A Statistical Analysis of the Fluctuations of the Passive Current

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Abstract
From recordings of fluctuations in the passive current of Fe‐Cr alloys in chloride‐containing solutions, the statistical properties of sequences of intervals between current spikes and sequences of decay constants for the spikes were obtained. The interevent time sequences were examined for independence and stationarity, and decay constant sequences for time trends. The results show that the interevent times cannot be modeled by renewal processes or homogeneous Markov chains, but more complicated stochastic models have to be employed. The decay constants of the current transients show considerable spread and no significant trends in time, with the possible exception of cases in which the experiments terminated in an active pit, where the repassivation rate seems to become progressively slower.

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