A Compositional Analysis of the Solution within the Crevice on the Stainless Steels

Abstract

A compositional analysis of the solution within the crevice during the nucleation and growth of crevice corrosion in the chloride environments on the stainless steels was pertormed on the electrochemical simulation.
The experimental results are following:
(1) Charge passed during electrolysis was in the linear relationship with the concentration of metallic ions in the crevice. No selective dissolution for the alloying elements was observed during electrolysis.
(2) Chloride ion concentration in the crevice solution has a linear relationship with the metallic ion concentration dissolved into the crevice. Ratio of chloride ion concentration to metallic ion concentration depends on the chloride ion concentration in the environment out of the crevice.
(3) pH of the crevice solution was dependent on the ratio of chloride ion concentration to metallic ion concentration of the crevice solution and charge passed into the crevice during electrolysis.