Abstract
Chemical plating cost will be reduced, if the life of bath becomes so long that the bath can be used repeatedly after purification. The authors have been investigating the life and reproduction of chemical plating bath in commercial point of view. In this paper, the relations between the volume of plating solution and plated area, as well as the particular concerning the reproduction of the plating solution, are reported as follows:
1) It is necessary for long life of plating bath that the volume of plating solution is increased in comparison with plated area.
2) It is, however, desirable that the ratio of volume of solution and plating area (V/A) is less than ten.
3) In reproducing the plating solution detrimental phosphorous ion, should be removed, as well as nickel and hypophosphorous ion should be supplied, and value of pH controlled.
4) It is possible to make the life of plating bath long and to prevent the precipitation of nickel salts by the addition of organic acid such as propionic acid or lactic acid.
