Abstract
Anodic polarization behavior of CrMo alloys containing 2–18% Mo is investigated by means of a rotating disk electrode. Auger electron spectroscopy depth profile analysis is employed to study the surface composition as a function of applied potential and charge. Obtained Auger data are interpreted by taking into account the influence of ion sputtering on surface concentration. Results show that addition of Mo to Cr reduces the critical current density for passivation but hardly affects transpassive behavior. The Mo/Cr ratio at the surface strongly depends on applied potential but is little affected by charge.
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