Limiting Current Density in Nickel Plating

This paper describes the studies on the limiting current density in nickel plating.The experiments were carried out under the following conditions.Composition of electrolyte: nickel sulfate 300g/land boric acid 30g/lElectrolyte temperature: 20-60°CInterval between electrodes: 1mmFlow speed of electrolyte: 0-10m/sec.As the results of experiments, it was found that the limiting current density in nickel plating can be expressed by the following equation:il=1.7×106nFCD2U1/2/1-αwhere U=Flow speed of electrolyteD: Diffusion coefficientF: Faraday constantC: Concentration of nickel sulfateα: Transport numberil: Limiting current densityThe above equation corresponded well with the results of experiments at Reinolds number of less than 5000. However, the measured values of il were higher than those calculated from the above equation at speeds in the range of 0-1 or beyond 5m/sec.