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新型被覆管材料12%Cr, 6%Al酸化物分散強化鋼の腐食挙動に及ぼす硝酸濃度の影響

Effect of nitric acid concentration on corrosion behavior of 12%Cr, 6%Al oxide dispersion-strengthened steel which is a new cladding material

安倍 弘 ; 高畠 容子  ; 佐野 雄一  ; 竹内 正行 ; 小泉 健治 ; 山下 真一郎   ; 坂本 寛*

Ambai, Hiromu; Takahatake, Yoko; Sano, Yuichi; Takeuchi, Masayuki; Koizumi, Kenji; Yamashita, Shinichiro; Sakamoto, Kan*

新型被覆管として開発されている12%Cr, 6%Al酸化物分散強化鋼に関し、核燃料再処理工程での研究の一環として硝酸濃度が腐食挙動に与える影響を評価した。沸騰硝酸中において硝酸濃度の増加に伴い腐食は加速したが、いずれの条件においても耐食性が良好であり活性腐食は発生しなかった。Alについては、Crと共に耐食性に寄与していると予想される。硝酸濃度の増加に伴う腐食の加速は主に不働態保持電流の増大が原因と考えられる。

As part of a study of nuclear fuel reprocessing process, the effect of nitric acid concentration on the corrosion behavior of 12%Cr, 6%Al oxide dispersion-strengthened steel which is developed as a new cladding material was evaluated. The corrosion rate was increased with increasing nitric acid concentration at boiling point. But this material had a good corrosion resistance and active corrosion didn't occur. The corrosion resistance can be attributed to Al as well as Cr. The acceleration of the corrosion rate with increasing nitric acid concentration was caused by the increase of the passive current density.

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