| [BMIM]HSO4离子液体腐蚀性的实验与分子模拟 |
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| 引用本文： | 张晋玮,成洪业,陈立芳,漆志文.[BMIM]HSO4离子液体腐蚀性的实验与分子模拟[J].化工学报,2018,69(2):808-814. |
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| 作者姓名： | 张晋玮 成洪业 陈立芳 漆志文 |
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| 作者单位： | 化学工程联合国家重点实验室, 华东理工大学, 上海 200237 |
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| 基金项目： | 国家自然科学基金项目（21406063，U1462123）。 |
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| 摘 要： | 基于失重法和分子模拟方法，研究了1-丁基-3-甲基咪唑硫酸氢盐（BMIM]HSO4）的腐蚀性和离子液体分子与金属表面的相互作用。实验结果表明BMIM]HSO4对304不锈钢具有腐蚀性，且在水溶液中腐蚀性显著增强。基于量子化学方法计算了BMIM]HSO4分子的HOMO和LUMO分布、Fukui指数及分子内部特征参数，计算结果表明BMIM]HSO4在Fe金属表面吸附的位置主要集中在阴离子硫酸氢根和阳离子咪唑环上，可分别形成配位键和反馈键，在水溶液中BMIM]HSO4分子与金属表面的相互作用变弱。分子动力学模拟揭示了在不同的环境中BMIM]HSO4分子在Fe金属表面的吸附过程和吸附能。量子化学计算和分子动力学模拟结果一致，从理论上解释了在水溶液中BMIM]HSO4腐蚀性增强的原因。
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| 关 键 词： | 离子液体 腐蚀 失重法 分子模拟 量子化学计算 分子动力学模拟 |
| 收稿时间： | 2017-03-10 |
| 修稿时间： | 2017-06-08 |
Experimental and molecular simulation of corrosion of steel in [BMIM]HSO4 ionic liquid |
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| ZHANG Jinwei,CHENG Hongye,CHEN Lifang,QI Zhiwen.Experimental and molecular simulation of corrosion of steel in [BMIM]HSO4 ionic liquid[J].Journal of Chemical Industry and Engineering(China),2018,69(2):808-814. |
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| Authors: | ZHANG Jinwei CHENG Hongye CHEN Lifang QI Zhiwen |
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| Affiliation: | State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | The corrosion behaviors of steel inBMIM]HSO4 ionic liquid (IL) were investigated by immersion tests and molecular simulation. The corrosion rates of stainless steel 304 in IL were determined by mass loss measurement. The result indicates that the presence of H2O greatly enhances the corrosivity of IL. The distribution of HOMO and LUMO, Fukui indices and quantum chemical parameters on IL molecule were calculated. The results show that the imidazolium ring and hydrogen sulfate play the most important role in the interaction between IL and metal surface. The quantum chemical parameters of IL in aqueous solution significantly change. The chemical adsorption ability of IL becomes weak. The adsorption process and adsorption energy of IL on steel surface in water-free and aqueous environments were investigated by molecular dynamics simulation. The molecular simulation results are consistent well with corrosion results, which can provide a better understanding of the interaction between ionic liquid and metal surface at the molecular level. |
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| Keywords: | ionic liquids corrosion mass loss measurement molecular simulation quantum chemical calculation molecular dynamic simulation |
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