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Report No.

Effects of hydrogen peroxide and oxygen on corrosion of stainless steel in high temperature water

Uchida, Shunsuke*; Sato, Tomonori ; Morishima, Yusuke*; Hirose, Tatsuya*; Miyazawa, Takahiro*; Kakinuma, Nagao*; Sato, Yoshiyuki*; Usui, Naoshi*; Wada, Yoichi*

Static and dynamic responses of stainless steel specimens exposed to H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ in high temperature water were evaluated by analyzing ECP and FDCI (frequency dependent complex impedance). The oxide films on the specimens were characterized by multilateral surface analyses, e.g., LRS, SIMS, XPS and direct electric resistance measurement. As a result of evaluation, it was confirmed that (1) corrosive condition of BWR normal water chemistry (NWC) was simulated by 100 ppb H$$_{2}$$O$$_{2}$$ without co-existing O$$_{2}$$, while that of hydrogen water chemistry (HWC) was simulated by 10 ppb H$$_{2}$$O$$_{2}$$, (2) ECP under HWC was as high as that under NWC, while dissolution rate of oxide film under HWC was much lower than that under NWC, (3) combination effects of electric resistance and dissolution rate of oxide caused same level ECP for both NWC and HWC, and (4) distinct weight loss of the specimen exposed to 100 ppb H$$_{2}$$O$$_{2}$$ was observed.



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