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| Date: | Fri, 15 Jul 2011 06:46:38 -0400 |
| Content-Type: | text/plain |
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Gabriela,
Silver was originally added to solders to help prevent / slow down diffusion from silver plated parts during the soldering process. There are some papers on this available. There are also papers that show addition of silver makes SnPb stronger, but the increase in strength does not correlate to improved reliability
Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.
-----Original Message-----
From: Gabriela [mailto:[log in to unmask]]
Sent: Friday, July 15, 2011 3:39 AM
To: [log in to unmask]
Subject: [TN] Silver embrittelment in solder joints
Is there anyone who studied if tin lead solders with 2% silver used for
soldering gold plated leads are less reliable than the classic 63/37
tin/lead solder for the same application because of silver embrittlement in
addition to gold embrittelment?
The late Werner Engelmaier published an article:
<http://www.globalsmt.net/smt/index.php?view=article&catid=42%3Acolumns-wern
er-engelmaier&id=13358%3Asolder-joint-embrittlementits-not-just-gold&format=
pdf&option=com_content&Itemid=65>
http://www.globalsmt.net/smt/index.php?view=article&catid=42%3Acolumns-werne
r-engelmaier&id=13358%3Asolder-joint-embrittlementits-not-just-gold&format=p
df&option=com_content&Itemid=65
This article explains silver embrittelment as an addition to gold
embrittelment in lead free solders used for soldering gold plated leads
with SAC.
Is there a correlation between my question and the article?
Gaby
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