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임우조(Uh Joh Lim),윤병두(Byoung Du Yun) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The crevice corrosion of local corrosion occur when the gap exist on metal surface. This crevice corrosion happen to region such as flange of pipe, contact part of casing, under gasket and packing, between valve disk and seat of pump etc. Especially The crevice corrosion of mild steel(SS 400) get serious.<br/> This paper was studied on the crevice corrosion of SS 400 in fluid environment. In 0%, 2%, 3.5%, 5% NaCl solution, the aspect of the crevice corrosion and polarization behavior under the crevice corrosion was investigated. And Weight loss rate of SS 400 with crevice and non-crevice was measured according to the NaCI concentration.<br/> The main results obtained are as follows :<br/> 1) Under crevice corrosion, the corrosion potential become less noble as the concentration of NaCl solution increased.<br/> 2) The current density under open circuit potential was high drained as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, the current density was low drained.<br/> 3) The weight loss rate of SS400 was increased as concentration of NaCl solution increased by 3.5%, but the concentration increased over 3.5%, that of SS400 was decreased.<br/> 4) Effect of oxygen for crevice corrosion in the concentration of 3.5% NaCl solution become sensitive than that of 0% NaCl solution.