Abstract
A mathematical model to calculate the solution chemistry inside a corroding crevice was developed based on mass transfer. Distributions of concentrations of ions, pH and electrode potential were obtained for Type 304 and 316 stainless steels in 3% NaCl solution at 80{degree sign}C. The highest pH values at corroding areas did not depend on electrode potential, and were equal to the depassivation pH, pHd. On the other hand, the lowest pH values, pHmin, increased with decreasing electrode potential, and were equal to pHd at the repassivation potential, ER. So, it was confirmed that ER is the critical potential for crevice corrosion, because below this potential, pH values inside crevices are higher than pHd and crevice corrosion cannot continue to progress.
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