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Ni or Ni-Zn alloy or Ni-Zn-Co alloy plated manner
Ni or Ni-Zn alloy or Ni-Zn-Co alloy plated manner
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机译:镍或镍锌合金或镍锌钴合金的电镀方式
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摘要
PURPOSE:To control the concn. of the plating solution for a long time and to enable stable plating by removing the increment of the hydrogen ion concn. from the plating bath by use of a diffusion dialysis tank. CONSTITUTION:In the process of plating, the hydrogen ion concn. in the plating tank B increases. When the initial concn. of sulfuric acid in the cathode room (b) of the electrolysis tank A is set low, the hydrogen ion concn. in the dialysis tank C differs between two rooms separated by an anion-exchange membrane. This causes diffusion of sulfuric acid to the room of lower concn. as shown by an arrow D in the figure. Thereby, the desulferized soln. returns to the plating tank B as shown by an arrow E, while the soln. into which sulfuric acid diffuses returns to the cathode room (b) of the electrolysis tank A as shown by an arrow F. Since the anion-exchange membrane 4 is used in the dialysis tank C in this process, Ni, Zn or Co ions hardly move to the room of lower concn.
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