Electronics Forum | Fri Aug 22 02:40:31 EDT 2008 | kelson
Hi All, I have question regarding the PCB. My PCB is immersion silver furnished. I found out that the board is darkening from immersion silver to yellownish colour after exposed to the environment. From my finding, i think it may be caused by the su
Electronics Forum | Fri Aug 22 10:01:52 EDT 2008 | robinj
I have seen this problem before. If the color is yellow usually it is caused by moisture left on the boards from poor drying after immersion silver. One of the ways to get rid of this is by dipping in acid cleaner solution. If the board supplier uses
Electronics Forum | Fri Sep 12 17:07:05 EDT 2008 | davef
While you're waiting for others to reply, check these recently posted threads on discolored immersion silver [IAg] here on SMTnet: * http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=56220 * http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Mes
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 | Wed Feb 12 22:02:47 EST 2014 | rober864
Has anyone ever encountered contaminants from the immersion silver process, whether it be from the board house or not...as it relates to conformal coating. The failure mode is severe de-wetting of acrylic conformal coating. All over solver resist, to
Electronics Forum | Wed Feb 11 09:07:37 EST 2004 | Ashok Thiyagarajan
HI I am currently having a wafer which is stud bumped (Au), I am printing conductive adhesives (with silver fillers) on the pads , and by thermocompression bonding, I am establishing the connnection between. But right now the problem is the silver
Electronics Forum | Wed Nov 07 21:36:17 EST 2012 | davef
Multiple process and rework thermal cycles are brutal on boards and components. Improving reliability of products through reducing thermal stress ends-up being a major driver to the interest in lower MP LF solders. Binary LF solders require the addit
Electronics Forum | Mon Dec 17 12:06:58 EST 2007 | pjc
5 Steps to Eliminate Bridges: 1. Establish (wave) Parallelism First and foremost, you must establish board-to-wave parallelism. This is the prerequisite to any wave solder process control. For an understanding of the power of this approach go to ht
Electronics Forum | Sat Apr 24 10:43:31 EDT 2010 | davef
Hege: Sounds like this customer is a putz. Ask the putz to sign a release, acknowledging responsibility. Here's a couple more links on imm silver: * http://www.pcbdesignschool.com/wp-content/uploads/2009/08/the-study-measurement-and-prevention-of-t
Electronics Forum | Fri Aug 28 23:32:39 EDT 1998 | Pete Sorenson
| Does anyone have any experience they are willing to share on Ag epoxy used as a copper through hole plating replacement? Was CEM3 used? | What are the limitations? | Thanks, | Steve I have used silver epoxy extensively for conductive bonding applic
