SCC susceptibility of carbon steel in simulated anaerobic alkaline ground-water environments

Shimizu, Kosuke*; Inoue, Hiroyuki*; Taniguchi, Naoki ; Sakamaki, Keiko ; Tachikawa, Hirokazu*

The effect of solution pH to the SCC susceptibility of carbon-steel (CS) in an anaerobic ground water must be investigated to guarantees the soundness of the CS HLW overpack for ultra-long term. For the present study, the SCC susceptibility of CS at and near the reversible hydrogen evolution potentials at each solution pH was evaluated by the slow strain rate test (SSRT); as for the test solution, NaHCO/NaCO solutions whose pH were adjusted 8 to 13 and purged with Ar gas were used. The SCC susceptibility became minimum at pH near 9 and 13 as well as reached maximum at pH near 11.