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May 2004

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 May 2004 08:41:35 -0400
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Charles,
Are the green residues at the toe of the leads?  If so, then as Brian states, you are most likely looking at copper carboxylates.
Bev Christian
Research in Motion

-----Original Message-----
From: Charles Caswell [mailto:[log in to unmask]]
Sent: May 4, 2004 5:43 PM
To: [log in to unmask]
Subject: [TN] Green residue.


I just got some pictures from a customer of what appears to be some green
residue on some of the SMT leads. It is only on a couple of components on one
assembly of five. We used a water soluble paste for the SMT, water soluble
flux for hand solder and washed in a Westek inline cleaner with saponifier. I
have seen the saponifier turn brass a blue/green color but not even close to
this green. There are some connectors and one IC that do not go through the
wash and are hand cleaned first with IPA and then a water rinse. Anybody got
an idea?  Maybe (please) I could get Steve to post a picture. 
Thanks in advance. 

Charles Caswell
The Big Kahuna

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