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"Plating out / dummying a Nickel Bath"
When plating out a nickel solution to remove metallic contaminants is it necessary to adjust the pH to any specific value to favour the deposition of zinc or copper? I have been told that pH is relevant but have not found any written references on this subject.Tony van der Spuy
- Cape Town, South Africa
When dummying to remove copper and zinc, a pH towards the high side, say 4.5 -4.8 will help a bit.
Jeffrey Holmes, CEF
Spartanburg, South Carolina
First of two simultaneous responses -- 2005
Ofcourse pH is relevant. At pH 2.7 to 3.5, ions of contaminants of metals like zinc and copper at low voltage/amperage (1V/0.2 amp/dm2) move faster than nickel ion. Hence, dummying at lower pH and lower voltage will give faster effect and remove the impurities of nickel bath.
plating process supplier - Mumbai, India
Second of two simultaneous responses -- 2005
The Ph 3,5-4,5 and controll the Ph when you dummying the solution because the Ph will enhancementin the nickel solution under the time you dummying.
4th Generation Surface Engineering
Consultant - Arvika,
To remove copper and zinc from nickel plating solution current density of dummy electrolysis is more important. Because of decomposition potential, copper and zinc has the tendency to deposit at 0.1 to 0.2 A/dm2.
- Kitchener, Ontario, Canada