物理化学学报 >> 2009, Vol. 25 >> Issue (04): 713-718.doi: 10.3866/PKU.WHXB20090417

研究论文 上一篇    下一篇

流动条件下两种不同亲水基团咪唑啉型缓蚀剂的缓蚀性能

刘瑕 郑玉贵   

  1. 中国科学院金属研究所, 金属腐蚀与防护国家重点实验室, 沈阳 110016; 沈阳化工学院应用化学学院, 沈阳 110142
  • 收稿日期:2008-10-09 修回日期:2008-12-29 发布日期:2009-03-31
  • 通讯作者: 郑玉贵 E-mail:ygzheng@imr.ac.cn

Inhibition Behavior of Two Imidazoline-Based Inhibitors with Different Hydrophilic Groups in Single Liquid Phase and Liquid/Particle Two-Phase Flow

 LIU Xia, ZHENG Yu-Gui   

  1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China; Department of Applied Chemistry, Shenyang Institute of Chemical Technology, Shenyang 110142, P. R. China
  • Received:2008-10-09 Revised:2008-12-29 Published:2009-03-31
  • Contact: ZHENG Yu-Gui E-mail:ygzheng@imr.ac.cn

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摘要：

选择了两种含有不同亲水基团的咪唑啉型缓蚀剂, 即1-胺乙基-2-十一烷基咪唑啉(AEI-11)和1-羟乙基-2-十一烷基咪唑啉(HEI-11), 分别在静态及动态条件下,采用失重法、极化曲线法、电化学阻抗谱法研究了上述缓蚀剂对N80钢在CO2饱和的3%(w)NaCl溶液中的缓蚀性能. 研究结果表明, 无论在静态和动态条件下, HEI-11均表现出更佳的缓蚀性能, 即咪唑啉型缓蚀剂的缓蚀性能与亲水基团的极性成正比; 在流动条件为5 m·s-1时, 缓蚀剂的缓蚀效率显著降低. 为了进一步研究缓蚀剂的缓蚀性能与其结构的关系, 运用量子化学法计算了缓蚀剂的EHOMO(最高占有分子轨道)、ELUMO(最低空分子轨道), 结果表明缓蚀剂的缓蚀效率与EHOMO成正比, 与ELUMO及ELUMO与EHOMO的差值驻E成反比.

关键词: CO2腐蚀, 缓蚀剂, 咪唑啉, 液/固两相流, 量子化学计算, 亲水基团

Abstract:

Two kinds of imidazoline inhibitors with different hydrophilic groups, i.e. hydroxyethyl imidazoline (HEI-11) and aminoethyl imidazoline (AEI-11), were used for resisting CO2 corrosion of N80 steel in single liquid phase and liquid/particle two-phase flow. Inhibition performance of these imidazoline inhibitors for CO2 corrosion of N80 in 3% (w) NaCl solution was investigated using polarization curve and electrochemical impedance spectroscopy under static and flow conditions. The results showed that the inhibition efficiency under both static and flow conditions increased according to the following: HEI-11>AEI-11. The inhibition performance of both inhibitors was severely degraded by single liquid phase and liquid/particle two-phase flowat5m·s-1. Additionally, quantumchemical calculation was carried out to correlate the inhibition performance of both inhibitors with their chemical structures and to explain the inhibition mechanism. The theoretical calculation was in good agreement with experimental results.

Key words: Carbon dioxide corrosion, Corrosion inhibitor, Imidazoline, Liquid/particle two-phase flow, Quantum chemical calculation, Hydrophilic group

MSC2000: 

  • O646