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Experimental and theoretical studies of five imidazolium-based ionic liquids as corrosion inhibitors for mild steel in H2S and HCl solutions
Chemical Engineering Communications ( IF 2.5 ) Pub Date : 2020-08-08 , DOI: 10.1080/00986445.2020.1802257
Fusheng Cui 1, 2 , Yuqing Ni 1, 2 , Juncheng Jiang 1, 2 , Lei Ni 1, 2 , Zhirong Wang 1, 2
Affiliation  

Abstract

In this study, the mild steel corrosion inhibition performance and the corresponding mechanisms of five imidazolium-based ionic liquids (ILs) in hydrogen sulfide (H2S) and hydrochloric acid (HCl) solutions were investigated using electrochemical experiments, weight loss measurement, morphology analysis, and quantum chemical calculation. The results revealed that these ILs inhibited the corrosion of mild steel in H2S and HCl solutions and did not change the corresponding mechanism of the corrosion reaction. The corrosion inhibition ability of these ILs decreased when the temperature increased. 1-Allyl-3-methylimidazolium bromide ([Amim]Br) exhibited the strongest mild steel corrosion inhibition capacity in H2S and HCl solutions. The corrosion inhibition capacity of the ILs can be attributed to their adsorption on metal surfaces, which obeys the Langmuir adsorption isotherm. EHOMO exhibited a higher influence than ELUMO on the corrosion inhibition performance of the imidazolium-based ILs.



中文翻译:

五种咪唑基离子液体在 H2S 和 HCl 溶液中作为低碳钢缓蚀剂的实验和理论研究

摘要

本研究采用电化学实验、失重测量、形貌等手段研究了五种咪唑基离子液体 (ILs) 在硫化氢 (H 2 S) 和盐酸 (HCl) 溶液中的低碳钢缓蚀性能及相应机理。分析和量子化学计算。结果表明,这些离子液体抑制了低碳钢在 H 2 S 和 HCl 溶液中的腐蚀,并且没有改变相应的腐蚀反应机理。当温度升高时,这些离子液体的缓蚀能力下降。1-Allyl-3-methylimidazolium bromide ([Amim]Br) 在 H 2 中表现出最强的低碳钢腐蚀抑制能力S 和 HCl 溶液。离子液体的腐蚀抑制能力可归因于它们在金属表面上的吸附,符合朗缪尔吸附等温线。E HOMO对咪唑基离子液体的缓蚀性能的影响高于E LUMO

更新日期:2020-08-08
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