Journal of Applied Electrochemistry, Vol.36, No.3, 333-338, 2006
Induced electrodeposition of tungsten with nickel from acidic citrate electrolyte
Induced electrodeposition of Ni-W alloys was carried out onto steel substrates from acidic citrate baths (pH 4.5) under different conditions of concentration of electrolyte, current density and temperature. Bright and highly adherent Ni-W deposits were successfully obtained with a relatively high cathodic current efficiency CCE (80-85%). The CCE increases greatly with increasing pH and Ni2+ ion content in the bath. The W% in the alloy deposits is in the range of 4-20 wt% depending on the operating condition. The W content in the deposit was found to increase with an increase in Ni2+ ion content, pH and temperature. The surface morphology was examined by scanning electron microscopy while the structure of the alloy was examined by X-ray diffraction analysis.