The effect of molecular structure on the performance of three triazole derivatives namely benzotriazole (BZT), 5-methyl-1H-benzotriazole (5MBZT), and 3-amino-5-methylthio-1H-1,2,4, triazole (3AMT) as corrosion inhibitors for C1020 steel and pure copper in 2% hydrochloric acid (HCl), which simulate descaling process in a typical desalination plant was investigated. Electrochemical characterization such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), linear polarization resistance (LPR) techniques and theoretical simulations were utilized in this study. The electrochemical characterization results showed that the order of inhibition efficiencies for the inhibitors was a function of the type of metal, molecular structure, and immersion time. For instance, for C1020 steel, the order of inhibition efficiency using EIS data was 5MBZT (91.8%) > BZT (78.1%) > 3AMT (24.8%) after 24 h of immersion. On the other hand, for pure copper, the order of inhibition efficiency with the same EIS data was 3AMT (93.0%) > 5MBZT (92.1%) > BZT (90.4%) after 24 h of immersion indicating the role of different metallurgy on corrosion protection. The theoretical results provided molecular level insights on the nature and the active sites of the corrosion inhibiting species as well as the energetics of the adsorption process on steel and copper.

分子结构对苯并三唑(BZT)、5-甲基-1H-苯并三唑(5MBZT)和3-氨基-5-甲硫基-1H-1,2,4,三唑(3AMT)三种三唑衍生物性能的影响作为 C1020 钢和纯铜在 2% 盐酸 (HCl) 中的缓蚀剂，模拟了典型海水淡化厂的除垢过程。本研究利用电化学阻抗谱 (EIS)、动电位极化 (PDP)、线性极化电阻 (LPR) 技术和理论模拟等电化学表征。电化学表征结果表明，抑制剂的抑制效率顺序是金属类型、分子结构和浸泡时间的函数。例如，对于 C1020 钢，浸泡 24 小时后，使用 EIS 数据的抑制效率顺序为 5MBZT (91.8%) > BZT (78.1%) > 3AMT (24.8%)。另一方面，对于纯铜，在相同 EIS 数据下，浸泡 24 h 后缓蚀效率的顺序为 3AMT (93.0%) > 5MBZT (92.1%) > BZT (90.4%)，表明不同冶金对腐蚀的作用保护。理论结果为缓蚀物质的性质和活性位点以及钢和铜吸附过程的能量学提供了分子水平的见解。4%) 浸泡 24 小时后表明不同冶金对腐蚀防护的作用。理论结果为缓蚀物质的性质和活性位点以及钢和铜吸附过程的能量学提供了分子水平的见解。4%) 浸泡 24 小时后表明不同冶金对腐蚀防护的作用。理论结果为缓蚀物质的性质和活性位点以及钢和铜吸附过程的能量学提供了分子水平的见解。