ニッケルメッキの限界電流密度について

高速電着に関する研究 (第1報)

抄録

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/l
and boric acid 30g/l
Electrolyte temperature: 20-60°C
Interval between electrodes: 1mm
Flow 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:
i_l=1.7×10⁶nFCD²U1/2/1-α
where U=Flow speed of electrolyte
D: Diffusion coefficient
F: Faraday constant
C: Concentration of nickel sulfate
α: Transport number
i_l: Limiting current density
The above equation corresponded well with the results of experiments at Reinolds number of less than 5000. However, the measured values of i_l were higher than those calculated from the above equation at speeds in the range of 0-1 or beyond 5m/sec.