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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (16): 1851-1857. 上一篇    下一篇

研究论文

新型不对称双季铵盐缓蚀剂在HCl中对Q235钢的缓蚀行为

宋伟伟，张静*，杜敏   

  1. (中国海洋大学化学化工学院 海洋化学理论与工程技术教育部重点实验室 青岛 266100)
  • 投稿日期:2010-12-18 修回日期:2011-03-21 发布日期:2011-04-19
  • 通讯作者: 张静 E-mail:dmh217@ouc.edu.cn
  • 基金资助:

    咪唑啉双季铵盐的研制及其在碳钢表面的吸附与缓蚀机理研究

Inhibition Performance of Novel Dissymmetric Bisquaternary Ammonium Salt to Q235 Steel in Hydrochloric Acid

SONG Wei-Wei, ZHANG Jing, DU Min   

  1. (Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100)
  • Received:2010-12-18 Revised:2011-03-21 Published:2011-04-19

PDF

1085

被引次数

65

采用静态失重法、极化曲线法和交流阻抗法研究了自制的含咪唑啉环不对称双季铵盐缓蚀剂(DBA)在1 mol•L－1 HCl介质中对Q235钢的缓蚀性能, 并探讨了其在Q235钢表面的吸附行为. 结果表明, 缓蚀效率随DBA浓度增加而增大, 在25～55 ℃的实验温度范围内, 浓度为2.89×10－4 mol•L－1时, 缓蚀效率均在90%以上, 且缓蚀效率随温度升高而增大. 极化曲线测试显示DBA是一种阴极抑制为主的混合型缓蚀剂. 缓蚀剂在Q235钢表面的吸附过程为吸热过程, 其在Q235钢表面的吸附遵循Langmuir等温式, 属于化学吸附. 最后采用量子化学方法对DBA的缓蚀机理做了进一步分析.

关键词: 缓蚀剂, 不对称双季铵盐, 缓蚀性能, 吸附, 量子化学

The inhibition effect and adsorption behavior of a novel dissymmetric bisquaternary ammonium salt (DBA) for Q235 steel in 1 mol•L－1 HCl solution were investigated using weight loss measurements, polarization curve and electrochemical impedance spectroscopy (EIS) methods. The results showed that inhibition efficiency increased with the increase of concentration, and its inhibition efficiency was above 90% at a concentration of 2.89×10－4 mol•L－1. The inhibition efficiency increased gradually in the temperature range of 25～55 ℃. Polarization curve results revealed that DBA was a mix-type inhibitor which mainly inhibited cathodic process. The adsorption processes were endothermic and belonged to the chemical adsorption, obeying the Langmuir isotherm. The relationship between the molecular structure of DBA and the inhibition efficiency was investigated using quantum chemical calculations.

Key words: corrosion inhibitor, dissymmetric bisquaternary ammonium salt, corrosion inhibition, adsorption, quantum chemistry

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