作　　者： ; ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《金属学报》 2011年第8期1055-1060,共6页

摘　　要： 用电沉积的方法在Ni基体上制得了Zn-In合金,采用ICP,SEM和EDS研究了电镀Zn-In合金的组织和成分,采用LSV,CV和EIS等方法研究了不同镀时下电镀Zn-In合金在碱性溶液中的电化学行为.结果表明,沉积时间越长,合金中In的含量越高;与镀时为20和30 min相比,10 min为较佳镀时,在此镀时下,Ni基体表面能形成均匀平整的Zn-In合金,延长镀时,会因为局部In颗粒生长过快使Zn-In合金均匀性变差;Zn-In合金中的In能提高Zn电极的析氢过电位,增加Zn阳极溶解电阻,可有效抑制Zn自腐蚀共轭反应的两支;当Zn活化溶解时,In的存在还提供了骨架的作用,为OH^-通过合金表面跟内层的Zn反应提供了通道,使得Zn的致钝电位发生正移,活化电位区间也得到拓宽,Zn的钝化得到延缓,放电深度得到加强,放电容量得到提高;Zn的活化溶解产物易于在In电极表面还原,Zn的充放电性能得到改善. Zinc-indium alloy electrodes based on nickel substrate were prepared by a simple electroplating technique.The content of indium element in zinc-indium alloy became higher with increase in electroplating time.The effects of indium in zinc-indium alloy coating with different electroplating times on the electrochemical behaviors of zinc in alkaline solutions were investigated by inductively coupled ICP,SEM,EDS,LPS,CV and EIS.The results showed that ten minutes was the best electroplating time among the investigated electroplating times.At the plating time often minutes, uniform and smooth Zn-In alloy coating could be formed on the surface of nickel substrate.However, as electroplating time went on the uniformity and homogeneity of Zn-In alloy coating became much poorer because of the formation of the local large indium particles resulting from the priority growth. The electrochemical measurements showed that indium in zinc-indium alloy coating could enhance the overpotential of hydrogen evolution and the anodic dissolution resistance of zinc.This means that indium could inhibit effectively the conjugated reaction of zinc corrosion in alkaline electrolyte.Besides, indium could provide the skeleton support when zinc-indium alloy dissolved in alkaline solution.The skeleton support offered the path for OH^- species passing through the surface layer of zinc-indium alloy to react with zinc in alloy inner.These effects made the passivation potential of zinc in alkaline solution shifted in positive direction.Indium could also broaden the potential region for the active dissolution of zinc and postpone the passivation of zinc.The depth of discharge of zinc in alkaline electrolyte could be improved in the presence of indium in zinc-indium alloy coating with appropriate content.Accordingly,the discharge capacity of zinc in alkaline electrolyte could be raised to a certain degree.The indium with appropriate contents in Zn-In alloy coating could favor the reduction of zinc oxide products.The charge-discharge performance of zinc

关 键 词： 电镀 合金 碱性溶液 电化学行为

领　　域： [理学] [理学]