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Date: | Tue, 8 Nov 2005 13:41:44 -0500 |
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Kevin -
What are the board and lead finishes? I seem to remember this as an
issue when using ENIG or soft gold with Tin-Lead solder.
Jeffrey McGlaughlin, CID
Engineering Designer
Battelle
Columbus Ohio
http://www.battelle.org
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Tuesday, November 08, 2005 12:59 PM
To: [log in to unmask]
Subject: [TN] Grainy Solder Joints
We are experiencing dull / grainy TH solder joints, made by hand
soldering
w/ iron @ 500F. At first, it appeared to be residue on the surface, so
I
started chasing the cleaner. But all checked out OK. I refluxed (water
soluble, ORH0) and reflowed (iron @ 600F). This improved the finished
appearance, but not 100%. While eutectic, the joint is perfect. Then
when
I draw the iron away, it cools and the surface finish is no longer
smooth or
shiny. What can cause this?
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