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Comparison of the effects of hydrogen peroxide and oxygen on oxide films on stainless steel and corrosion behaviors in high temperature water

Uchida, Shunsuke; Sato, Tomonori ; Tsukada, Takashi ; Sato, Yoshiyuki*; Wada, Yoichi*

${it In-situ}$ measurements of corrosion behaviors of stainless steel specimens exposed to H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ in high temperature water have been carried out. Oxide films on the specimens have been also examined with multilateral surface analyses. The major differences between environments containing O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ are summarized as follows. (1) The oxide films formed under H$$_{2}$$O$$_{2}$$ environment consists mainly of hematite with high electric resistance, while that under O$$_{2}$$ environment consists of magnetite. (2) Differences in ECP of stainless steel exposed to H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ are caused by differences in chemical form of oxide and oxidation of H$$_{2}$$O$$_{2}$$ at the surface. (3) H$$_{2}$$O$$_{2}$$ caused higher ECP and lower corrosion current density than O$$_{2}$$ with the same oxidant concentrations, resulting from the effects of the thin oxide films with high electric resistance. (4) Lower corrosion current density results in lower IGSCC crack growth rate.

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