Electronics Forum | Sat Feb 16 20:13:45 EST 2019 | sarason
Your silver immersion layer is dissolving in the solder. I presume this is what is meant to happen. But with copper tracks underneath that should be fine. Does your SAC305 cover all of the pad. If so no problem. If not then you will need to flux your
Electronics Forum | Tue Jul 06 11:58:44 EDT 2010 | baildl632
What type of finish are the PCB's? HASL, tin immersion, silver immersion,........we've seen all the above problems with HASL finished boards. Usually either reheating w/ a soldering iron or "burnishing" with a scotch brite pad has worked for us.
Electronics Forum | Mon May 24 16:34:03 EDT 2004 | Mark
I just got a report from MacDermid on Solder Mask Interface Attack Issue (SMIA) with Sterling Silver Process. Corrosive chemicals in the ImAg process get trapped under the soldermask edge and eat at the copper trace. They are experimenting with diffe
Electronics Forum | Wed Jun 21 03:07:35 EDT 2006 | yme111
Hi, Can anybody help me how to visually identify which is SILVER and IMMERSION SILVER PCB? Your reply on this is ver appreciated. Thanks a lot
Electronics Forum | Wed Jun 21 08:28:13 EDT 2006 | don dawson
I think all silver on a bare board is Immersion. We are a bare board manufacturer and that is the only silver I'm aware of being used as a finish. What is the problem you are having?
Electronics Forum | Sat Jul 28 08:34:12 EDT 2007 | davef
Sterling is a Mac Dermid [www.macprintedcircuits.com/final] product. They should be able to help make the distinction that you look to make.
Electronics Forum | Thu Apr 20 17:51:14 EDT 2006 | Don
Immersion tin, if it is being correctly identified, is not a final surface finish for a bare board. White tin is typically the way a finish is refered to. Either way tin has gotten a very bad reputation via a couple satellite failures because of tin
Electronics Forum | Wed Aug 27 18:28:29 EDT 2008 | blnorman
We have an immersion silver board that has a brown discoloration after processing. It's not flux residue, that normally doesn't cause this condition. Elemental analysis shows less than 1% sulfur, and I thought silver sulfide is more a black color.
Electronics Forum | Tue Jul 25 10:04:22 EDT 2006 | russ
There reasoning is ignorance. They are most likely concerned about tarnish on PCB surface. We have let immersion silver PCBs sit out open for 10 days in a noncontrolled enviromnent. We had no issues with these assemblies and they were segregated a
Electronics Forum | Sat Feb 16 07:21:17 EST 2019 | SMTA-Joe
I am experiencing a "tarnishing" issue on PWB traces that may be causing problems with component reflow. The PWB traces are made to the following spec: SOLDER MASK OVER BARE COPPPER WITH SILVER IMMERSION PLATING PER IPC4553, PLATING TO BE 8-12 MIC
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