Measurements of the rate of crack growth in alloy 600 (UNS N06600) in high-temperature lithiated hydrogenated water were performed at various potentials and pH levels. The mode of cracking was found to be dependent on temperature and pH of the solution. The lowest crack growth rate occurred from pH 6 to 7. Intergranular and transgranular corrosion was observed at 350°C and 250°C, respectively. Cracks were formed at the corrosion potential and at potentials in the active and transpassive regions, but cracks were not formed in the passive potential region. Alloy 600 corrosion in hydrogenated water in a capsule test (simulating corrosion in a crevice) occurred with solution alkalization.
Keywords:
alkalinity,
alloy 600,
cracking,
intergranular corrosion,
pH,
potential,
temperature,
transgranular corrosion
NACE International
1994
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