Electrodeposition of Cobalt-Tungsten Alloys from an Acid Plating Bath

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Abstract
Cobalt‐tungsten alloys have been electrodeposited from a cobalttungsten plating bath which was prepared by adding sodium tungstate to a modified Kalmus‐type cobalt plating bath. Changes in alloy composition and cathode current efficiencies were studied at various current densities, bath pH's and bath temperatures. It was found that the amount of tungsten in the cathode deposit was greatest when the tungsten content of the bath was relatively high and when the electrolysis was carried out at the lower current density range with the higher bath pH and temperature. The tungsten content of the deposits varied from 1% to 16%. Deposits varied in appearance from dull, streaked and non‐metallic to bright and metallic, depending on conditions. The cathode efficiency was best at the higher current densities, particularly at the higher bath pH; range. A typical satisfactory bath contained 1 to 2 g./L tungsten with electrolysis carried out at a bath pH of 3.5 to 4.5, a bath temperature of 65° to 70°C and a current density of 3 to 4 amp./dm.2

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