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Report No.

The Effect of oxide film on electrochemical corrosion potential of stainless steel in high temperature water

Sato, Tomonori ; Uchida, Shunsuke; Tsukada, Takashi ; Sato, Yoshiyuki*; M$"a$kel$"a$, K.*

${it In-situ}$ measurements of electric resistance and multilateral surface analyses of oxide films on stainless steel specimens exposed to high temperature pure water containing H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ were carried out to evaluate properties of these oxide films and their effects on ECP. During measurement of electric resistance, the potential of the specimens was kept at a natural potential with regard to the reference electrode to avoid change in oxide properties. The results can be summarized as follows. (1) Major parameters of the ${it in-situ}$ electric resistance measurement apparatus could be optimized so as to improve the quality of obtained data. (2) The specific electric resistance of oxide film formed under 100 ppb H$$_{2}$$O$$_{2}$$ exposure at 288 $$^{circ}$$C was about 3 M$$Omega$$cm, 150 times higher than under 200 ppb O$$_{2}$$ exposure. (3) It was confirmed that the effect of potential drop caused by the electric resistance of the oxide film and corrosion current density on ECP was small.



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