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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
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
