COOPERATIVE STOCHASTIC-BEHAVIOR IN LOCALIZED CORROSION .2. EXPERIMENTS

Two types of experiments on metastable pitting are carried out in NaCl solutions, one with galvanically coupled Al-2% Cu and the second with 316L stainless steel under potentiostat control. the time dependence of the current is compared to simulated time series developed from the model of Part I of these two papers. The experimental and simulated t ime series are analyzed by several methods in order to extract definin g characteristics, and specifically the degree to which interactions a mong metastable pitting events are present. The similarity between the model and the experiment, particularly of the stainless steel data, i s strong, most important when the intermittent transitions between low and high activity metastable pitting regions are considered. Dependin g on the experimental conditions. large deviations from the Poissonian statistics are observed which agree with the predictions of the model .