-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Russell
Burdick
Sent: Thursday, November 14, 2002 4:04 PM
To:
[log in to unmask]
Subject: [TN] gold solderaility
Hello
everyone!
I could use some help concerning soldering to
gold.
Problem:
A customer of ours has given feedback to our
salespeople that hard gold
boards we made in May 2002 were much better to
solder to than what we sent
in October 2002. Biggest difference was stated as
the newest boards have
fiducials that auto pick and place equipment can't
read because under the
lights they look "black". Under normal shop lights
both boards look bright
and shiney(sp?).
Also, the customer commented
that on the boards with "black" unreadable
fiducials had solderjoints that
looked very dull.
Known manufacturing/processing differences between
months of May and October
(aka, confessions of a process engineer):
Prior
to August 2002, dull plated gold boards were scrubbed to improve
appearances.
After August 2002 no scrubbing needed when a carbon treat and
proper wetters
were performed/maintained in nickel and gold baths.
Any and all
comments are greatly
appreciated.
_________________________________________________________________
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