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Activating Alloy42

Is there a suitable chemicals to remove oxides layer of alloy42 oxides but not react with aluminium as a pretreatment of tin plating. Or is there a chemical to remove alloy42 oxidation layer and aluminum oxide during pretreatment of tin plating?

Yun Liu
- Singapore
2002

citric acid ⇦ on eBay or Amazon [affil link] has been used to activate alloy 42. (usually followed by a nickel strikeNickel strike solution would attack aluminum, therefor cannot be used. citric acid will attack aluminum very slowly and may be suitable. Worth a try. There are proprietary citric acid activators for alloy 42 containing a small amount of a antifungal material. Try citric acid at 860 g/L and a temperature of 49 °C.

Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics"
and "Plating ABS Plastics" eBay or AbeBooks affil links])
2002

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