ABSTRACT The efficacy of 1-butyl-1-methylpiperidinium tetrafluoroborate (BMPTFB) in retarding St37 steel corrosion in HCl environment has been examined using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), dynamic-EIS (DEIS), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) techniques. Results from all applied methods reveal that BMPTFB is effective in suppressing St37 dissolution in the studied corrosive medium. Inhibition efficiency of 88% has been achieved by 4 mM BMPTFB. From DEIS results, BMPTFB is found to perform better as corrosion inhibitor at longer immersion time. The charge transfer resistance of the metal is raised in the presence of 4 mM BMPTFB from 378 to 744 Ω cm2 at 1 h and further increased to 867 Ω cm2 at 4 h. BMPTFB, according to PDP result behaves as mixed-type corrosion inhibitor. Corrosion inhibition by BMPTFB is via adsorption which can best be explained using El-Awady kinetic/thermodynamic adsorption isotherm. Kads and values indicate that physisorption is the mechanism of adsorption of BMPTFB molecules onto St37 surface. The presence of BMPTFB molecules on St37 surface has been verified by SEM and FTIR.

中文翻译：

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1-丁基-1-甲基哌啶鎓四氟硼酸盐对St37钢在HCl环境中溶解行为的影响

摘要 使用动电位极化 (PDP)、电化学阻抗谱 (EIS)、动态 EIS (DEIS)、扫描电子显微镜检查了 1-丁基-1-甲基哌啶鎓四氟硼酸盐 (BMPTFB) 在 HCl 环境中延缓 St37 钢腐蚀的功效(SEM) 和傅里叶变换红外光谱 (FTIR) 技术。所有应用方法的结果表明，BMPTFB 可有效抑制 St37 在所研究的腐蚀性介质中的溶解。4 mM BMPTFB 已实现 88% 的抑制效率。根据 DEIS 结果，发现 BMPTFB 作为腐蚀抑制剂在较长的浸泡时间下表现更好。在 4 mM BMPTFB 存在下，金属的电荷转移电阻在 1 小时时从 378 Ω cm2 增加到 744 Ω cm2，并在 4 h 时进一步增加到 867 Ω cm2。BMPTFB, 根据PDP结果表现为混合型缓蚀剂。BMPTFB 的腐蚀抑制是通过吸附进行的，这可以使用 El-Awady 动力学/热力学吸附等温线进行最好的解释。Kads 和值表明物理吸附是 BMPTFB 分子吸附到 St37 表面的机制。SEM 和 FTIR 已证实 St37 表面上存在 BMPTFB 分子。