两种甲基丙烯酸二甲氨乙酯基季铵盐的合成及缓蚀性能  

Synthesis and corrosion inhibition of two kinds of 2-(dimethylamino)ethyl methacrylate quaternary ammonium salts

作　　者：张光华[1] 刘晶[1] 董秋辰 倪美乐 罗杰 杨冬冬 ZHANG Guanghua;LIU Jing;DONG Qiuchen;NI Meile;LUO Jie;YANG Dongdong(Shaanxi Key Laboratory of Chemical Aditives for Industry,Shaanxi Universiy of Science and Technology,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学,陕西省轻化工助剂重点实验室,陕西西安710021

出　　处：《精细化工》2020年第5期1056-1064,共9页Fine Chemicals

基　　金：国家自然科学基金(31670596);陕西省重点研发计划项目(2020GY-232)。

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。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.

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 

分 类 号：O647.32[理学—物理化学]