Leland,
I use an aqueous solution of Enviro Gold #816 from EnviroSense to clean Cu oxidation and OSP on all my OSP PCAs...
It is effective in removing most of the long-term Cu "oxidation" I have seen, although sometimes I have had to heat the solution up to 155 degrees F to get the Cu clean...
I also can modify the solution concentration and temperature to remove the OSP and prep the Cu for SMT, T/H and hand soldering processes...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Friday, May 02, 2008 12:34 PM
To: [log in to unmask]
Subject: [TN] Cleaning of OSP Oxidation
Folks,
I have about 30 OSP boards that have been processed on the bottom side,
were stashed away or misplaced for 6 to 9 months, and recently brought
to me for permission to process on the top side.
Most of these appear to have varying degrees of oxidation, as the
original light orange copper appearance has begun to look more like a 5
year old penny.
Is there a way to salvage this product?
Not only will they get the more complex components (appx. 70% of
assembly cost) during top side build, but they must also undergo wave
soldering of a 132 pin connector and several through-hole power
transistors.
I feel quite uncomfortable with doing anything other than trashing the
product...
Thanks,
Leland Woodall
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