Abstract
A parameter which represents the spectrum slope of noise current fluctuation describes the occurrence of pitting corrosion. The method is applied to analyses of anodic current fluctuation on pure iron and stainless steel electrodes using a low noise potentiostat. The parameter was obtained using the maximum entropy method (MEM). At a stable state, the slope number n is zero, which means white noise, but the n value decreases and stays around −0.5 during the induction period and then steeply decreases below −1 before pit generation. The method was difficult to apply to stainless steel because of the very low current.
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