Abstract
In connection with crevice corrosion of stainless steel in high temperature water, Type 304 stainless steel was anodically electrolyzed in solution at temperatures up to 250°C with determination of compositional changes of the anolyte. Components of the steel dissolved as Fe2+, Cr3+, and Ni2+ and lowered the pH of the anolyte by hydrolysis of the dissolved ions. pH measured at room temperature decreased with increasing amounts of charge. During electrolysis at temperatures above 150°C, lower pH values and much more precipitates were obtained, and at 200° and 250°C hard films, which were mainly composed of and scarcely dissolved in hot , were formed on the specimens. In the electrolysis at 250°C, lower pH values were obtained in concentrated Cl− solutions. These pH changes of the anolyte were well described with the experimental results of hydrolysis of Cr3+ solutions. At 200° and 250°C, local corrosion of the steel in the anolyte occurred.
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