Abstract
Critical potentials for initiation and propagation of stress corrosion cracking, SCC, were investigated with creviced round bar specimens in various concentrations of NaCl solutions at 80åC. After critical potentials for crevice corrosion, ER,CREV, were measured, two types of SCC tests - that is SCC test without pretreatment, Test-1, and with pretreatment, Test-2 - were performed. It was confirmed that ER,CREV is the critical potential for initiation of both crevice corrosion and SCC. After SCC initiation condition was determined, stepwise polarization measurement with stress was performed to determine the repassivation potential for the crack propagation, ER,CRACK. The ER,CRACK values were lower than ER,CREV and they became lower with increasing test duration, and reached to the specific value. It indicates that the stress corrosion crack works as severer crevice.
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