核岛容器地脚螺栓的失效分析
Failure Analysis of Anchor Bolt of Container in Nuclear Island
摘 要
国内某核电站在进行某核岛容器的地脚螺栓复核螺栓力矩时, 一颗螺栓发生了断裂。采用宏观形貌、化学成分、金相、物相、扫描电镜观察和电化学性能测试等手段对地脚螺栓断裂的原因进行了分析。结果表明, 容器罐体酸洗钝化时, 酸洗液渗入地脚螺栓孔中, 地脚螺栓因缝隙腐蚀和电偶腐蚀逐渐变细, 最终在扭矩校核时发生断裂失效。同时, 本文提出了防止该类地脚螺栓在其使用过程中发生类似事件的建议。
酸洗液
缝隙腐蚀
电偶腐蚀
anchor bolt
acid-washing solution
crevice corrosion
galvanic corrosion
Abstract
During checking the anchor bolt torque of the container in nuclear island of a nuclear power plant, a bolt had broken. The visual examination, chemical analysis, metallography, phase analysis, SEM and electrochemical tests were performed and analyzed, The results showed that acid-washing solution seeped into the anchor hole during the container tank pickling and passivating. The bolt was tapered off to some extent due to crevice corrosion and galvanic corrosion and ruptured ultimately during the torque check. Several measures for the corrosion control were proposed.
中图分类号 TG174
所属栏目 失效分析
基金项目 大型先进压水堆核电站重大专项(2011ZX06004-009-0902)
收稿日期 2011/11/17
修改稿日期
网络出版日期
作者单位点击查看
备注方可伟, 工程师, 硕士,
引用该论文: FANG Ke-wei,BAI Rong-guo,LIU Xiao-jun,LI Yan,FEI Ke-xun. Failure Analysis of Anchor Bolt of Container in Nuclear Island[J]. Corrosion & Protection, 2012, 33(12): 1123
被引情况:
【1】史克勇,陈如江,张曼杰,赵大伟,金曦,马晓勇, "油田用插拔式挂片支架的腐蚀原因",腐蚀与防护 34, 367-370(2013)
【2】马晓勇,杨明,龙云,赵大伟,陈超,杨皓洁, "海上平台栈桥输油管线腐蚀失效原因",腐蚀与防护 36, 230-233(2015)
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参考文献
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【4】Stern M, Geary A L. Electrochemical polarization I.A theoretical analysis of the shape of polarization curves[J]. Electrochem Soc, 1957, 104(1):56-63.
【5】Eligehausen Rolf, Bouska Petr, Cervenka Vladimir, et al. Size effect of the concrete cone failure load of anchor bolts[C]//Fracture mechanics of concrete structures, London, 1992:517-525.
【6】王光雍著. 自然环境的腐蚀与防护·大气海水·土壤[M]. 北京:化学工业出版社, 1997:7-9.
【7】Winston Revie R. Uhlig′s corrosion handbook[M]. 杨武等译.北京:化学工业出版社, 2005:101-102.
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