Page 206 - 《精细化工》2020年第5期

第 37 卷第 5 期 精 细 化 工 Vol.37, No.5
202 0 年 5 月 FINE CHEMICALS May 2020

建筑用化学品
两种甲基丙烯酸二甲氨乙酯基季铵盐的

合成及缓蚀性能

张光华，刘 晶，董秋辰，倪美乐，罗 杰，杨冬冬

（陕西科技大学 陕西省轻化工助剂重点实验室，陕西 西安 710021）

摘要：以甲基丙烯酸二甲氨乙酯为母体，分别以氯丙烯和氯化苄为桥连基设计合成了两种季铵盐（DMA-Ⅰ和
DMA-Ⅱ）。利用红外光谱、核磁共振氢谱证实所得产物与设计相一致。通过失重实验、电化学实验、AFM、接
触角等手段测试了 Q235 钢在含有 DMA-Ⅰ和 DMA-Ⅱ的 1mol/L 盐酸中的缓蚀性能，探讨了其在 Q235 钢表面的
吸附和缓蚀机理。结果显示：在较高温度下，DMA-Ⅰ和 DMA-Ⅱ仍能牢固吸附在 Q235 钢表面，当所加入缓蚀
剂的质量浓度为 100 mg/L 时，缓蚀率均可达 92.7%以上，显示出良好的缓蚀性能，且 DMA-Ⅰ比 DMA-Ⅱ具有更
好的缓蚀效果。热力学计算结果表明，DMA-Ⅰ和 DMA-Ⅱ在 Q235 钢表面的吸附是化学吸附，过程自发、放热，
且符合 Langmuir 等温吸附，属于良好的阳极型缓蚀剂。量子化学计算进一步研究了 DMA-Ⅰ和 DMA-Ⅱ的分子
结构与活性位点，结果表明，DMA-Ⅰ更容易提供或接受电子。
关键词：Q235 钢；缓蚀；电化学；量子化学计算；Langmuir 吸附；表面活性剂；建筑用化学品
中图分类号：O647.32 文献标识码：A 文章编号：1003-5214 (2020) 05-1056-09

Synthesis and corrosion inhibition of two kinds of 2-(dimethylamino)ethyl

methacrylate quaternary ammonium salts

ZHANG Guanghua, LIU Jing, DONG Qiuchen, NI Meile, LUO Jie, YANG Dongdong
（Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an
710021, Shaanxi, China）

Abstract: Two kinds of quaternary ammonium salts (DMA-Ⅰand DMA-Ⅱ) were designed and synthesized
by using 2-(dimethylamino)ethyl methacrylate as matrix, and chloropropene and benzyl chloride as
bridging groups, respectively. The obtained products were confirmed to be consistent with the designed by
infrared spectroscopy and nuclear magnetic resonance spectroscopy. Their corrosion inhibition were
evaluated on Q235 steel in 1 mol/L hydrochloric acid by weight loss measurement, electrochemical
impedance spectroscopy (EIS), AFM and contact angle tests. All results showed that DMA-Ⅰand DMA-Ⅱ
could still firmly adsorb on the surface of Q235 steel at higher temperature. When the mass concentration of
DMA-Ⅰor DMA-Ⅱ was 100 mg/L, the inhibition efficiency still reached over 92.7%. They exhibited
excellent corrosion inhibition effects on Q235 steel in hydrochloric acid. Furthermore, DMA-Ⅰhad better
corrosion inhibition effect than DMA-Ⅱ. The thermodynamic calculation results revealed that the
adsorption of DMA-Ⅰand DMA-Ⅱ on the surface of Q235 steel was chemical adsorption of the
spontaneous exothermic process. The adsorption process was consistent with the Langmuir isotherm
adsorption model. DMA-Ⅰand DMA-Ⅱ were anodic corrosion inhibitors. The molecular structure and
active sites of DMA-Ⅰand DMA-Ⅱ were further studied by quantum chemical calculation. The results
showed that DMA-Ⅰwas easier to provide or accept electrons.
Key words: Q235 steel; corrosion inhibition; electrochemistry; quantum chemical calculation; Langmuir
adsorption; surfactants; building chemicals

收稿日期：2019-10-22; 定用日期：2020-01-13; DOI: 10.13550/j.jxhg.20191002
基金项目：国家自然科学基金（31670596）；陕西省重点研发计划项目（2020GY-232）
作者简介：张光华（1968—），男，教授， E-mail：zhanggh@sust.edu.cn。