Plating Electroless Nickel onto a Silver Substrate
Can anybody tell me if electroless nickel can be plated on silver substrate? Is any pre-treatment necessary to condition silver before immersing the sample in electroless nickel/phosphorous solution?
Thanks a lot for your attention.
Laboratory of Physical Sciences - College Park, MD
A normal prep cycle for silver will do. EN will not plate, without help, onto silver. A palladium immersion coat will work. More practical is a nickel strike and rapidly rinse and get into the EN, or put the prepped part into the EN and make the part cathodic for a few seconds with some type of anode in the tank that you remove after the EN kicks off.
Lowenheim's Modern Electroplating has a few sentences on it.
Most other references have nothing.
Not many people would have a need for EN over silver.James Watts
- Navarre, Florida
Acidic hypo EN does not work on Ag, but ammonia hypo EN does. Substrate surface should be polished, or degreased and soaked in a thiourea-type lightener. Rinse with DI water and plate immediately.Alex Kozlov
- New Jersey
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