Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (3): 404-407. Previous Articles     Next Articles

Original Articles

Cl~-对Zn-Co(Fe)合金共沉积中Zn转移电流密度的影响

印仁和;方正华;张利;徐红斌   

  1. 上海大学理学院化学系.上海(200436)
  • 出版日期:2002-03-15 发布日期:2002-03-15

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

Yin Renhe;Fang Zhenghua;Zhang Li;Xu Hongbin   

  1. Department of Chemistry, Shanghai University.Shanghai(200436)
  • Online:2002-03-15 Published:2002-03-15

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 be attributed to the existence of Cl~-, which decreases the evolution overpotential of Co and Fe metal, especially for Fe metal.

Key words: ZINC ALLOYS, COBALT ALLOYS, CURRENT DENSITY, SEDIMENTATION

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