Hi Scott,

Hope you still remember me from Gul currently with Sanmina-SCI.
What was the gold thickness on the below mentioned ENIG boards, you have
mentioned 5 microns, I presume this is Nickel thickness. If the gold is very
thin <2u" (microinches) then depending on the environment the boards are
stored in & the cleanliness on the surface after the ENIG process the boards
would get darkened very fast because of the intermatallics & the nickel
tends to surface up which would get oxidized very fast & turns black.

Thanks,
Krishnan
SANMINA-SCI
Quality Assurance / NPI Manager
E-mail: [log in to unmask]
Phone (Off): 082-363000 Ext. 1602
Mobile: 012-8888-379

-----Original Message-----
From: Scott B. Westheimer [mailto:[log in to unmask]]
Sent: Friday, February 20, 2004 12:12 AM
To: [log in to unmask]
Subject: [TN] ENIG

Looking for some inputs. I just recently came across a situation with some
boards that were ENIG finished that turned dark in color after a couple of
days. They appeared fine after processing but as time went on the finish
started to look almost dull gray. After processing and tape testing they
were fine. Thickness was around 5 microns. Has anyone seen this problem
before? Any inputs would be helpful.

Regards
Scott B. Westheimer
5709 Clarks Fork Drive
Raleigh, NC 27616
Phone: (919)713-4358
Fax: (919)713-4358
Cell: (919)274-4556
Email: [log in to unmask]


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