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The crevice corrosion behaviour of stainless steel in sodium chloride solution

2011; Elsevier BV; Volume: 53; Issue: 12 Linguagem: Inglês

10.1016/j.corsci.2011.08.012

1879-0496

Qian Hu, Guoan Zhang, Yubin Qiu, Xingpeng Guo,

Welding Techniques and Residual Stresses

The crevice corrosion behaviour of 13Cr stainless steel in NaCl solution was investigated mainly by electrochemical noise measurements, considering the influences of the crevice opening dimension (a) and the area ratio of the electrode outside the crevice to the one inside the crevice (r). Results show that the increase of r value prolongs the incubation period of crevice corrosion, but crevice corrosion develops rapidly once the crevice corrosion occurs. The crevice corrosion develops preferentially at the crevice bottom and then spreads to the whole electrode surface. Proton could reduce on the uncorroded area and hydrogen bubbles form inside the crevice.