| Q125级套管钢高频电阻焊接头耐CO2/H2S腐蚀行为 |
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| 引用本文： | 武会宾,刘立甫,王立东,唐荻.Q125级套管钢高频电阻焊接头耐CO2/H2S腐蚀行为[J].焊接学报,2013(10):17-21. |
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| 作者姓名： | 武会宾 刘立甫 王立东 唐荻 |
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| 作者单位： | 北京科技大学高效轧制国家工程研究中心, 北京 100083,北京科技大学高效轧制国家工程研究中心, 北京 100083,中航工业集团北京航空制造工程研究所, 北京 100024,北京科技大学高效轧制国家工程研究中心, 北京 100083 |
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| 基金项目： | 国家科技重大专项项目(2011ZX05016-004) |
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| 摘 要： | 采用SEM,EBSD和电化学等手段研究了Q125级石油套管钢高频电阻焊接头的耐CO2/H2S腐蚀行为.结果表明,Q125级套管钢高频电阻焊接头处母材的耐腐蚀性能最好,热影响区次之,而焊缝的耐腐蚀性能最差,导致高频电阻焊接头在CO2/H2S腐蚀环境中产生了沟槽腐蚀.试验钢焊缝处的大角晶界比例高于母材和热影响区,从而使焊缝区反应速度常数高于母材和热影响区,这是焊缝区腐蚀速率最高的一个重要原因.通过电化学分析表明,焊缝处的电极反应的极化阻力最小,腐蚀反应易于发生;而母材的电极反应的极化电阻最大,腐蚀反应不易进行,这与腐蚀试验所得结果及极化曲线分析结果一致.
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| 关 键 词： | 焊接接头 沟槽腐蚀 CO2/H2S腐蚀 大角晶界 |
| 收稿时间： | 2012/7/20 0:00:00 |
Corrosion behavior of high frequency resistance welding joint of Q125 grade tube steel under CO2/H2S environment |
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| WU Huibin,LIU Lifu,WANG Lidong and TANG Di.Corrosion behavior of high frequency resistance welding joint of Q125 grade tube steel under CO2/H2S environment[J].Transactions of The China Welding Institution,2013(10):17-21. |
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| Authors: | WU Huibin LIU Lifu WANG Lidong and TANG Di |
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| Affiliation: | National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing 100083, China,National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing 100083, China,AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China and National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The corrosion behavior of high frequency resistance welding (ERW) joint of Q125 grade tube steel was studied by SEM,EBSD and electrochemical measurement under CO2/ H2S environment. The results showed that the corrosion prosperty of joint was worse than that of the base metal and heat affected zone,thus the grooving corrosion occurred in the ERW welding joint under CO2/H2S environment. The proportion of large-angle grain boundary in welding zone was more than that of base metal and heat affected zone,which played an important role in the highest corrosion rate of welding zone. Electrochemical analysis results demonstrated that welding zone was easy to corrode because of its smallest polarization resistance in electrode reaction, while the polarization resistance of base metal was the biggest. All of these were consistent with the result of corrosion test and analysis of polarization curve. |
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| Keywords: | welding joint grooving corrosion CO2 /H2S corrosion large-angle grain boundary |
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