Hi Rick,

This request for passivation of a pwb is a little strange to me...
Passivation is typically a process applied to stainless steel. I have not
seen anyone passivate the surface of copper. (not that it couldn't be
done...) If I remember correctly, passivation per Q-P-35 or Mil-S-5002 is an
etching process that removes foreign materials from the surface of the metal
and promotes the oxidation of the surface to create a barrier to corrosion.
Most of your commercial and military plating contractors can passivate. But
they may look at you funny if you are passivating copper. Not to mention the
trouble you will have with  soldering to the board, trying to get through
that oxide barrier...could be tough for the flux... very unusual, I wonder
what the designer is trying to do? Tell me more...

Bill Brooks
PCB Design Engineer
DATRON WORLD COMMUNICATIONS INC.
3030 Enterprise Court
Vista, CA 92083
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
mailto:[log in to unmask]
IPC Designers Council, San Diego Chapter
http://www.ipc.org/SanDiego/
http://home.fda.net/bbrooks/pca/pca.htm


-----Original Message-----
From: Rich Schutz [mailto:[log in to unmask]]
Sent: Friday, June 29, 2001 6:04 AM
To: [log in to unmask]
Subject: [DC] Plating Type


I have a customer asking for "passivating" plating on their PCB's.  Can
anyone tell me what this is and if any board houses can provide it.

Thank you

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