Effects of additives on zinc electrodeposition from alkaline zincate solution  

添加剂对碱性锌酸盐溶液锌电沉积的影响（英文）

作　　者：Liang YUAN Zhi-ying DING Shi-jun LIU Wei-fa SHU Ya-ning HE 袁亮;丁治英;刘士军;舒伟发;何亚宁(中南大学化学与化工学院,长沙410083;中国航天科技集团8511研究所,南京210017)

机构地区：[1]School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China [2]8511 Research Institute of China Aerospace Science & Industry Group, Nanjing 210017, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第7期1656-1664,共9页中国有色金属学报（英文版）

基　　金：Project(2014CB643401)supported by the National Basic Research Program of China;Projects(51134007,51404299)supported by the National Natural Science Foundation of China

摘　　要：The effects of additives on the surface and cross-sectional morphologies of zinc deposits on iron substrate from alkalinezincate solution were characterized by scanning electron microscope(SEM).The cathodic reaction mechanisms under variousconcentrations of additives were investigated using cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)techniques.It is found that with increasing the additive A content in the bath solution,the nucleation overpotential(NOP)value isobviously increased and the inhibition effect is strengthened.This may be mainly due to the adsorption of additive A on the cathodicelectrode surface,which can cover the active sites and block the discharge reduction.The results of EIS analysis indicate that therate-determining step of zinc electrodeposition process is changed from mixed control step into electrochemical reduction step in thepresence of additive A.However,any quantity of additive B has little effect on the NOP value and the inhibition effect is not obvious.Furthermore,addition of additive A and additive B at the same time displays the strongest inhibition effect and shows a strongsynergism because of their co-adsorption on the cathodic electrode surface.采用扫描电镜表征添加剂对碱性锌酸盐溶液锌电沉积层表面和截面形貌的影响。运用循环伏安法和交流阻抗技术研究不同浓度添加剂在锌电沉积过程中的作用机理。研究结果表明,随着添加剂A浓度的增加,锌的形核过电位增大,对锌还原的抑制作用增强。这是由于添加剂A在阴极表面的吸附作用覆盖了阴极表面活性位点,并阻碍了阴极放电造成的。交流阻抗谱分析表明,在添加剂A存在的情况下,锌电沉积的控制步骤由扩散控制变为混合控制。添加剂B对锌的形核过电位值的影响较小,抑制效果不明显,但同时加入两种添加剂时,在电极表面的吸附作用更加显著,对锌电沉积的抑制作用最大,两者表现出明显的协同作用。

关 键 词：ELECTRODEPOSITION ZINC ADDITIVES alkaline zincate solution morphology 

分 类 号：TQ153.15[化学工程—电化学工业]