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.

Language	:	English
Journal	:	Proceedings of International Conference on Water Chemistry of Nuclear Reactor Systems 2006 (CD-ROM)
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Number	:
Pages	:	6 Pages
Publication Year/Month	:	2006/10
Meeting title	:	International Conference on Water Chemistry of Nuclear Reactor Systems 2006
Held date	:	2006/10
Location (city)	:	Jeju
Location (country)	:	Korea
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Keywords	:	no keyword
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Registration No. : BB20061929
JAEA Abstracts No. :
Paper Submission No. : 10905

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