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

沸騰硝酸中におけるステンレス鋼の腐食速度に及ぼす添加カチオンの再酸化速度の影響

山本 正弘; 加藤 千明; 本岡 隆文; 入澤 恵理子 ; 伴 康俊 ; 上野 文義

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

核燃料再処理施設容器に用いられるステンレス鋼は、沸騰硝酸中で含有する陽イオンの影響で粒界腐食を起こす。陽イオンは、ステンレス鋼表面で還元されることにより腐食を加速するが、その後のバルク溶液中で酸化され、さらに腐食を加速する。その際の酸化反応速度を測定した結果、Npイオンは、還元反応速度も大きくかつ再酸化速度も大きいため、微量に含有されるだけで激しい腐食を超すことを明らかにした。

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.

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