Electronics Forum | Wed Sep 09 09:57:15 EDT 2009 | mikesewell
You mention silver pcbs - baking will accelerate oxidation/tarnishing of the finish. Solderability will likely go down...
Electronics Forum | Sat Aug 30 11:42:49 EDT 2008 | davef
Some immersion silver [IAg] products can go brown with aging. On a newly plated board, we expect you to see Ag, C, & O. The amount will vary according to supplier and thickness. Questions are: * How uniform is the brown coloration of the IAg on the
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 | Thu Apr 27 10:35:21 EDT 2000 | Russ
Scott, I am a little confused, when you mention "silver thru hole vs. plated through hole what do you mean. A silver "immersion" type finish vs. HASL (Tin lead)on your PCB? Or are you talking about using silver solder to perform intrusive reflow of
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 | Sat Aug 23 08:43:32 EDT 2008 | davef
Ugh, there are more reasons that immersion silver [IAg] to go yellowish than pigs at the county fair. That aside, sulphur is one of the reasons, as you say. The sulphur can be from a variety of sources, such as: * Pollution in the air * Ill advised p
Electronics Forum | Mon Jun 25 11:33:20 EDT 2012 | davef
The immersion silver is an active surface and readily combines with sulfur from the environment. Silver sulfide tarnishes the surface and creates doubt about the integrity of the finish at inspection. [uyemura.com/library-4.htm] Your customer's boar
Electronics Forum | Mon Feb 05 07:02:11 EST 2007 | CL
ASIR, Findings for us so far: OSP- has worked well for us for single sided boards only. We have seen problems with using it on double sided reflow applications. Also, some customers have specified OSP, but are intolerant of exposed copper. Limited
Electronics Forum | Wed Aug 05 07:46:46 EDT 1998 | Earl Moon
| We have mixed to negative feelings about Omikron, but I beileve it is due to problems with the board fabricator rather than the process itself. When done properly, our Omikron boards have had very good solderability. However, we have had several
Electronics Forum | Wed Feb 02 20:53:34 EST 2000 | Dave F
Dennis: Several points: 1 If you're talking AlphaLevel process (?): � Good solderability, as HASL, even no-cleans bite well. � Planarity, uniform deposit, no bridgin� of FP. � Doesn't store as well as NiAu ... LT 6 months sealed � Very sensitive t
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