This study investigates the corrosion inhibition properties of two recently synthesized Schiff bases, namely 4-bromo-2-(((2-((2-hydroxyethyl)amino)ethyl)imino)methyl)phenol (BHA) and phenyl-2-(((2-((2-hydroxyethyl)amino)ethyl)imino)methyl)phenol (PHA), for copper in a 3.5 wt% NaCl solution. The novelty of this work lies in the use of these Schiff bases, which have not been previously studied in this context, thereby providing new insights into their potential as effective copper corrosion inhibitors. The inhibition performance of the Schiff bases was evaluated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The potentiodynamic polarization results demonstrated high corrosion inhibition efficiencies of 85.16 % for PHA and 82.78 % for BHA at a concentration of 1 mM, indicating a mixed-type inhibition process with cathodic predominance. The adsorption of these inhibitors on the copper surface was found to follow the Langmuir adsorption isotherm, and the adsorption constants (Kads) and Gibbs free energies (ΔG*ads) were calculated. Quantum chemical calculations, in conjunction with Monte Carlo (MC) and molecular dynamics (MD) simulations, provided further insight into the adsorption mechanisms and supported experimental findings, thus offering a comprehensive understanding of the inhibitors’ efficacy.

中文翻译：

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新型希夫碱衍生物：增强 NaCl 溶液中铜的防腐蚀保护 – 电化学见解和理论分析


本研究研究了两种最近合成的希夫碱的腐蚀抑制性能，即 4-溴-2-（（（2-（（2-羟乙基）氨基）乙基）亚氨基）甲基）苯酚 （BHA） 和苯基-2-（（（2-（（2-羟乙基）氨基）乙基）亚氨基）甲基）苯酚 （PHA），用于铜在 3.5 wt% NaCl 溶液中的腐蚀。这项工作的新颖之处在于这些希夫碱的使用，这些碱以前没有在这方面进行过研究，从而为它们作为有效铜缓蚀剂的潜力提供了新的见解。使用动电位极化 （PDP） 和电化学阻抗谱 （EIS） 评估 Schiff 碱的抑制性能。动电位极化结果表明，在 1 mM 浓度下，PHA 和 BHA 的腐蚀抑制效率分别为 85.16% 和 82.78%，表明阴极为主的混合型抑制过程。发现这些抑制剂在铜表面的吸附遵循 Langmuir 吸附等温线，并计算了吸附常数 （Kads） 和吉布斯自由能 （ΔG*ads）。量子化学计算与蒙特卡洛 （MC） 和分子动力学 （MD） 模拟相结合，进一步了解了吸附机制并支持实验结果，从而全面了解抑制剂的功效。