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topic 59455

Plating onto an assembly of aluminum and steel



November 7, 2013

Q. Hi,

I have a customer that needs an aluminum tray with steel clench nuts and steel studs attached zinc nickel plated. Does have any experience on how to activate these 2 metals together for plating?

Bernard N
- USA


November 2013

A. Hi. I haven't done it, and electroless nickel is expensive if the "tray" is large, but mild cleaning, minimal desmut, zincate (single, not double -- you don't want to put steel into nitric acid), and alkaline electroless nickel strike might work. You can follow the EN with zinc-nickel plating.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


November 8, 2013

A. Clean, Rinse, Deox in 8 oz/gal Ferric Sulfate room temp, rinse, hang in the ALKALINE zinc nickel tank with the current OFF, after 45 seconds slowly turn on and up the rectifier, spend 15 minutes getting up to the recommended current density. The alkaline zinc-nickel will act as the "zincate" and cover the aluminum with a thin immersion, then you can start the electroplating to thickness.

robert probert



Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
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November 2013

thumbs up signVery interesting, Robert. Thanks!

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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