魏氏组织对焊接接头缝隙腐蚀的影响
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摘要
利用浸泡试验研究了Q235钢氩弧焊焊接接头在90℃地下水模拟溶液中的缝隙腐蚀行为,通过宏观及微观形貌观察、金相分析、表面轮廓分析和成分分析等方法表征了缝隙腐蚀特征,并借助原位腐蚀试验分析了魏氏组织对缝隙腐蚀行为的影响。结果表明:焊接接头焊缝处存在大量的魏氏组织,缝隙内部的魏氏组织在较高温度下优先发生腐蚀,腐蚀致使缝隙内部焊缝区出现大量坑洞。其原因是:在魏氏组织中,珠光体和先共析铁素体之间的晶界为富碳层,与贫碳的先共析铁素体构成微原电池,导致点蚀在先共析铁素体上形核并发展。
Crevice corrosion behavior of Q235-tungsten inert gas(TIG) welded joint was studied in a simulated groundwater at 90 ℃ through immersion test. The crevice corrosion behaviors were characterized based on macro and micro morphology observation,metallographic examination,surface-profile and component analysis. The effect of the widmanstatten structure on crevice corrosion behavior was analyzed.The results show that the welded joint contains large amount of widmanstatten structure. Crevice corrosion preferentially occurs in the wiamanstatten structure when immersed in the test water at 90 ℃ and some corrosion pits appears in the welded joint location. It is indicated that the grain boundary between pearlite and proeutectoid ferrite is a carbon-rich layer,and proeutectoid ferrite is a carbon-poor area,therefore,a galvanic cell is formed between the grain boundary and the proeutectoid ferrite,which leads to prior nucleation and growth of pitting on the proeutectoid ferrite.
Crevice corrosion behavior of Q235-tungsten inert gas(TIG) welded joint was studied in a simulated groundwater at 90 ℃ through immersion test. The crevice corrosion behaviors were characterized based on macro and micro morphology observation,metallographic examination,surface-profile and component analysis. The effect of the widmanstatten structure on crevice corrosion behavior was analyzed.The results show that the welded joint contains large amount of widmanstatten structure. Crevice corrosion preferentially occurs in the wiamanstatten structure when immersed in the test water at 90 ℃ and some corrosion pits appears in the welded joint location. It is indicated that the grain boundary between pearlite and proeutectoid ferrite is a carbon-rich layer,and proeutectoid ferrite is a carbon-poor area,therefore,a galvanic cell is formed between the grain boundary and the proeutectoid ferrite,which leads to prior nucleation and growth of pitting on the proeutectoid ferrite.
引文
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[2]王驹,徐国庆,郑华铃,等.中国高放废物地质处置研究进展[J].世界核地质科学,2005,22(1):5-16.Wang Ju,Xu Guoqing,Zheng Hualing,et al.Geological disposal of high level radioactive waste in China[J].World Nuclear Geoscience,2005,22(1):5-16.
[3]Baoping Cai,Yonghong Liu,Xiaojie Tian Cai,et al.An experimental study of crevice corrosion behaviour of 316L stainless steel in artificial seawater[J].Corrosion Science,2010,52(10):3235-3242.
[4]Mohammed Ismail Abdulsalam.Behaviour of crevice corrosion in iron[J].Corrosion Science,2005,4 7(6):1336-1351.
[5]Glyn F Kennell,Richard W Evitts.Crevice corrosion cathodic reactions and crevice scaling laws[J].Electrochimica Acta,2009,54(2):4696-4703.
[6]黄本生,朱瑶,樊子萌,等.X80管线钢及其焊缝在高温高压环境下的耐腐蚀性能[J].金属热处理.2017,42(4):127-130.Huang Bensheng,Zhu Yao,Fan Zimeng,et al.Corrosion resistance of X80 pipeline steel and its welded joint under high temperature and high pressure environment[J].Heat Treatment of Metals,2017,42(4):127-130.
[7]雷阿利,郭巧琴,冯拉俊.Q235钢焊缝在亚硫酸铵介质中的耐蚀性研究[J].电化学,2006,12(2):195-198.Lei Ali,Guo Qiaoqin,Feng Lajun.Corrosion behavior of the welding seam of the Q235 steel jointed by J420 electrode in ammonium sulfite solution[J].Electrochemistry,2006,12(2):195-198.
[8]孙齐磊,曹备,吴荫顺.Q235管线钢焊接接头微区电化学行为[J].北京科技大学学报,2009,31(1):41-47.Sun Qilei,Cao Bei,Wu Yinshun.Electrochemical behavior of various micro2areas on the welded joint of Q235 steel[J].Journal of University of Science and Technology Beijing,2009,31(1):41-47.
[9]喻巧红,刘超,庞晓露,等.Q235焊接接头的缝隙腐蚀行为[J].金属学报,2014,50(11):1319-1326.Yu Qiaohong,Liu Chao,Pang Xiaolu,et al.Crevice corrosion behaviors of Q235 weld joint[J].Acta Metallurgica Science,2014,50(11):1319-1326.
[10]Laycock N J,Stewart J,Newman R C.The initation of crevice corrosion in stainless steels[J].Corrosion Science,1997,39(10):1791-1809.
[11]黄安国,王永生,李志远,等.针状铁素体焊缝金属腐蚀行为的研究[J].材料保护,2004,37(03):6-9.Huang Anguo,Wang Yongsheng,Li Zhiyuan,et al.Corrosion behaviors of welded joint with acicular ferrite[J].Journal of Materials Protection,2004,37(03):6-9.
[12]郭潮海.33 mm X80M钢母材及环焊接头的微观组织和析出物分析[J].金属热处理,2017,42(4):154-158.Guo Chaohai.Analysis of microstructure and precipitation of base metal and girth weld joint of 33 mm X80M steel[J].Heat Treatment of Metals,2017,42(4):154-158.
[13]李亮,蔺卫平,梁明华,等.X90钢直缝埋弧焊管焊接接头的组织和性能[J].金属热处理,2015,40(2):56-60.Li Liang,Lin Weiping,Liang Minghua,et al.Microstructure and mechanical properties of X90 steel weld joint of longitudinal submerged arc welded pipe[J].Heat Treatment of Metals,2015,40(2):56-60.
[14]苏景新,刘波,郭英.Q235钢在模拟海水溶液中的缝隙腐蚀行为[J].材料保护,2017,50(2):33-37.Su Jingxin,Liu Bo,Guo Ying.Crevice corrosion behaviors of Q235mild steel in simulated seawater[J].Materials Protection,2017,50(2):33-37.