Photocurrent transients on stainless steel in the passive and transpassive regions in 0.5M H2SO4 were obtained using weak signal detecting technique. In passive region, the photoresponse an stainless steel exhibits n-type semiconductor characteristics. While changing from the passive to transpassive region, a n-p type transformation happens. This phenomenon is possibly caused by the change of the composition of passive film of stainless steel.
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