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The purpose of this study is to investigate the effect of amount of adhered chloride and applied stress on crevice corrosion cracking of high strength type304 stainless steel. The cold worked type304 stainless steel pipe with shot peening were applied for this study. A crevice was created between the outside of the pipe and an Oring. A press fitting part was inserted inside the pipe to apply a tensile stress to outer surface of the pipe. Specimens were provided in a wet/dry cyclic corrosion test after one spray of artificial seawater. The crack generation time decreased as amount of adhered chloride increased. It was found that negative correlation between the crack generation time and the logarithm of the chloride amount. This result seemed to be related to the fact that the pit growth rate was proportional to the logarithm of the chloride amount. This respect was verified by cyclic corrosion test and electrochemical measurements such as ER, CREV. The effect of applied stress was evaluated by changing the size of press fitting part inserted in the pipe. The crack generation time decreased as the applied stress increased.

Effect of Amount of Adhered Chloride and Applied Stress on Crevice Corrosion Cracking of Cold Worked Type 304 Stainless Steel