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烷基吡啶离子液体作为酸性介质中低碳钢的绿色缓蚀剂。

Alkyl pyridine ionic liquid as a green corrosion inhibitor for mild steel in acidic medium.

作者信息

Luo Fang, Yao Pei, Zhang Jiale, Li Entian

机构信息

School of Petroleum Engineering, Changzhou University Wujin District Changzhou 213164 Jiangsu PR China

Department of Chemistry and Materials Engineering, Changzhou Vocational Institute of Engineering Changzhou 213164 Jiangsu PR China.

出版信息

RSC Adv. 2025 Aug 1;15(33):27369-27387. doi: 10.1039/d5ra04148a. eCollection 2025 Jul 25.

DOI:10.1039/d5ra04148a
PMID:40757155
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12314875/
Abstract

Using electrochemical measurements, the corrosion inhibition performance of pyridine bromide ionic liquid corrosion inhibitors on low carbon steel was evaluated under different concentrations and alkyl chain lengths of anions. The optimal process conditions were obtained: at 25 °C, in a 1 M HCl corrosion medium, the 1-dodecyl-3-methylpyridine bromide ionic liquid ([CPy]Br) exhibited the best corrosion inhibition effect, with maximum inhibition rates of 94.1%. The study mechanism showed that the adsorption process was a mixed adsorption dominated by chemical adsorption. Surface analysis (SEM/EDS, XPS) and quantum chemistry results verified that [C Py]Br could form a protective film on the surface of low carbon steel and inhibit its corrosion. In addition, molecular dynamics simulations were used to analyze the adsorption behavior of corrosion inhibitor molecules on the Fe(110) surface, and the formation sequence of bond and non-bond interactions in the Fe corrosion inhibitor molecular system on the Fe(110) surface was obtained, which was consistent with the experimentally determined corrosion inhibition efficiency. The radial distribution function (RDF) showed that the adsorption mode of the corrosion inhibitor on the metal surface was a mixed adsorption dominated by chemical adsorption and supplemented by physical adsorption.

摘要

采用电化学测量方法，在不同阴离子浓度和烷基链长度条件下，评估了吡啶溴化物离子液体缓蚀剂对低碳钢的缓蚀性能。获得了最佳工艺条件：在25℃、1M HCl腐蚀介质中，1-十二烷基-3-甲基吡啶溴化物离子液体（[CPy]Br）表现出最佳缓蚀效果，最大缓蚀率为94.1%。研究机理表明，吸附过程是以化学吸附为主导的混合吸附。表面分析（SEM/EDS、XPS）和量子化学结果证实，[CPy]Br可在低碳钢表面形成保护膜并抑制其腐蚀。此外，利用分子动力学模拟分析了缓蚀剂分子在Fe(110)表面的吸附行为，得到了Fe(110)表面Fe-缓蚀剂分子体系中键合和非键相互作用的形成顺序，这与实验测定的缓蚀效率一致。径向分布函数（RDF）表明，缓蚀剂在金属表面的吸附模式是以化学吸附为主导、物理吸附为辅的混合吸附。

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本文引用的文献

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ACS Omega. 2024 Feb 2;9(6):6761-6772. doi: 10.1021/acsomega.3c08127. eCollection 2024 Feb 13.
2
1-Butyl-3-methylimidazolium methane sulfonate ionic liquid corrosion inhibitor for mild steel alloy: Experimental, optimization and theoretical studies.用于低碳钢合金的1-丁基-3-甲基咪唑鎓甲磺酸盐离子液体缓蚀剂：实验、优化及理论研究
Heliyon. 2023 Jul 14;9(7):e18353. doi: 10.1016/j.heliyon.2023.e18353. eCollection 2023 Jul.
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Pyridine ionic liquid functionalized bimetallic MOF solid-phase extraction coupled with high performance liquid chromatography for separation/analysis sunset yellow.
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RSC Adv. 2022 Oct 28;12(48):30928-30935. doi: 10.1039/d2ra05980k. eCollection 2022 Oct 27.