Abstract
Gamma-irradiation significantly increases the corrosion potential on pure Co and the cobalt alloy, Stellite-6. To understand the radiation-induced corrosion of these materials, electrochemical studies of film formation and conversion on these metals were performed as a function of potential under both potentiodynamic and potentiostatic conditions. The oxidized surfaces were characterized by electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. Four characteristic potential regions are identified for anodic oxidation. Comparison of the behavior of pure cobalt and a cobalt alloy provides an insight into the role of an initial air-formed chromium oxide layer on the oxidation of Stellite-6 under different corrosion conditions.
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