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Cobalt and nickel powders of three different compositions: Ni0.8Co0.2,  Ni0.55Co0.45 and Ni0.2Co0.8 were obtained by electrodeposition from an  ammonium chloride-sulphate solution. It was shown that the microstructure and  morphology of the powders depended on the deposition current density as well  as on the bath composition. Amorphous powder of Ni0.8Co0.2 was obtained at  the current density higher than 200 mA cm-2, but nanocrystalline powders  having the same composition were obtained at current densities lower than 200  mAcm-2. The nanocrystalline powders with lower Ni contents (0.55 and 0.2)  obtained at a current density ranging from 40 mA cm-2 to 450 mA cm-2 were  solid solutions of two phases, FCC (β-Ni) and HCP (α-Co) ones. The increase  of the HCP phase in the powder was a result of both the Co content increase  in the powder and decrease of the deposition current density

The phase structure and morphology of electrodeposited nickel-cobalt alloy powders