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オーバーパック溶接部の耐食性評価に関する研究,2(共同研究)

Study on the corrosion assessment of overpack welds, 2 (Joint research)

三井 裕之*; 谷口 直樹 ; 大槻 彰良*; 川上 進; 朝野 英一*; 油井 三和

Mitsui, Hiroyuki*; Taniguchi, Naoki; Otsuki, Akiyoshi*; Kawakami, Susumu; Asano, Hidekazu*; Yui, Mikazu

炭素鋼オーバーパック溶接部の長期健全性評価に資するため、溶接部において想定される腐食現象を想定して腐食試験計画を策定した。また、この計画に基づいて腐食試験を開始し、炭素鋼溶接部の電気化学特性について母材との比較を行った。EBW溶接材,TIG溶接材について、母材部,熱影響部及び溶接金属部のアノード分極曲線の測定を炭酸塩(0.1M及び0.01M CO$$_{3}$$)溶液中で行ったところ、以下の結果を得た。EBW材については、母材,熱影響部及び溶接金属で金属組織が異なるが、アノード分極曲線に顕著な違いは現れなかった。TIG材については、溶接金属の電流値が全般的に高くなった。0.01M CO$$_{3}$$-pH10の溶液中では、急激な電流値の立ち上がりを伴う、局部腐食的な変化も認められた。

The corrosion experiments for welded carbon steel were planed to contribute to an assessment of long-term integrity of carbon steel overpack welds considering corrosion damage specific to overpack welds. Based on this plan, electrochemical tests for welded carbon steel using the samples welded by EBW and TIG were carried out, and the corrosion behavior of welded zone was compared with that of base metal. The results of anodic polarization tests in 0.01M and 0.1M carbonate aqueous solutions for base metal, heat affected zone and welded metal indicated that; -As for EBW, the anodic polarization curves were not affected by welding although the metallurgical structures vary with base metal, heat affected zone and welded metal. -As for TIG, the current density of welded metal was larger than that of base metal and of heat affected zone, and local dissolution with immediate increase in current density was observed in 0.01M-pH10 carbonate aqueous solution.

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