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How to palladium plate in lieu of rhodium to tarnish-proof silver

2004

I require to produce a protective coating on silver products that we make, protecting them from sulfide blackening in a volcanic environment (Rotorua).

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From the Pt group metals I would prefer to plate in a bright palladium which is more ductile in post plate forming than rhodium plate.

Using palladium ammonium nitrate, I would like to know what brightener I should use in the plating bath and any other relevant information as our current palladium plate is of a matte finish at various temperatures. The bath palladium concentration of about 5 grams a litre. Next step is to try gas agitation during plating. Rather than waste a lot of time trying different methods it would be good to get a quick answer. Was thinking of trying the brighteners used in nickel plating?

If possible text references would be nice.

Thank you.

Regards

Kevin Ansin
Precious metal refiner and glass bead producer - DUNEDIN, Otago, New Zealand

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