SEM morphologies of crevices formed on the specimens during the CCT thermammetry test at 750 mV/SCE in 1 mol/L NaCl solution: (a) crevice formed on UNS S32101, (b) crevice formed on UNS S31803, (c)crevice formed on UNS S32750 and (d) pits formed on UNS S31803 when the test halted at 3 µA/cm2.