METHOD OF ELECTRODEPOSITING NICKEL-COBALT ALLOY

摘要

The present invention provides a method to fabricate Ni-Co alloy where in this process, electrodeposition of Ni-Co alloy is conducted in a non-aqueous electroplating bath consisting of a mixture of ionic liquid, 1-ethyl-3-methyllimidazolium chloride (EMIC) [20] and organic compound, ethylene glycol (EG) [22] as the solvent together with Ni and Co ions, with the application of a magnetic field parallel to the cathode [24] surface. With application of an external permanent magnetic field parallel to the cathode [24] surface, the rate of transport of Ni and Co ions to the cathode surface is increased, therefore increasing the current density of electrodeposition of Ni-Co alloys. As the magnetic force is stronger for the Co ion compared to Ni ion, there will be an increased transport of Co ion compared to the Ni ion to the cathode surface. This result in higher Co content in the Ni-Co alloy compared to Ni, even when the bath composition ratio of Co is lower than the bath composition of Ni.