Effects of CO2 and H2S on Electrochemical Corrosion Behavior of FV520B Stainless Steel in NaCl Solution
摘 要
采用动电位极化和电化学阻抗谱研究了FV520B不锈钢在3.5%(质量分数,下同)NaCl溶液以及在分别通入CO2、H2S、CO2+H2S气体的3.5% NaCl溶液中的电化学腐蚀行为。结果表明:在3.5% NaCl溶液中通入CO2或H2S时,试验钢的开路电位负移,极化电阻减小,耐腐蚀性能变差;试验钢在4种腐蚀介质中的极化曲线均呈阳极溶解特征,在3.5% NaCl和通入CO2的3.5% NaCl溶液中,腐蚀受阳极过程控制,在通入H2S的3.5% NaCl溶液中,腐蚀受阴极过程控制,而在同时通入CO2和H2S的3.5% NaCl溶液中,腐蚀受阴极和阳极过程共同控制。
Abstract
Electrochemical corrosion behavior of FV520B stainless steel in 3.5wt% NaCl solution and in 3.5wt% NaCl solutions containing CO2, H2S and CO2+H2S, respectively, was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that the open circuit potential of the test steel shifted to the negative direction, the polarization resistance decreased and the corrosion resistance became worse. The polarization curves of the test steel in four corrosive media showed anodic dissolution characteristics. In the 3.5wt%NaCl and 3.5wt%NaCl+CO2 solutions, the corrosion was dominated by anodic reaction; in the 3.5wt%NaCl+H2S solution, the corrosion was dominated by cathodic reaction; the corrosion was dominated by the anodic and cathodic reaction when H2S and CO2 coexisted in the 3.5wt%NaCl solution.
中图分类号 TG174 DOI 10.11973/jxgccl201910003
所属栏目 试验研究
基金项目 西安石油大学校级青年科研创新团队资助项目(2019QNKYCXTD12);国家自然科学基金资助项目(51704239)
收稿日期 2019/2/28
修改稿日期 2019/8/20
网络出版日期
作者单位点击查看
备注雒设计(1979-),男,陕西礼泉人,副教授,博士
引用该论文: LUO Sheji,ZHAO Qing,RAN Zhaohui,YIN Shuzheng,WANG Qingguo,LIU Jun,CHEN Yang. Effects of CO2 and H2S on Electrochemical Corrosion Behavior of FV520B Stainless Steel in NaCl Solution[J]. Materials for mechancial engineering, 2019, 43(10): 11~14
雒设计,赵庆,冉照辉,尹书争,王庆国,刘君,陈阳. CO2和H2S对FV520B不锈钢在NaCl溶液中电化学腐蚀行为的影响[J]. 机械工程材料, 2019, 43(10): 11~14
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参考文献
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【3】FANTECHI F, INNOCENTI M. Chloride stress corrosion cracking of precipitation hardening S.S. impellers in centrifugal compressor:Laboratory investigations and corrective actions[J]. Engineering Failure Analysis, 2001, 8(5):477-492.
【4】韩增福, 张飞雄. 离心叶轮用FV520B材料真空钎焊工艺研究[J]. 通用机械, 2003(7):31-33.
【5】张敏, 刘明志, 张明, 等. 奥氏体化合金元素Mn和Ni对FV520B焊缝组织与力学性能的影响[J]. 材料工程, 2016, 44(3):40-45.
【6】徐滨士, 方金祥, 董世运, 等. FV520B不锈钢激光熔覆热影响区组织演变及其对力学性能的影响[J]. 金属学报, 2016, 52(1):1-9.
【7】WANG J L, ZHANG Y L, LIU S J, et al. Competitive giga-fatigue life analysis owing to surface defect and internal inclusion for FV520B-I[J]. International Journal of Fatigue, 2016, 87:203-209.
【8】ZHANG M, WANG W Q, WANG P F, et al. Fatigue behavior and mechanism of FV520B-I welding seams in a very high cycle regime[J]. International Journal of Fatigue, 2016, 87:22-37.
【9】孙蛟, 陈颂英, 丁进, 等. FV520B钢在H2S/CO2环境下的应力腐蚀[J]. 东北大学学报(自然科学版), 2015, 36(12):1790-1794.
【10】陈丰君,杜晓东,郎经纬,等.FV(520)B不锈钢高温高压条件下硫化腐蚀机理[J].材料热处理学报,2015,36(6):211-215.
【11】宋诗哲. 腐蚀电化学研究方法[M]. 北京:化学工业出版社, 1988:120.
【12】PAN J Y, XIANG L H, CHEN S Y, et al. Experimental study on electrochemical corrosion of FV520B in natural gas environment[J]. Results in Physics, 2017, 7:4405-4411.
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