材料的组织结构对锌电极电化学行为的影响

Organization structure of the zinc and its influence on electrochemical performance

在对锌多晶进行变形、退火等方式处理的基础上,运用金相分析法、X射线衍射法、循环伏安法等方法,分析了金属锌的组织结构与电化学性能的关系。结果表明,锌单晶(002)晶面电极的氧化还原可逆性优于锌单晶(100)晶面电极,锌单晶(100)晶面电极的氧化和还原能力优于锌单晶(002)晶面电极;锌多晶电极的氧化性能和还原性能优于锌单晶电极;晶界、位错等缺陷会提高锌的溶解速度,同时电极表面的位错对还原过程中锌原子的沉积有利;晶粒的增大会减小晶界面积,使得锌电极的晶间腐蚀等局部腐蚀加剧,降低锌电极的耐蚀性,但是晶粒大小对电极电化学性能的影响相对于位错及其它缺陷要小得多。

In this paper, the relationship was studied between the organizational structure and its electrochemical performance for the zinc electrode by metallurgical phase, XRD and cyclic voltammetry. The results show that the reversibility performance of Zn （002） single crystal was superior to Zn （100） and the oxidizing and deoxidi- zing abilities of the Zn （100） single crystal was superior to Zn （002）. The oxidizing and deoxidizing abilities of Zn polycrystal was superior to Zn single crystal. In terms of Zn polycrystal, the dissolution was accelerated and the dislocation was of advantage for electrodeposition during the deoxidization due to a great deal of defect such as grain boundary and dislocation. The area of the grain boundary decreased due to grain growth. As a result, the local corrosion, such as the intercrystalline corrosion, was aggravated and the corrosion resistance of the Zn electrode was reduced. However, the effect of the grains size on the electrochemical performance of the Zn elec- trode was much less than the dislocation and other defects.