I'm not sure what being lead-free has to do with corrosion, but here in
the Space Product business virtually all of our hard wiring and cabling
consists of silver plated copper wire.  It's been that way for 40 years
and we have never seen or heard of any corrosion issue.  We also use
solid wire with the same reliable results.  The only corrosion that I
have ever heard of was called "Red Plague" in the early 1960's and was
the result of fractures in too thin silver plating.  A galvanic reaction
was set up between copper and silver at the fracture line that slowly
consumed the copper.  This was resolved by the wire industry by
increasing the thickness of silver plating.  This corrosion is extremely
rare!  Here is a link to a report on the subject.
http://nepp.nasa.gov/docuploads/97164203-A4FB-479A-A075C918D51DD81E/ESA%
20Red%20Plague.pdf


> Rainer G. Blomberg
> Honeywell -Space Systems Clearwater
> Staff Production Engineer
(727) 539-5534


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vargas, Stephen M
Sent: Thursday, March 09, 2006 10:11 AM
To: [log in to unmask]
Subject: [TN] Jumper Wires

All:



     We need to add a 30 AWG jumper wire to a lead-free assembly (Class
II). IPC-A-610 says that silver plated stranded wire should not be used
due to possible corrosion under certain conditions. Our thoughts are
that this (corrosion possibility) is unique to stranded wire. Would
silver plated solid wire be an alternative? Any input would be
appreciated. Thanks.



Regards,

Steve Vargas

Sr. Mfg. Engineer

Polaris Contract Mfg. Inc.

[log in to unmask]

508-748-3399 ext.192




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