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XU Lianyong1,2, KANG Zhaoyang1,2, LU Yongxin1,2, HAN Yongdian1,2. Analysis of corrosion behavior of carbon steel weld joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 97-101. DOI: 10.12073/j.hjxb.2018390022
Citation: XU Lianyong1,2, KANG Zhaoyang1,2, LU Yongxin1,2, HAN Yongdian1,2. Analysis of corrosion behavior of carbon steel weld joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 97-101. DOI: 10.12073/j.hjxb.2018390022

Analysis of corrosion behavior of carbon steel weld joint

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  • Received Date: June 21, 2016
  • The corrosion behavior of weld joint various regions with two kinds of heat input welding joint was studied by observing the welding joint microstructure and measuring the open circuit potential, polarization curves and galvanic corrosion current. Results show that the corrosion resistance in each region of weld joint with a small heat input as follows: the parent metal < weld metal< heat affected zone; the corrosion resistance in each region of weld joint with a large heat input as follows: the parent metal < heat affected zone < weld metal. The results are related with the different zones microstructure of weld joint. Compared two kinds of weld joint total corrosion rate, the large heat input joint has better corrosion resistance.
  • (1) 随着热输入增大,焊缝金属中针状铁素体减少,而热影响区中针状铁素含量增多,甚至出现魏氏组织.(2) 在模拟油田输出液中,两种接头不同区域的开路电位均不相同.(3) 小热输入焊接接头不同区域腐蚀速率从小到大依次为热影响区,焊缝,母材;大热输入焊接接头不同区域腐蚀速率从小到大依次为焊缝,热影响区,母材. 两种接头总腐蚀速率相比,热输入大的接头耐蚀性较好.参考文献:[1] 张振永. 长输油气管道焊接方法及焊材选用[J]. 焊管, 2004, 27(2): 37-42.Zhang Zhenyong. Long distance oil and gas pipeline welding method and welding material selection[J]. Welded Pipe and Tube, 2004, 27(2): 37-42.[2] Alizadeh M, Bordbar S. The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution[J]. Corrosion Science, 2013, 70: 170-179.[3] Avendano-Castro C, Galvan-Martinez R, Contreras A,et al. Corrosion kinetics of pipeline carbon steel weld immersed in aqueous solution containing H2S[J]. Corrosion Engineering, Science and Technology, 2009, 44(2): 149-156.[4] 胡丽华, 张 雷, 许立宁, 等. 3Cr低合金管线钢及焊接接头的CO2腐蚀行为[J]. 北京科技大学学报, 2010(3): 345-350.Hu Lihua, Zhang Lei, Xu Lining,et al. CO2corrosion behavior of 3Cr low alloy pipeline steel and welded joint[J]. Journal of University of Science and Technology Beijing, 2010(3): 345-350.[5] 范 舟, 刘建仪. X70管线钢焊接接头组织及其海水腐蚀规律[J]. 西南石油大学学报(自然科学版), 2009, 31(5): 171-174.Fan Zhou, Liu Jianyi. X70 pipeline steel welding joint organization and corrosion behavior of the sea water[J]. Journal of Southwest Petroleum University (Natural Science Edition), 2009, 31(5): 171-174.[6] 唐 君, 刘 峰. X80钢焊接接头在酸性模拟液中的电化学腐蚀[J]. 辽宁石油化工大学学报, 2012, 31(4): 60-63.Tang Jun, Liu Feng. The electrochemical corrosion of X80 steel welded joint in the acid analog solution[J]. Journal of Liaoning University of Petroleum Chemical Industry, 2012, 31(4): 60-63.[7] 周贤良, 李晖榕, 华小珍, 等. X80管线钢埋弧焊焊接接头的组织和腐蚀性能[J]. 焊接学报, 2011, 32(1): 37-40,80.Zhou Xianliang, Li Huirong, Hua Xiaozhen,et al. Microstructures and corrosion properties of submerged arc welded joint for X80 pipeline steel[J]. Tansactions of the China Welding Institution, 2011, 32(1): 37-40,80.[8] 张俊旺, 王文先, 黄延平, 等. 奥氏体不锈钢焊缝金属的电化学腐蚀性能[J]. 焊接学报, 2007, 28(2): 103-107.Zhang Junwang, Wang Wenxian, Huang Yanping,et al. Electrochemical corrosion properties for weld metal of austenitic stainless steel[J]. Tansactions of the China Welding Institution, 2007, 28(2): 103-107.[9] 王凤平. 腐蚀电化学原理, 方法及应用[M]. 北京: 化学工业出版社, 2008.[10] Huang L, Brown B, Nesic S. Investigation of Environmental Effects on Intrinsic and Galvanic Corrosion of Mild Steel Weldment in CO2 Environment[C]∥Houston: NACE International Publications Division, 2014: 1-15.[11] Farelas F, Galicia M, Brown B,et al. Evolution of dissolution processes at the interface of carbon steel corroding in a CO 2 environment studied by EIS[J]. Corrosion Science, 2010, 52(2): 509-517.[12] 黄安国, 李志远, 余圣甫, 等. 低合金钢焊缝金属的腐蚀行为[J]. 焊接学报, 2005, 26(11): 30-34.Huang Anguo, Li Zhiyuan, Yu Shengfu,et al. Corrosion behavior of low alloy steel weld metal[J]. Tansactions of the China Welding Institution, 2005, 26(11): 30-34.
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