In-situ observation for the reaction of hydrogen peroxide in high temperature water utilizing electrochemical impedance spectroscopy

Sato, Tomonori ; Kato, Chiaki ; Yamamoto, Masahiro ; Nakano, Junichi; Tsukada, Takashi

Direct observation of the reaction of H $_{2}$ O $_{2}$ at the surface of stainless steel was performed by electrochemical impedance spectroscopy (EIS) in high-purity water at 288 $^{circ}$ C. From this, the corrosive conditions and behavior of stainless steel in high temperature and high-purity water containing H $_{2}$ O $_{2}$ were determined. The results obtained could be summarized as follows: (1) The EIS data were directly measured in high-temperature water without electrolyte injection. (2) The conductivity of the high-temperature water at 288 $^{circ}$ C, calculated by Rsol, was 8.3 10 $^{-6}$ S/cm. (3) Rp was 9.0 103 ohm cm $^{2}$ for 100 ppb of injected H $_{2}$ O $_{2}$ , and the estimated corrosion rate was about 30 um/year. (4) The reciprocal of the polarization resistance had a linear relationship with the H $_{2}$ O $_{2}$ concentration, indicating that the corrosion current is determined by the cathodic reaction of H $_{2}$ O $_{2}$ . (5) The estimated DH $_{2}$ O $_{2}$ was 1.5 10 $^{-4}$ cm $^{2}$ /s.

Language	:	English
Journal	:	ECS Transactions
Volume	:	41
Number	:	25
Pages	:	p.217 - 226
Publication Year/Month	:	2012/05
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Paper URL	:	https://doi.org/10.1149/1.3697591
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	hydrogen peroxide; high temperature pure water; electrochemical impedance
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Cooperating Institute	:	原子力安全・保安院

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Registration No. : AA20140613
JAEA Abstracts No. :
Paper Submission No. : 30619

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