Electronics Forum | Sun Sep 08 19:58:57 EDT 2002 | dasal
My specialty. Your right, Most corrugated contains S02 and the pallet is usually out gassing formic acid as well. Not a great environment for silver. Original press release follows: Reactive Polymers At AT&T Bell Labs, John P. Franey has developed
Electronics Forum | Thu Jun 08 09:43:42 EDT 2017 | davef
You know the scary part about your mentioning a tread where I post something? Well. let's just say that 2007 was a long time ago. Anyhow, silver will dissolve into your solder and provide no barrier. Some people apply a silver flash plating over the
Electronics Forum | Thu Jun 08 16:12:19 EDT 2017 | davef
Your plater's recommendation should work fine. Your simple copper plate will work, but you'll be stepping into fighting a copper tarnish battle. Silver over the copper is a better choice. I was thinking a silver thickness of a minimum of 3 microns
Electronics Forum | Thu Sep 17 23:36:35 EDT 2009 | Sean
All, We know that incomplete immersion silver could potentially lead this creeping corrosion. Is there any way to check bare PCB for incomplete immersion silver coverage, especially on the via hole area? Thanks, Sean.
Electronics Forum | Tue Sep 08 14:35:12 EDT 2009 | davef
Maybe your solder mask supplier can provide additional background
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 | Tue Sep 22 08:55:48 EDT 2009 | geb
Hi Chris, We've had another supplier say that it is the silver or combination of tin with silver that causes the corrosion. Would you agree?
Electronics Forum | Thu Sep 03 12:03:52 EDT 2009 | Sean
Hi All, I have few questions about creeping corrosion that potentially happen on lead free immersion silver PCB as below: 1) What test that we can conducted to verify whether the failure we seen is due to creeping corrosion? 2) I heard that lead fr
Electronics Forum | Thu Sep 03 14:21:29 EDT 2009 | davef
Creeping corrosion occurs on bare metal. Most commonly, it is seen on boards with thin protective coatings [eg, bare copper, immersion silver, organic solderability preservative]. Look here: * enthone.com/docs/AlphaSTARCreeping.pdf * circuitree.com
Electronics Forum | Fri Sep 04 07:26:23 EDT 2009 | Sean
Dear Davef, Thanks for sharing with me..I observed this creeping corrosion tend to appear on PCB via hole rather than other PCB location. Why this problem did not appear on PCB traces? Besides, I also notice that this problem only appear on the PC
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