Fusion engineering and design vol:24 issue:3 pages:299-307
In the present work, the effects of dissolved oxygen and hydrogen peroxide on corrosion potential have been studied on type 316L stainless steel in a hot lithium hydroxide solution. The results indicate that the corrosion potential will remain at around - 850 mV vs SCE if the dissolved oxygen in the solution is controlled at a level of less than 10 ppb. However, 316L stainless steel will become completely passivated when about 650 ppb of oxygen exists in the solution. As a result, the corrosion potential of 316L steel will rise to around - 400 mV vs SCE, and eventually, with longer immersion times, to even higher values, e.g. - 300 mV vs SCE. However, the presence of less than 500 ppb H2O2 has no significant effect on the corrosion potential. A potential jump (from - 850 to - 500 mV vs SCE) is observed only when a large amount of H2O2, for instance 1 ppm, is present in the solution. Related to radiolysis of water and with potential-dependent stress corrosion cracking, the effects of dissolved oxygen and hydrogen peroxide on the corrosion potential of 316L stainless steel in the hot lithium hydroxide solution have been discussed.