Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (04): 351-355.doi: 10.3866/PKU.WHXB19950413

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Electrodeposition Mechanism of Ni-Mo Alloys from Ammoniacal Citrate Solution

Zeng Yue,Yao Su-Wei,Guo He-Tong   

  1. Department of Chemistry,Hunan Normal Univeristy,Changsha 410006|Department of Applied Chemistry,Tianjin University,Tianjin 300072
  • Received:1994-01-22 Revised:1994-04-12 Published:1995-04-15
  • Contact: Zeng Yue

Abstract:

The electrodeposition mechanism of Ni-Mo alloys from ammoniacal citrate solution was investigated by means of steady-state polarization curves, impedance measurement and XPS analysis. XPS analysis showed the existence of tetravalent molybdenum corresponding to MoO2 on the surface of some deposits. Probably, as an intermediate product, MoO2 was reduced by atomic hydrogen adsorpted on nickel. Electrochemical investigation indicated that [Nicit(NH3)2]-ion is the electro-active species of nickel, though nickel ion exist mainly as [Nicit(NH3)2]- in ammoniacal citrate solution.

Key words: Electrodeposition, Ni-Mo alloy, Mechanism