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Expected life of copper pyrophosphate plating bath
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Hello,
Does anyone have experience on copper pyrophosphate electroless bath? I'd like to know how fast copper pyrophosphate hydrolyses to orthophosphate in bath?
University of Oulu - Oulu, Finland
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Copper pyrophosphate is electrolytic, not electroless. It may (although I haven't heard of it) be possible to use hypophosphite as a reducer in a copper electroless bath (generally, HCHO is used as the reducer).
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James Totter, CEF - Tallahassee, Florida |
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I don't know of an electroless copper bath based on pyrophosphate, but that isn't to say it doesn't exist. However, all pyrophosphate baths should be run at less than 60° C otherwise the pyrophosphate hydrolyses and dissociates to orthophosphate. Hope this helps you.
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Trevor Crichton R&D practical scientist The Pheasantries - Chesham, U.K. |
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Hello,
I noticed that there was a mistake in my original letter. I meant electrolytic copper bath, not electroless. Sorry.
Mia KumpumäkiUniversity of Oulu - Oulu, Finland
August 29, 2008
Dear colleague, if you support pH 9-10 and the temperature 40-50° C, you may use this bath for ages...
Vladimir Krasikov- St.Petersburg, Russia