ABSTRACT

The anticorrosion potency of Sabic mild steel (MS) in 0.5 M H₂SO₄ solution was enhanced by three synthetic non-ionic surfactants (NI Surf.) containing pyridine and pyrimidine derivatives. These compounds are safe, environmentally friendly, and harmless to human health. Chemical and electrochemical measurements were used to compute the corrosion parameters. The anticorrosion efficacy increases with increasing the concentration of NI Surf. and with lowering temperature, surface and interfacial tension, and critical micelle concentration. The effectiveness of anticorrosion is interpreted due to the spontaneous horizontal adsorption on the surface of MS by the existence of some active centers that facilitate the adsorption. The adsorption process obeys Temkin isotherm. Potentiodynamic polarization elucidated that the synthetic NI Surf. acted as mixed-type inhibitors. Some surface properties were determined and confirm the anticorrosive effect of these molecules. Quantum chemical parameters as reactivity descriptors were carried out. It should be noted that the results obtained from computational calculations of the specifications are in full agreement with the experimental observations. There is good compatibility between the anticorrosion efficiency obtained from various techniques and surface properties and quantum chemical calculation.

摘要

Sabic低碳钢（MS）在0.5 MH ₂ SO _4中的防腐效能含吡啶和嘧啶衍生物的三种合成非离子表面活性剂（NI Surf。）增强了溶液的稳定性。这些化合物安全，环保且对人体健康无害。化学和电化学测量被用来计算腐蚀参数。耐腐蚀性随NI Surf浓度的增加而增加。并降低温度，表面和界面张力以及临界胶束浓度。由于存在一些促进吸附的活性中心，导致MS表面自发水平吸附，从而解释了防腐的有效性。吸附过程遵循Temkin等温线。电位动力学极化阐明了合成的NI Surf。充当混合型抑制剂。确定了一些表面性质，并证实了这些分子的防腐作用。进行了量子化学参数作为反应性描述子。应该注意的是，从规范的计算计算中获得的结果与实验观察结果完全一致。从各种技术获得的防腐效率，表面性能与量子化学计算之间具有良好的兼容性。