某些含氮杂环化合物对20^#钢的缓蚀作用研究

用失重法、交流阻抗和极化曲线法研究了1mol/L HCl溶液中吡啶、喹啉及其衍生物对20~#钢的缓蚀作用。根据吡啶和喹啉在20~#钢表面上的复盖度与浓度及温度的关系,探讨了它们在20~#钢上的吸附行为,并提出了吸附模式。结果表明,吡啶和喹啉的吸附遵循Flory-Huggins吸附等温式。文中还估算了吡啶和喹啉吸附的热力学参数。

A Study on Inhibition of Some Hetcrocyclic Compounds Containing Nitrogen for Corrosion of Mild Steel

It is investigated that the inhibition of pyridine, quinoline and their derivatives for the corrosion of mild steel in 1 mol/L HC1 solution by weight-loss, impedance and polarization techniques. It is found that these compounds can inhibit both cathodic and anodic processes of mild steel. The corrosion potential shifts to less noble direction. The inhibition efficiency obtained by weight-loss is in good agreement with that obtained by impedance method. According to the relationship of the degree of coverage of pyridine or quinoline to its bulk concentration and system temperature, the adsorption of both inhibitors on mild steel follows Flory-Huggins isotherm. Thus, the thermodynamic parameters of the adsorption of pyridine and quinoline are evaluated from the adsorption isotherm. A possible adsorption modle of pyridine, quinoline and their derivatives on the surface of mild steel is also proposed.