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利用薄液膜实验装置,采用阴极极化曲线、电化学阻抗谱研究了外加直流电场对金属Zn在薄液膜下的腐蚀行为影响。结果表明,外电场使阴极极化曲线中氧还原峰峰电位负移,峰电流增加,电极过程的荷移电阻降低;外电场作用下,使得液膜中存在电场,促进了溶解氧水合基团的传质过程,使氧的还原过程增强。同时外电场的存在使得电极/液膜界面的电荷密度增加,使电极电位负移,促进了阴极还原过程的进行。
The effect of applied direct current (DC) electric field on the corrosion behavior of metal Zn under a thin liquid film was studied by using thin-film experimental apparatus and cathodic polarization curve and electrochemical impedance spectroscopy. The results show that the external electric field negatively shifts the peak potential of the oxygen reduction peak in the cathode polarization curve, and the peak current increases, and the charge transfer resistance of the electrode process decreases. Under the external electric field, an electric field exists in the liquid film and promotes the dissolution of hydrated oxygen groups Mass transfer process, the oxygen reduction process is enhanced. At the same time, the presence of external electric field increases the charge density at the electrode / liquid membrane interface, negatively shifts the potential of the electrode, and promotes the cathodic reduction process.