Alloy 22 specimens were tested in high temperature (100 to 160oC), high concentration chloride
and nitrate environments. Results of this study indicate that increasing nitrate to chloride ratio to 0.5 in
these electrolytes increases resistance to localized breakdown and enhances repassivation. In these
extreme environments, localized corrosion occurred by pitting even though specimens were tested using
artificial crevice formers. Open circuit (Ecorr), breakdown and repassivation potentials all increase, and
pitting morphology changes as nitrate to chloride ratio increases from 0.05 and 0.15 to 0.5. Results also
indicate that increasing the temperature from 100 to 160oC increases Ecorr values, while breakdown
potentials and repassivation potentials peak at 130oC for the 0.5 nitrate to chloride ratio electrolytes.