石油化工高等学校学报

石油化工高等学校学报

• 油气储运 • 上一篇    下一篇

HCO〖_(3)^-〗对X100管线钢在海洋环境中电化学腐蚀行为影响

刘广鑫1,2吴明1谢飞1宫克1,2   

  1. (1. 辽宁石油化工大学 石油天然气工程学院,辽宁 抚顺 113001; 2. 中国石油大学(华东) 储运与建筑工程学院,山东 青岛 266580)
  • 收稿日期:2019-01-03 修回日期:2019-01-28 出版日期:2019-05-01 发布日期:2019-05-08
  • 通讯作者: 吴明(1961⁃),男,博士,教授,博士生导师,从事油气管道长距离安全输送技术研究;E⁃mail:wuming0413@163.com。
  • 作者简介:刘广鑫(1989-),男,博士研究生,从事油气管道长距离安全输送技术研究; E?mail:liuguangxin5@126.com。
  • 基金资助:
    国家自然科学基金项目(51574147)。

Effect of HCO〖_(3)^-〗 on Electrochemical Corrosion Behavior of X100 Pipeline Steel in Marine Environment

Liu Guangxin1,2Wu Ming1Xie Fei1Gong Ke1,2   

  1. (1. College of Petroleum Engineering, Liaoning Shihua University,Fushun Liaoning 113001,China ; 2. College of Pipeline and Civil Engineering, China University of Petroleum(East China),Qingdao Shandong 266580,China)
  • Received:2019-01-03 Revised:2019-01-28 Online:2019-05-01 Published:2019-05-08

摘要: 海洋环境中油气管线钢腐蚀是破坏油气管线完整性的重要因素之一。在模拟海洋溶液中,采用动电位极化和交流阻抗技术研究了不同HCO〖_(3)^-〗浓度对X100钢的电化学腐蚀行为影响。结果表明,HCO〖_(3)^-〗浓度在2.5×10-3~0.5 mol/L,随HCO〖_(3)^-〗浓度的升高,X100钢腐蚀电流密度随之增大,且金属表面腐蚀坑的数量和面积不断增加;此外,当HCO〖_(3)^-〗浓度为0.1、0.5 mol/L时,X100钢阳极极化曲线出现了过渡钝化区,金属表面形成了不稳定产物膜。

关键词: X100管线钢, 电化学腐蚀, 海洋环境, HCO〖_(3)^-〗, 动电位极化

Abstract: Corrosion of oil and gas pipeline steel in the marine environment is one of the important factors that damage the integrity of oil and gas pipelines. The effects of different HCO〖_(3)^-〗 concentrations in simulated ocean solution on the electrochemical corrosion behavior of X100 steel were investigated by using potentiodynamic polarization and AC impedance technique. The results showed that the corrosion current density, the corrosion pits number and area of X100 steel increased with increasing of HCO〖_(3)^-〗 ion concentration. In addition, when HCO〖_(3)^-〗concentration was 0.1 and 0.5 mol/L, transition passivation zone appeared in the anodic polarization curve of X100 steel, and unstable product film was formed on the metal surface.

Key words: X100 pipeline steel, Electrochemical corrosion, Marine environment, Bicarbonate, Potentiodynamic polarization