Mott-Schottky plots and photoelectrochemical measurement were carried out on film formed on stainless steel by alternating voltage (av) and direct current (dc) passivation in a Na2SO4 solution. The frequency dispersion of passive film was investigated. Flat band potential and donor densities were determined from Mott-Schottky plots. The results showed that the av passive film behaved like a semiconductor, and the difference in semiconducting properties between av and dc passive film was discussed.
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