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Coupling of chemical electrochemical and theoretical approach to study the corrosion inhibition of mild steel by new quinoxaline compounds in 1 M HCl

机译:化学电化学和理论方法的结合用于研究新型喹喔啉化合物在1 M HCl中对低碳钢的腐蚀抑制作用

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摘要

The corrosion inhibition displays of two quinoxaline derivatives, on the corrosion of M-steel (M-steel) in 1 M HCl was studied by gravimetric, electrochemical, scanning electron microscopy (SEM), functional density theory (DFT) and molecular dynamic simulation (MD). The inhibitory efficacy increases with decreasing temperature and increases with inhibitor concentration and reached to 96 % (NSQN) and 92 % (CSQN) at 303 K and the optimum concentration (1×10-3 M). Ultraviolet–visible (UV–vis) spectroscopic analyses confirmed the presence of chemical interactions between the inhibitors and MS surface. The adsorption of NSQN & CSQN on the metallic surface obeys the Langmuir isotherm. A potentiodynamic polarization study confirmed that the inhibitors are of mixed-kind inhibitors. Theoretical computation (DFT) and molecular dynamics simulation (MD) are utilized to understand the mechanism of inhibition.
机译:通过重量,电化学,扫描电子显微镜(SEM),功能密度理论(DFT)和分子动力学模拟研究了两种喹喔啉衍生物在1 M HCl中对M钢(M钢)的腐蚀抑制作用。 MD)。抑制功效随温度降低而增加,并随抑制剂浓度而增加,在303 K和最佳浓度(1×10-3 M)时达到96%(NSQN)和92%(CSQN)。紫外可见(UV-vis)光谱分析证实了抑制剂与MS表面之间存在化学相互作用。 NSQN和CSQN在金属表面的吸附遵循Langmuir等温线。电位动力学极化研究证实,这些抑制剂是混合抑制剂。理论计算(DFT)和分子动力学模拟(MD)用于了解抑制的机理。

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