SAM4CH - 5-7-2007 at 13:19
How can I formation alloy with any percent of metals like nickel/cobalt, copper/zinc by electrolysis!!
chromium - 5-7-2007 at 13:57
As far as i know there is no general rule and working recipies are largely based on trial and error. Good electroplating manuals usally contain
information how to plate some alloys but you will not find data for any given precentage.
dedalus - 6-7-2007 at 03:39
There's a well established cyanide based chemistry for plating brass - the Cu/Zn ratio can be adjusted, but it's not an easy or straightforward
matter. The "free" cyanide content and the pH, more than the Cu/Zn ratio in the solution, affect the ratio that's deposited. There are also bronze
(Cu/Sn) plating baths. Those I know very little about.
I'm getting into Zn/Ni plating, lately. This is a very promising technology for replacing electroplated cadmium. I talk about it in more detail on my
page, at http://www.dedalusenviro.com/rohs.html
if you're interested. Zn and Cd coatings have the property of providing cathodic protection to iron, and Zn/Ni coating share this, until the Ni
content gets past abou 15%. Then, the steel beneath the coating becomes the anode...and the corrosion resistance of the object falls sharply.
Alloy electroplating
ciscosdad - 11-7-2007 at 17:32
As far as I remember, the composition and concentration of the electrolyte is critical. The idea is to have the discharge potentials of the required
metal ions at specific levels. For example, to plate a 50:50 alloy, the potentials will have to be substantially the same. The required solutions may
possibly be figured out in advance, but from my limited recollection, you will have to experiment to establish what is needed for your specific
circumstances.. Tenmperature, pH, anode/cathode material, bath impurities and current density all have an effect.
Brass plating baths are cyanide based.
A patent search may unearth some clues. If I can find anything specific I'll get back to you. I seem to recall something in an old encyclopedia of
formulas I have.
Good luck.
chemist1066 - 21-8-2007 at 11:19
They do plate alloys: SnPb (solder), NiZn, also they plate alloys with very minor components ZnCo, ZnFe. Brass has also been plated. Gold plating has
a small amount of Co in it for hardness also. There are rules, basically, the deposition potential ofthe complex has to be somewhat close for both
elements.