高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (12): 2556-.doi: 10.7503/cjcu20190370

• 物理化学 • 上一篇    下一篇

甲基丙烯酸二甲氨基乙酯类离子液体对Q235钢的缓蚀性能

董秋辰1,张光华1,*(),张万斌2,张雪1,刘晶1   

  1. 1. 陕西科技大学, 陕西省轻化工助剂重点实验室
    2. 陕西省轻化工助剂化学与技术协同创新中心, 西安 710021
  • 收稿日期:2019-07-03 出版日期:2019-12-04 发布日期:2019-12-04
  • 通讯作者: 张光华 E-mail:zhanggh@sust.edu.cn
  • 基金资助:
    国家自然科学基金(31670596);陕西省教育厅重点实验室科研计划项目(14JS015)

Corrosion Inhibition of Q235 Steel by Ionic Liquid Based on the 2-(Dimethylamino)ethyl Methacrylate

Qiuchen DONG1,Guanghua ZHANG1,*(),Wanbin ZHANG2,Xue ZHANG1,Jing LIU1   

  1. 1. Shaanxi Key Laboratory of Chemical Additives for Industry
    2. Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, Shaanxi University of Science and Technology, Xi’an 710021, China;
  • Received:2019-07-03 Online:2019-12-04 Published:2019-12-04
  • Contact: Guanghua ZHANG E-mail:zhanggh@sust.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(31670596);the Shaanxi Provincial Department of Education Key Laboratory Research Projects, China(14JS015)

摘要:

以甲基丙烯酸二甲氨基乙酯为母体、 对氯甲基苯乙烯为季铵化试剂, 合成了一种具有疏水结构的甲基丙烯酸二甲氨基乙酯型离子液体(DEMA). 通过失重实验、 电化学分析、 原子力显微镜(AFM)、 接触角测试和量子化学计算等研究了DEMA在1 mol/L盐酸中对Q235钢的缓蚀性能, 并揭示了其在Q235钢表面的吸附行为和吸附机理. 失重实验结果表明, DEMA在盐酸中对Q235钢具有优异的缓蚀效果, 且在较高温度(60 ℃)下也能保持高效吸附; 电化学实验结果与失重测试结果一致; 接触角测试结果表明, DEMA可明显增强Q235钢表面的疏水性; 分析热力学参数可知, DEMA在Q235钢表面的吸附为自发、 放热过程, 符合Langmuir等温式, 且以化学吸附为主; 量子化学计算结果证实DEMA的结构中包含大量吸附活性位点.

关键词: 缓蚀剂, 离子液体, 吸附, 量子化学, 缓蚀机理

Abstract:

A 2-(dimethylamino)ethyl methacrylate type ionic liquid with hydrophobic structure(DEMA) was prepared from 2-(dimethylamino)ethylmethacrylate and 4-vinylbenzyl chloride. The corrosion inhibitory property of DEMA on Q235 steel in 1 mol/L hydrochloric acid solution and their adsorption behavior on Q235 steel surface were studied by means of mass loss measurement, electrochemical technique, force microscopy(AFM), contact angle measurement and quantum chemical calculation. The mass loss results show that DEMA has good corrosion inhibition effect on Q235 steel in hydrochloric acid, and it can maintain strong adsorption at higher temperature(60 ℃). The results of electrochemical tests are consistent with that of mass loss test. Contact angle test results show that DEMA can significantly enhance the hydrophobicity of the surface of Q235 steel. Thermodynamic and activation energy parameters show that the adsorption of DEMA on Q235 steel surface is spontaneous and exothermic, conforming to the Langmuir’s adsorption isotherm and mainly based on chemical adsorption. Quantum chemical calculation results show that the entire structure of DEMA contains a large number of adsorbed active sites. Thermogravimetric analysis(TGA) shows that DEMA has good thermostability. DEMA has the advantages of mild preparation condition, good thermal stability and excellent corrosion inhibition performance, thus it has important industrial application value and theoretical reference. At the same time, the studies also provide a new idea for the structural design of corrosion inhibitor.

Key words: Corrosion inhibitor, Ionic liquid, Adsorption, Quantum chemical, Inhibition mechanism

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