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Long term integrity of overpack closure weld for HLW geological disposal, 2; Corrosion properties under anaerobic conditions

HLW地層処分におけるオーバーパック溶接部の長期健全性,2; 還元条件下における腐食特性

小林 正人*; 横山 裕*; 高橋 里栄子*; 朝野 英一*; 谷口 直樹; 内藤 守正

Kobayashi, Masato*; Yokoyama, Yutaka*; Takahashi, Rieko*; Asano, Hidekazu*; Taniguchi, Naoki; Naito, Morimasa

炭素鋼オーバーパックの長期健全性を予測するため、還元条件下での炭素鋼溶接部の腐食挙動が調べられた。本研究で用いた試験片は3つの溶接方法(GTAW, GMAW, EBW)から作成された。各試験片には全面腐食が観察され、溶接部における腐食速度は母材と同等かそれ以下となった。浸漬期間中に吸収された水素量は3年間で2.48$$times$$10$$^{-5}$$ mol kg[Fe]$$^{-1}$$(0.05ppm)以下であり、水素脆化の影響がほとんどない値となった。水素脆化感受性は母材で最も大きく、溶接による悪影響はほとんどないことが示された。溶接された炭素鋼オーバーパックは還元条件下で期待される寿命期間中耐食性を有すると考えられる。

The corrosion behaviour of a carbon steel weld joint under anaerobic conditions was investigated to estimate the long-term integrity of the carbon steel overpack. The weld specimens in this study were produced using three welding methods: GTAW, GMAW and EBW. General corrosion was observed for each immersion specimen and the weld joint corrosion rate was the same as or less than that of the base metal. The hydrogen concentration absorbed during immersion testing was less than 2.48$$times$$10$$^{-5}$$ mol kg[Fe]$$^{-1}$$(0.05 ppm) after three years, a value regarded as having little influence on hydrogen embrittlement. The susceptibility to hydrogen embrittlement was highest in the base metal, suggesting that there was little adverse effect on the weld joint from welding. The welded carbon steel overpack is assumed to maintain its resistance to corrosion as a disposal container for the expected lifetime under anaerobic underground conditions.

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パーセンタイル:75.13

分野:Materials Science, Multidisciplinary

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