Migahed M A, Nasser Ahmed, Elfeky H, El-Rabiei M M
Egyptian Petroleum Research Institute Nasr City 11727 Cairo Egypt.
Department of Basic Science, High Institute For Engineering and Modern Technology New-Elmarg El-Qalyubia Egypt
RSC Adv. 2019 Aug 28;9(46):27069-27082. doi: 10.1039/c9ra04461b. eCollection 2019 Aug 23.
This study aims at preparing three cationic surfactants based on benzotriazole and evaluating their efficiencies as corrosion inhibitors for copper electrodes in seawater using different electrochemical techniques (potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM)). FTIR and H NMR spectroscopic techniques confirmed the chemical structures of the as-prepared cationic compounds. The inhibition efficiency increased with the increase the concentration of the as-prepared compounds in the solution. The curves of the potentiodynamic polarization and the plots of EIS techniques show that the performance of all investigated compounds as mixed type. The standard free energy values imply that the three as-prepared compounds show physicochemical adsorption and obey the Langmuir adsorption model. AFM technique observed the reduction in the surface roughness due to the protective film formed on the copper surface. Finally, computational calculations show a great correlation with the experimental results due to the electron-donating effect.
本研究旨在制备三种基于苯并三唑的阳离子表面活性剂，并使用不同的电化学技术（动电位极化、电化学阻抗谱（EIS）和原子力显微镜（AFM））评估它们作为海水中铜电极缓蚀剂的效率。傅里叶变换红外光谱（FTIR）和核磁共振氢谱（H NMR）技术证实了所制备阳离子化合物的化学结构。缓蚀效率随着溶液中所制备化合物浓度的增加而提高。动电位极化曲线和EIS技术的图谱表明，所有研究化合物均表现为混合型。标准自由能值表明，所制备的三种化合物表现出物理化学吸附，且符合朗缪尔吸附模型。AFM技术观察到由于铜表面形成保护膜而导致表面粗糙度降低。最后，由于给电子效应，计算结果与实验结果显示出高度相关性。
