Abstract
The mechanism of passivity breakdown within crevices was investigated for aluminum in and for iron in dilute mixtures of , , and . ThepH, electrode potential, and current distribution were monitored continuously in segmented crevices which simulated realistic corrosion conditions. Variation in the crevice geometry was found to have a significant effect on the current distribution behavior during initiation of crevice corrosion. Breakdown of passivity on aluminum typically took place within a matter of hours and was accompanied by hydrogen bubble evolution within the crevice at a pH near 4.1. The behavior for iron was qualitatively different than that for aluminum, indicating that the mechanism of passivity breakdown is different for the two metals.
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