The effects of alternating voltage (av) modulated passivation on the properties of the passive film formed on 18Cr–9Ni–1Ti stainless steel in sulphuric acid have been investigated by ellipsometry, the potential step technique, Auger surface analysis, and potentiostatic cathodic reduction. It has been found that av modulated passivation can increase the passive film thickness and alters its cathodic reduction behaviour; the chemical dissolution characteristics are also affected. An increase in the breakdown potential of the film is achieved with some amplitudes of av modulation.
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