Abstract The corrosion inhibition performance of carbon steel by Benzyltributylammonium tetrachloroferrate ([BTBA]+[FeCl4]−)was investigated in 1 N HCl solution and compared with theoretical results. The electrochemical impedance results showed that [BTBA]+[FeCl4]−ionic liquid act as an effective inhibitor for carbon steel corrosion in acidic medium and maximum inhibition efficiency was found to be 99.5% at 400 ppm. The SECM results also confirmed the adsorption of [BTBA]+[FeCl4]−on carbon steel and thereby forming a relatively insulated surface at the interface. The adsorption of ferrate ionic liquid on carbon steel was found to obey Langmuir adsorption isotherm. Ionic liquid effectively inhibits anodic and cathodic reaction site thereby showed its mixed type inhibition behaviour. In presence of the inhibitor higher resistance values were obtained for impedance and polarization studies. The presence of ionic liquid and its surface protection tendency at the metal/solution interface was confirmed by SEM surface studies. UV–Vis and ATR-FTIR characterization also contributed in corroborating the complex formation between Fe2+ and ionic liquid. Monte Carlo simulation and quantum chemical parameters substantiated the experimental findings and gave further insights about the inhibition mechanism.

中文翻译：

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用扫描电化学显微镜和理论方法探索四氯铁酸盐离子液体在酸性环境中的抑制性能

摘要 研究了苄基三丁基四氯高铁酸铵([BTBA]+[FeCl4]-)在1N HCl溶液中对碳钢的缓蚀性能，并与理论结果进行了比较。电化学阻抗结果表明[BTBA]+[FeCl4]-离子液体在酸性介质中可作为碳钢腐蚀的有效抑制剂，在400 ppm 时发现最大缓蚀效率为99.5%。SECM 结果还证实了 [BTBA]+[FeCl4]-在碳钢上的吸附，从而在界面处形成了相对绝缘的表面。发现高铁酸盐离子液体在碳钢上的吸附服从朗缪尔吸附等温线。离子液体有效地抑制了阳极和阴极反应位点，从而表现出其混合型抑制行为。在抑制剂存在的情况下，阻抗和极化研究获得了更高的电阻值。SEM 表面研究证实了离子液体的存在及其在金属/溶液界面处的表面保护趋势。UV-Vis 和 ATR-FTIR 表征也有助于证实 Fe2+ 和离子液体之间的复合物形成。蒙特卡罗模拟和量子化学参数证实了实验结果，并进一步了解了抑制机制。