Abstract
SUMMARYElectrodeposition of Ni-W coatings on various substrates is of interest to achieve hard, wear—and corrosion-resistant coatings. Deposition may occur from acidic as well as from alkaline tungsten containing electrolytes. The corrosion-resistance of such layers is high. Even boiling concentrated hydrogen chloride solution needs many hours to dissolve Ni-W coatings detached from the base metal. As tungsten cannot be electrodeposited from aqueous solutions co-deposition of W oxides into the Ni layer is proposed. Dissolution of different detached Ni-W layers in concentrated boiling HCl under flowing N2 never showed elementary W as residue; only yellow WO3 along with minute amounts of tungsten blue precipitated. The aim of this investigation was to clarify the bonding-state of W in the electrodeposited Ni-W coatings.
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