物理化学学报 >> 2010, Vol. 26 >> Issue (08): 2163-2170.doi: 10.3866/PKU.WHXB20100809

电化学 上一篇    下一篇

新型咪唑啉化合物在H2S/CO2共存条件下对Q235钢的缓蚀性能

胡松青, 胡建春, 范成成, 米思奇, 张军, 郭文跃   

  1. 中国石油大学物理科学与技术学院, 山东 东营 257061
  • 收稿日期:2010-01-06 修回日期:2010-03-29 发布日期:2010-07-23
  • 通讯作者: 张军, 郭文跃 E-mail:wyguo@hdpu.edu.cn, hujianchun1217@126.com
  • 基金资助:

    中石油中青年创新基金(2008D-5006-02)、中石化普光气田缓蚀剂技术研究项目(309003)及国家大学生创新实验计划项目(091042546)资助

Corrosion Inhibition of Q235 Steel by a Novel Imidazoline Compound under H2S and CO2 Coexistence

HU Song-Qing, HU Jian-Chun, FAN Cheng-Cheng, MI Si-Qi, ZHANG Jun, GUO Wen-Yue   

  1. College of Physics Science and Technology, China University of Petroleum, Dongying 257061, Shandong Province, P. R. China
  • Received:2010-01-06 Revised:2010-03-29 Published:2010-07-23
  • Contact: ZHANG Jun, GUO Wen-Yue E-mail:wyguo@hdpu.edu.cn, hujianchun1217@126.com
  • Supported by:

    The project was supported by the CNPC Innovation Foundation(2008D-5006-02), Corrosion Inhibitor Research Program for Puguang Gas Field of Sinopec (309003) and National Innovation Experiment Program for University Students, China (091042546).

摘要:

合成了一种新型咪唑啉化合物1-(2-氨基-硫脲乙基)-2-十五烷基-咪唑啉(IM-S), 并通过失重法、电化学方法及扫描电镜等研究了IM-S在H2S/CO2共存条件下对Q235钢的缓蚀性能, 探讨了其在Q235钢表面的吸附行为. 结果显示, IM-S具有较好的抗H2S、CO2腐蚀能力, 能同时抑制碳钢腐蚀的阴、阳极反应过程, 最高缓蚀效率可达92.74%. 缓蚀剂在Q235钢表面呈单分子层吸附, 属于以化学吸附为主的混合吸附. 最后采用量子化学方法对IM-S的缓蚀机理做了进一步分析.

关键词: 缓蚀剂, 失重法, 电化学方法, 量子化学

Abstract:

We synthesized a new imidazoline compound, 1-(2-amido-thioureaethyl)- 2-pentadecyl-imidazoline (IM-S). The corrosion inhibition performance and adsorption behavior for mild steel corrosion under H2S and CO2 coexistence were investigated by weight loss method, polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results indicated that IM-S had excellent corrosion inhibition performance, and both cathodic and anodic processes of mild steel corrosion were suppressed. The highest inhibition efficiency was 92.74%. We found that the adsorption of IM-S on mild steel could be fitted to a Langmuir isotherm equation, and it belonged to a mix-type adsorption, which was mainly dominated by chemisorption. The relationship between the molecular structure of IM-S and the inhibition efficiency was investigated using quantum chemical calculations.

Key words: Corrosion inhibitor, Weight loss method, Electrochemical method, Quantum chemistry

MSC2000: 

  • O646