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(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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