COBALT ELECTROPLATING FROM AQUEOUS-ELECTROLYTES OF DIFFERENT ANIONIC SPECIES

Cobalt electroplating from various baths with nearly the same chemical constituents except for the anion was studied. The baths were based m ainly on acidic aqueous solutions of cobalt sulphate, cobalt chloride, cobalt bromide and cobalt acetate. The study revealed that the nature of the anion influenced to different extents each of the cathodic pol arization, current efficiency, throwing power and throwing index of th e cobalt electroplating process from the examined baths. In addition, the surface morphology and microhardness of the cobalt electroplate we re influenced to some extent by the employed anion.