The corrosion and corrosion inhibition of St37 steel in 0.1 M HCl solution by 1-ethyl-3-methylimidazolium tetrafluoroborate (EMITFB) and the effect of addition of KI on the inhibitive performance of EMITFB have been examined by electrochemical [electrochemical impedance spectroscopy, potentiodynamic polarization, and dynamic electrochemical impedance spectroscopy (DEIS)] and surface examination [scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS)] techniques. Results show that EMITFB could only afford the protection of St37 steel in HCl medium on an average scale. The highest studied concentration of EMITFB (4 mM) affords optimum inhibition efficiency of 78.86% from DEIS method. Addition of iodide ions to EMITFB has beneficial effect on the inhibition efficiency; 86.10% has been achieved by addition of 1 mM KI to 4 mM EMITFB. Adsorption of EMITFB molecules onto the metal surface is via physical adsorption mechanism and follows El Awady et al. kinetic/thermodynamic adsorption isotherm model. SEM and EDS results confirm the improvement of corrosion inhibiting ability of EMITFB by iodide ions. EMITFB and EMITFB + KI behave as mixed-type corrosion inhibitor in the studied environment.

中文翻译：

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碘离子改善了钢/ HCl界面上四氟硼酸1-乙基-3-甲基咪唑鎓的性能

通过电化学[电化学阻抗光谱法，电位动力学极化法]研究了1-乙基-3-甲基咪唑四氟硼酸酯（EMITFB）在0.1 M HCl溶液中对St37钢的腐蚀和缓蚀作用以及KI的添加对EMITFB缓蚀性能的影响。 ，动态电化学阻抗谱（DEIS）和表面检查[扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）]技术。结果表明，EMITFB平均只能在HCl介质中提供对St37钢的保护。EEMIFB的最高研究浓度（4 mM）通过DEIS方法提供了78.86％的最佳抑制效率。在EMITFB中加入碘离子对抑制效率具有有益的影响。86。通过将1 mM KI添加到4 mM EMITFB中，可实现10％的性能。EMITFB分子通过物理吸附机制吸附到金属表面，遵循El Awady等人的方法。动力学/热力学吸附等温线模型。SEM和EDS结果证实了碘化物离子改善了EMITFB的腐蚀抑制能力。EMITFB和EMITFB + KI在所研究的环境中起混合型缓蚀剂的作用。