Abstract
Effects of composition and pH of electroless cobalt plating bath on structure of cobalt plating films were studied mainly by X-ray diffraction method. Cobalt deposits of electroless plating had polycrystalline structure of α-cobalt with close packed hexagonal lattices, and the grain size and orientation of the crystals greatly depended upon the composition and pH of the plating bath. Deposits of finer grain size were obtained, when the growth of crystals was inhibited by adsorbed hypophosphite ions or reduced phosphorus atoms adsorbed on the surface. As the formation and diffusion velocities of cobalt atoms on the crystal plane controlled preferred orientation of cobalt crystals, the deposits with fiber structure were produced.
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