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topic 9994

Conductive chromates for aluminum


We plate aluminum pads for electronics. As part of the process flow, the aluminum is chromated with a solution consisting of a Cr (III) compound, a fluoride and a tin (4) compound. The chromate is conductive. We find occasional corrosion that we suspect may be due to high levels of fluoride and chloride in the chromate solution. Is anyone aware of any commercial or non-commercial chromate formulations that provide both corrosion protection (without the use of significant amounts of fluorides or chlorides) and a conductive surface?

Charles Rosenstein
- Jerusalem, ISRAEL


I'm not really sure if this will work as base for plating on aluminum but if you're looking for chrome-based corrosion protection, you might try Alodine or Iridite process.

Dado Macapagal
- Toronto, Ontario, Canda

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