材料期刊网

用弱极化曲线拟合和交流阻抗技术测定了铁在含或不含Cl~-的癸胺(DA),二戊胺(DPA)和十二烷基胺(DDA)酸性除氧溶液中腐蚀速度和界面电容。计算了有机胺在铁表面的吸附覆盖度随浓度的变化。结果表明,无论溶液中是否存在Cl~-,有机胺在两个不同的吸附区间内分别遵循Temkin等温吸附和Frumkin等温吸附。讨论了有机胺吸附对界面电容的影响,提出了一种酸性水溶液中有机胺分子在铁表面上吸附的模型,据此对有机胺的缓蚀作用及与Cl~-的协同效应等进行了理论解释。

Corrosion rate and interface capacity of iron in acidic perchloride solutions cantaining decylamine(DA), dipentylamine(DPA) and dodecylamine(DDA) with or without chloride ion have been measured by curve-fitting method of weak polarization data and AC impedance technique. The degree of coverage of organic amines on Fe surface has been calculated as a function of bulk concentration of amines. It has been found that organic amines are adsorbed from the solutions both with and without Cl- on the Fe surface according to Temkin isotherm and Frumkin isotherm in two different regions. The effect of adsorbed organic amine molecules on the interface capacity between electrode and solution is discussed, and a model for discribing the adsorption of organic amine molecules from acidic solutions on the Fe surface is proposed, with which the experimental results of the inhibition of organic amines and the synergistic effect of Cl- ion with them are interpreted.