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How to properly activate white bronze plating?

October 23, 2019

Q. Dear All,

I'm plating white bronze as an underlayer for gold plating.

White bronze composition is ~ 55% Cu / 30% Sn / 15% Zn.

Sometimes, I have bad bonding between white bronze and gold, probably due to some variations of the composition of white bronze and too high content of tin.

I'm used to activating white bronze with NaHSO4 (60 g/L) with some fluoride.

What would be the best activator for white bronze alloy?

Best regards.


David Icardo
- Italy

October 24, 2019

A. Use the sodium bisulfate (or 5% sulfuric acid) without the fluoride. You do not need a fluoride with that alloy, and be sure to use a gold strike.

robert probert

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

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