Abstract

The effects of two expired antibacterial drugs, amoxicillin (Amo) cefuroxime (Cef), on the corrosion behavior of Sabic iron in 1.0 M HCl solution were examined using weight loss, galvanostatic polarization (GAP), potentiodynamic anodic polarization, and electrochemical impedance spectroscopy techniques. The outcomes showed that the inhibition efficiency increased with increasing concentrations of Amo and Cef and decreased with temperature. The activity of inhibition of these compounds was elucidated by adsorption on Sabic iron surfaces. The adsorption process obeyed the Langmuir isotherm. The activation and adsorption thermodynamic parameters have been determined and clarified. GAP studies indicated that expired Amo and Cef served as mixed inhibitors. The impedance data showed capacitive loop which indicates that charge transfer governs corrosion reactions. Expired Amo and Cef drugs are good pitting inhibitors by positively shifting the pitting potential. There is a complete agreement between the inhibition efficacies obtained from the different measurements

摘要

使用失重、恒电流极化 (GAP)、动电位阳极极化和电化学阻抗谱技术研究了两种过期的抗菌药物阿莫西林 (Amo) 头孢呋辛 (Cef) 对 Sabic 铁在 1.0 M HCl 溶液中的腐蚀行为的影响. 结果表明，抑制效率随着Amo和Cef浓度的增加而增加，随着温度的升高而降低。通过在 Sabic 铁表面上的吸附阐明了这些化合物的抑制活性。吸附过程服从朗缪尔等温线。活化和吸附热力学参数已经确定和阐明。GAP 研究表明，过期的 Amo 和 Cef 作为混合抑制剂。阻抗数据显示电容回路，这表明电荷转移控制腐蚀反应。过期的 Amo 和 Cef 药物通过正向改变点蚀电位是良好的点蚀抑制剂。从不同测量中获得的抑制效果完全一致