4.7 Article

Comparative study of film formation on high-purity Co and Stellite-6: Probing the roles of a chromium oxide layer and gamma-radiation

Journal

CORROSION SCIENCE
Volume 63, Issue -, Pages 40-50

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.05.007

Keywords

Alloy; Cobalt; Polarization; EIS; XPS; Anodic films

Funding

  1. Natural Science and Engineering Council of Canada (NSERC)
  2. Atomic Energy of Canada Limited (AECL) Industrial Research Chair Agreement
  3. Canada Foundation for Innovation

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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. (c) 2012 Elsevier Ltd. All rights reserved.

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