电场作用下金属锌在薄液膜下的腐蚀电化学研究

Corrosion Behavior of Zinc Covered with Thin Electrolyte Layers under External Electric Field

采用薄液膜实验装置,测量了外加直流电场作用下锌在薄液膜体系中的腐蚀电位、阴极极化电流以及阴极极化曲线等.研究了外加直流电场对锌在薄液膜下腐蚀行为的影响.结果表明,外电场的作用可以使锌电极的腐蚀电位负移,也可以使锌电极在阴极极化条件下的阴极电流增加.分析结果表明,外电场与薄液膜体系中锌电极电化学过程中的相关因素发生了协同作用,改变了锌电极的阴极过程.

The corrosion behavior of zinc covered with thin electrolyte layers （TELs） under an application of external electric field was investigated by performing corrosion potential and cathodic polarization current measurements. The results showed that the Eand ic values first increased and then decreased with the increase of electrolyte layer thickness. Pure zinc exhibited the maxi- mum corrosion potential as the TELs increased to 400 Ixm under the controls of cathodic process and corrosion products. The appli- cation of external electric field resulted in either a negative shift in corrosion potential of zinc or an increase of cathodic current. The effect of external electric field on the electrode process was discussed in this paper.