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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 of iron in acidic deoxygenated solution of decylamine (DA), diamylamine (DPA) and dodecylamine (DDA) with or without Cl ~ - was determined by means of weakly polarized curve fitting and AC impedance techniques Speed and interface capacitance. The adsorption coverage of organic amine on the iron surface was calculated as a function of concentration. The results show that, regardless of the presence or absence of Cl ~ - in the solution, the organic amine follows the Temkin isothermal adsorption and the Frumkin isothermal adsorption in two different adsorption intervals, respectively. The effect of organic amine adsorption on the interfacial capacitance was discussed. A model of organic amine molecules adsorbed on the iron surface in acidic aqueous solution was proposed. Based on this, the corrosion inhibition of organic amines and the synergistic effect with Cl ~ - Explanation.