Abstract
The fluctuations of potential and current of A516 carbon steel were monitored in chloride solution. Different noise patterns were observed during the incubation and initiation periods of pitting. During the incubation of pits, the fluctuations of potential were in phase with the current fluctuations, indicating that the faradaic current plays a major role in pit incubation. The initiation of pitting was characterized by sharp fluctuations of potential and current. The slower recovery of potential always exceeded the time for the recovery of the current. This was attributed to the slow discharging of the capacitance on the electrode surface. The capacitance plays a major role on potential fluctuations generated during pitting of carbon steel.
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