PHYSICAL-PROPERTIES AND STRUCTURE OF ELECTRODEPOSITED NICKEL FROM SULFAMATE-CHLORIDE-ETHYLENE GLYCOL BATH

Nickel was electrodeposited using nickel sulphamate and nickel chlorid e in ethylene glycol under different plating conditions. Bright and ad herent nickel was obtained at a current density of 100 A m(-2) at 40 d egrees C using a mixed electrolyte in ethylene glycol. The effect of c urrent density and bath temperature on the cathode current efficiency, microhardness, and structure of the deposits obtained has been studie d. The microhardness of the deposits declined with increasing annealin g temperature. Studies using transmission electron microscopy and X-ra y diffraction revealed a preferred orientation to some extent at diffe rent current densities. The results have been explained taking into ac count the hydrogen content in the deposits. The influence of interrupt ed direct current has also been investigated.