Abstract
In the generation and growth process of crevice corrosion, it is considered that pH of the solution inside the crevice decreases because of hydrolysis reaction by metallic ion. In this study, in-situ measurement for surface pH distribution of the stainless steel in crevice corrosion process was carried out by a scanning chemical microscopy (SCHEM) using photo current characteristics of semiconductor.17%Cr-14%Ni-2%Mo austenitic stainless steels were used as test specimens. Test specimens were immersed in artificial seawater with addition of hydrogen peroxide. As a result of the tests, although surface showed uniform pH distribution in early stage, the decrease of pH at one area near the crevice was observed in latter stage. The area extended as the time passed. This area almost agreed with the position at which crevice corrosion occurred. From these results, it was proven that SCHEM was promising to investigate crevice corrosion behavior of the stainless steel. The effect of nitrogen in stainless steel on the crevice corrosion resistance was also investigated.
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