The weak corrosion resistance of mild steel (MS) is considered a severe problem in many industrial applications. The application of corrosion inhibitors is suggested to mitigate the corrosion of steel. Within this framework, a series of novel inhibitors, including 4-ferrocenylbutyl formate, 4-ferrocenylbutyl acrylate, and 4-ferrocenylbutyl phenylacetate, was synthesized and subsequently characterized using ¹H NMR, ¹³C NMR, and FT-IR spectroscopies. The corrosion inhibition properties of synthesized components were evaluated for MS in 1 M HCl solution through electrochemical impedance spectroscopy (EIS), Tafel, Atomic force microscopy (AFM), and scanning electron microscopy (SEM). SEM images showed the presence of a protective layer on the steel surface in the presence of inhibitors. This thick layer, visible to the naked eye, is responsible for a significant resistance against corrosion. EIS data indicated that the inhibition efficiency of 4-ferrocenylbutyl formate (C) increased from 92% to 94% after 14 days of immersion in 1 M HCl. Furthermore, the results show that the R_ct of inhibited MS after 2 h increased from 57 to 880 Ω cm² in 4 mM C inhibitor, and it enhanced to 1870 Ω cm² after 170 h toward the uninhibited surface. Proposed inhibitors have extraordinary adsorption abilities on the metal surface to increase corrosion protection, improving this adsorption over time. Besides, the potentiodynamic polarization results disclosed that steel corrosion protection after two weeks of immersion in the acidic solution containing (C) inhibitor was about 20 times higher than the inhibitor-free solution. Synthesized ferrocenylbutyl derivatives can be utilized for prolonged corrosion inhibition purposes. Furthermore, density functional theory calculations revealed a linear correlation between the adsorption energies and charge-transfer values of studied 4-ferrocenylbutyl derivated and their inhibition capacity.

低碳钢 (MS) 的弱耐腐蚀性被认为是许多工业应用中的一个严重问题。建议使用缓蚀剂来减轻钢的腐蚀。在此框架内，合成了一系列新型抑制剂，包括 4-二茂铁甲酸丁酯、4-二茂铁丙烯酸丁酯和 4-二茂铁苯乙酸丁酯，随后使用¹ H NMR、^{13对其进行了表征。}C NMR和FT-IR光谱。通过电化学阻抗谱 (EIS)、Tafel、原子力显微镜 (AFM) 和扫描电子显微镜 (SEM) 在 1 M HCl 溶液中对合成部件的缓蚀性能进行了评估。SEM 图像显示，在存在抑制剂的情况下，钢表面存在保护层。这种肉眼可见的厚层具有显着的抗腐蚀能力。EIS 数据表明，在 1 M HCl 中浸泡 14 天后，4-二茂铁基甲酸丁酯 (C) 的抑制效率从 92% 提高到 94%。此外，结果表明，在 4 mM C 抑制剂中，抑制 MS 2 h 后的 R _ct从 57 增加到 880 Ω cm ²，并提高到 1870 Ω cm ²170 小时后朝向不受约束的表面。所提出的抑制剂在金属表面具有非凡的吸附能力，可增加腐蚀保护，随着时间的推移改善这种吸附。此外，动电位极化结果表明，在含有（C）缓蚀剂的酸性溶液中浸泡两周后，钢材的腐蚀保护能力比不含缓蚀剂的溶液高出约 20 倍。合成的二茂铁基丁基衍生物可用于延长腐蚀抑制目的。此外，密度泛函理论计算揭示了所研究的 4-二茂铁丁基衍生物的吸附能和电荷转移值与其抑制能力之间的线性相关性。