Influence of Process Parameters on Pulse Electroforming of Nickel-Rich Nickel-Cobalt Alloys from Sulfamate Electrolyte

Abstract

Nickel-cobalt alloys have a wide range of industrial applications because of high strength, good corrosion resistance, heat-conductive, etc. As an example, they are used in the electroforming of moulds for die-casting and plastics and in electrotyping. In this paper, experiments on pulse electroforming of nickel-rich nickel-cobalt alloys were studied on SUS304 substrates from sulfamate electrolyte with different average current density, pulse frequency, duty cycle and different bath temperature. It is clearly observed in the nickel-rich deposits that effect of cobalt content gradually increases as the Co2+/Ni2+ concentration ratio and duty cycle increasing; The Co content seems to hardly change when pulse frequency changed from 500 Hz to 1000 Hz; The Co content decreases as current density increasing. High Co content and smooth surface topography can be obtained by reducing current density, increasing bath temperature and pulse duty cycle.