 793679 | Journal of Materials Processing Technology | 2008 | 8 Pages |
Abstract
Cobalt corrodes in dilute HNO3 solutions according to an autocatalytic mechanism involving the formation of HNO2. The rate of metal dissolution increases with the acid concentration. Passivation of cobalt starts to take place in concentrated HNO3 solutions due to the formation of a passive oxide film on the metal surface. Addition of inorganic anions, in either neutral or acidic forms, affects the rate of cobalt dissolution and supports the proposed autocatalytic mechanism.
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Authors
S.M. Abd El Haleem, E.E. Abd El Aal,