On the Nature of Burned Anodic Coatings

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Abstract
Nickel‐cobalt alloys were deposited from chloride solutions buffered with boric acid. The effects of solution temperature, solution concentration, solution :metal ratios, solution pH, cathode rotation, cathode current density, addition agents and superimposed alternating current, on the nickel‐cobalt deposit, were studied. Many of the deposits plated were bright or semi‐bright. A satisfactory bath was operated at a concentration of 110 g./L nickel chloride, 5.5 g./L cobalt chloride and 15 g./L boric acid. The solution pH was maintained between 1.5 to 2.0 and the bath, operated at room temperature, gave satisfactory deposits at cathode current densities of 15 to 50 amp./sq. ft. (1.6 to 5.4 amp./dm.2).

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