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*

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.

Language	:	English
Journal	:	Proceedings of 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems (CD-ROM)
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Number	:
Pages	:	15 Pages
Publication Year/Month	:	2007/08
Meeting title	:	13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems
Held date	:	2007/08
Location (city)	:	Whistler
Location (country)	:	Canada
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Keywords	:	no keyword
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Registration No. : BB20072034
JAEA Abstracts No. :
Paper Submission No. : 7277

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