The effects of electrolyte composition and oxide film age on the crevice corrosion properties of alloys 625 and 22 were studied at temperatures ranging from 60 to 95oC in concentrated chloride electrolytes. Critical potentials were determined using conventional current density thresholds and comparisons were made between alloys 625 and 22 on the basis of these critical potentials. Air aged alloy 22 specimens exhibited the highest resistance to crevice corrosion at 95°C in terms of critical crevice potentials, while freshly polished alloy 22 exhibited the lowest resistance. Studies over the entire temperature range showed that air aged alloy 22 is more resistant to crevice corrosion than air aged alloy 625 as evidenced by higher critical crevice potentials. As the temperature was lowered from 95 to 80°C, critical crevice potentials for alloy 22 either approached or exceeded experimentally determined Cr (Mo, Ni) transpassive potentials. Key Words: alloy 625, alloy 22, nuclear waste containment, crevice corrosion, chloride, critical crevice potential,
repassivation potential, cyclic potentiodynamic polarization