Effect of re-oxidation rate of additive cation on corrosion rate of stainless steel in boiling nitric acid solution

Yamamoto, Masahiro ; Kato, Chiaki ; Motooka, Takafumi; Irisawa, Eriko ; Ban, Yasutoshi ; Ueno, Fumiyoshi

Stainless steels used in nuclear fuel reprocessing plant occur intergranular corrosion by boiling nitric acid solution containing some cations. Reduction reaction of these cations accelerates corrosion rate of stainless steel, and then, they are re-oxidized to initial state in bulk nitric acid solution. These re-oxidized cations repeatedly concern corrosion reaction of stainless steel. The re-oxidation rates of typical cations were analyzed in the present work. As the result, Np ion accelerates corrosion of stainless steel in a little amount because it has both large reduction reaction rate and re-oxidation rate.

Language	:	English
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Meeting title	:	Pacific Rim Meeting on Electrochemical and Solid-State Science (PRiME 2016)
Held date	:	2016/10
Location (city)	:	Honolulu
Location (country)	:	U.S.A.
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Keywords	:	再処理施設; 腐食; 酸化速度; 硝酸溶液
Research Facility	:	BECKY(バックエンド研究施設)
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Registration No. : BB20161093
JAEA Abstracts No. :
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