Cl^-对Zn-Co(Fe)合金共沉积中Zn转移电流密度的影响  

Effect of Cl^- on the Transition Current Density of Zn during the Electrodeposition Zn-Co, Zn-Fe Alloys

作　　者：印仁和[1] 方正华[1] 张利[1] 徐红斌[1] 

机构地区：[1]上海大学理学院化学系,上海200436

出　　处：《化学学报》2002年第3期404-407,共4页Acta Chimica Sinica

基　　金：厦门大学固体表面物理化学国家重点实验室资助项目

摘　　要：在氯化物电解液中的Zn Co ,Zn Fe合金共沉积 ,存在着由正常共沉积转变成异常共沉积的Zn的转移电流密度 ,该值随着Cl-浓度的增加而增加 .当Cl-浓度高达 4mol·dm-3 以上时 ,Zn Fe合金共沉积中已不存在Zn的转移电流密度 ,为单一正常共沉积 .这是因为Cl-降低了Co ,特别是Fe的析出过电位之故 .For co-deposition of Zn-Co or Zn-Fe alloys in chloride baths it was found that the transition current density of Zn varied with the deposition process from normal co-deposition to anomalous co-deposition. The value of the transition current density increases with the increasing of Cl- concentration. However, when Cl- concentration exceeds 4 mol(.)dm(-3), the co-deposition process becomes normal type and the transition current density of Zn disappears. It can he attributed to the existence of Cl-, which decreases the evolution overpotential of Co and Fe metal, especially for Fe metal.

关 键 词：转移电流密度 异常共沉积 锌钴合金 合金镀层 氯化物 电解液 锌铁合金 

分 类 号：TQ153[化学工程—电化学工业]