Effect of chloride ion on corrosion behavior of SUS316L-grade stainless steel in nitric acid solutions containing seawater components under -ray irradiation

Sano, Yuichi ; Ambai, Hiromu ; Takeuchi, Masayuki ; Iijima, Shizuka; Uchida, Naoki

Concerning the Fukushima Daiichi Nuclear Power Plant accident, we investigated the effect of chloride ion on the corrosion behavior of SUS316L stainless steel, which is a typical material for the equipment used in reprocessing, in HNO $_{3}$ solution containing seawater components, including under the -ray irradiation condition. Electrochemical and immersion tests were carried out using a mixture of HNO $_{3}$ and artificial seawater (ASW). In the HNO $_{3}$ solution containing high amounts of ASW, the cathodic current densities increased and uniform corrosion progressed. This might be caused by strong oxidants, such as Cl $_{2}$ and NOCl, generated in the reaction between HNO $_{3}$ and Cl $^{-}$ ions. The corrosion rate decreased with the immersion time at low concentrations of HNO $_{3}$ , while it increased at high concentrations. Under the -ray irradiation condition, the corrosion rate decreased due to the suppression of the cathodic reactions by the reaction between the above oxidants and HNO $_{2}$ generated by radiolysis.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	493
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Pages	:	p.200 - 206
Publication Year/Month	:	2017/09
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2017.06.017
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Keywords	:	reprocessing; nitric acid; chloride ion; stainless steel; seawater; corrosion; -ray irradiation; Fukushima Daiichi Nuclear Power Station Accident; 福島第一原子力発電所事故
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Registration No. : AA20160411
JAEA Abstracts No. : 46000941
Paper Submission No. : 20509

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