Electrodeposition of noncrystalline cobalt–tungsten alloys from citrate electrolytes
Ibrahim, Magdy; S.S. ABD EL REHIM; S.O. MOUSSA;
Abstract
Induced electrodeposition of Co–W alloys onto steel substrates from acid citrate baths has been investigated. The
effects of some plating parameters, such as current density, pH and temperature on the potentiodynamic cathodic
polarization curves, cathodic current efficiency of the alloy and the percentage tungsten in the alloy were studied.
Highly adherent and compact Co–W alloys codeposited from citrate baths containing up to 28 mass % tungsten
were obtained. The percentage W (w/w) in the alloy increases with increasing pH, bath temperature and Co2+ ion
concentration. On the other hand, the percentage W in the alloy decreases with increasing current density. Anodic
linear stripping voltammetry (ALSV) indicated that the alloy might consist of one phase solid solution. These alloys
were determined to be noncrystalline by X-ray diffraction analysis.
effects of some plating parameters, such as current density, pH and temperature on the potentiodynamic cathodic
polarization curves, cathodic current efficiency of the alloy and the percentage tungsten in the alloy were studied.
Highly adherent and compact Co–W alloys codeposited from citrate baths containing up to 28 mass % tungsten
were obtained. The percentage W (w/w) in the alloy increases with increasing pH, bath temperature and Co2+ ion
concentration. On the other hand, the percentage W in the alloy decreases with increasing current density. Anodic
linear stripping voltammetry (ALSV) indicated that the alloy might consist of one phase solid solution. These alloys
were determined to be noncrystalline by X-ray diffraction analysis.
Other data
Title | Electrodeposition of noncrystalline cobalt–tungsten alloys from citrate electrolytes | Authors | Ibrahim, Magdy ; S.S. ABD EL REHIM ; S.O. MOUSSA | Keywords | citrate baths, cobalt–tungsten, codeposition, non-crystalline alloy, potentiodynamic | Issue Date | 2003 | Publisher | Springer | Journal | Journal of Applied Electrochemistry |
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