It should be worse with the eutectic, as it contains less Sn. Vladimir SENTEC Testing Laboratory Inc. 11 Canadian Road, Unit 7. Scarborough, ON M1R 5G1 Tel: (416) 899-1882 Fax: (905) 882-8812 www.sentec.ca -----Original Message----- From: Gabriela <[log in to unmask]> Sender: TechNet <[log in to unmask]> Date: Sat, 16 Jul 2011 17:17:52 To: <[log in to unmask]> Reply-To: TechNet E-Mail Forum <[log in to unmask]>, Gabriela <[log in to unmask]> Subject: Re: [TN] Silver embrittelment in solder joints Thank you all for the answers. I think that I formulated my question a little clumsy. I am also interested if there was a research COMPARING the solder joint embrittlement for the following two situations: - Soldering a gold plated lead with Sn/Pb 63/37 solder - Soldering a gold plated lead with Sn/Pb/Ag solder Gaby -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: ו 15 יולי 2011 15:37 To: [log in to unmask] Subject: Re: [TN] Silver embrittelment in solder joints Hi Gaby - the issue of silver embrittlement was a topic that Werner and I had long, torturous, fun, engaging discussions about silver embrittlement (I miss Werner, he would have some great comments on this topic). Werner was a participant in a industry consortia in the 1980's where a silver embrittlement issue happened with some CLCC components. The project data was semi-restricted so a complete report was never published. The IPC 4-14 committee did some of the most recent work on the topic - look in the IPC 4553 specification, Appendix 6 for a summary of that work. Also IPC-TR-586 contains the entire test report covering the thermal cycle testing the committee completed. A version of the TR-586 was also published in the 2008 SMTA Toronto Conference proceedings. It takes a greater silver content in a solder joint to cause embrittlement than gold content. The 4-14 committee showed that you can have up to 30 uinches of immersion silver surface finish and not have an embrittlement situation under standard SMT process conditions (and there is no reason to have 30 uinches of ImAg on a pwb!). The amount of silver in Sn62, even combined with a typical ImAg surface finish, won't result in a silver embrittlement situation. Werner had a good point on SAC solder - all sources of silver need to be accounted for when determining if you could have too much silver - the silver content of the solder should not be overlooked. Hope this helps. Dave Hillman Rockwell Collins [log in to unmask] Gabriela <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 07/15/2011 02:38 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Gabriela <[log in to unmask]> To <[log in to unmask]> cc 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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