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Report No.

Effects of hydrogen peroxide and oxygen on polarization curves of stainless steel in high temperature pure water

Sato, Tomonori ; Uchida, Shunsuke; Tsukada, Takashi ; Morishima, Yusuke*; Miyazawa, Takahiro*; Sato, Yoshiyuki*

To evaluate ECP response of stainless steel in H$$_{2}$$O$$_{2}$$ condition, the polarization of stainless steel in highly purified water at elevated temperature was measured. In this study a temporary Pt reference electrode, which was fixed at a natural potential vs. the Ag/AgCl reference electrode, was applied for polarization measurements. Stepwise voltage was supplied to a working electrode vs. the temporary reference electrode. As a result, the followings were concluded. (1) It was confirmed that both anodic and cathodic current densities increased as [H$$_{2}$$O$$_{2}$$] increased from 10 ppb to 100 ppb. It might be caused by the contribution of anodic reaction of H$$_{2}$$O$$_{2}$$ as well as cathodic reaction of H$$_{2}$$O$$_{2}$$. (2) Neither anodic nor cathodic polarization curves change as [O$$_{2}$$] increase from 200 ppb to 2400 ppb. It might be caused by the mitigation of iron dissolution and cathodic reaction of O$$_{2}$$ by the formation of protective oxide layer and lower oxide dissolution.



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