Abstract
The chemical composition of the solution inside localized corrosion sites has a controlling influence on the initiation and progression of the attack. While the generally accepted model for crevice corrosion initiation of stainless steel predicts changes in the chemistry of the crevice solution, experimental measurements of such solutions have been generally limited to propagating crevices. The present work uses ion chromatography to speciate ionically and analyse quantitatively the crevice solutions removed from Type 304 stainless steel crevices at three different stages in the corrosion process: early in the incubation period, late in the incubation period, and during the propagation stage. Transition metals, chloride ion and sulfur species are detected. Based upon experimentally determined crevice volumes, the concentration of each species is estimated. For propagating crevices, these estimated concentrations agree well with previous measurements. For crevice solutions removed during the incubation period, the metal ion concentration corresponds to values well above the depassivation pH for Type 304 stainless steel. In addition, sulfite is the only sulfur species found during the incubation period.
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