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人工海水中における炭素鋼の腐食挙動に及ぼす$$gamma$$線照射の影響

Effect of $$gamma$$ radiation on the corrosion behavior of cabon steel in synthetic seawater

谷口 直樹 ; 山口 真; 内藤 守正 ; 建石 剛*

Taniguchi, Naoki; Yamaguchi, Makoto; Naito, Morimasa; Tateishi, Tsuyoshi*

高レベル放射性廃棄物処分環境における炭素鋼オーバーパックの腐食に及ぼす放射線の影響を明らかにすることを目的として80$$^{circ}$$Cの人工海水を用いて45Gy/hの$$gamma$$線照射下における浸漬試験,自然電位測定,アノード/カソード分極測定を実施した。人工海水単独系では$$gamma$$線照射による自然電位貴化,腐食量増加,カソード電流の増加が観察されたが、ベントナイト共存下では$$gamma$$線照射による影響はほとんど認められなかった。

In order to clarify the effect of $$gamma$$ radiation on the corrosion of carbon steel overpack in HLW disposal environment, immersion test and electrochemical measurement were carried out using synthetic seawater at 80$$^{circ}$$C under $$gamma$$ radiation of 45 gy/h. In simple seawater case, the corrosion potential became noble, and the amount of corrosion and cathodic current were increased by $$gamma$$ radiation. On the other hand, little effect of $$gamma$$ radiation on the corrosion behavior was observed in the presence of bentonite.

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