Abstract
The electrochemical behavior and passive film properties of Co-Cr-Mo ultrahigh-strength stainless steel in neutral and acidic chloride solution were evaluated by potentiodynamic polarization curves, electrochemical impedance spectroscopy and x-ray photoelectron spectroscopy. The results indicate that the steel exhibited good passivation behavior in neutral NaCl solution. Both the film formation potential and the applied potential time showed great effects on the open-circuit potential value and stability of the passive film. Furthermore, the oxides and hydroxides of Fe, Co, Mo and Cr were the primary components of the passive film, and the composition of the passive film was changed with a change of pH environment.
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