Electronics Forum | Thu Aug 30 14:51:15 EDT 2001 | slthomas
Dave, you underestimate my cynicism. Still, how clueless does someone have to be to think that a move like that won't result in decreased sales and more damage to an already tarnished (OK, highly corroded) reputation? At least Sean occasionally ID
Electronics Forum | Mon Dec 22 18:08:38 EST 2003 | Tom B
Dave is absolutely right! A question is there free standing DI water left on Parts after wash and rinse, if so this can definetly exacerbate the problem. You can try to remove excess DI water by using an IONIZER air source to blow off any water. S
Electronics Forum | Wed Jun 22 15:03:12 EDT 2005 | patrickbruneel
The only thing ammonia can do is tarnish copper and make it more difficult to solder. And the higher temp in lead-free will discolor the latex (giving it a sticky surface), but the functionality of the mask will be intact. There should be greater co
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 | Tue Sep 02 16:07:04 EDT 2008 | blnorman
Colorization is relatively uniform across the board. "Processing" is first pass reflow. I belive MacDermid is the ImmAg supplier. Plating thickness has not been determined, our XRF is being revitalized. Elemental analysis did show a large copper
Electronics Forum | Tue Sep 02 22:08:34 EDT 2008 | davef
MacDermid Sterling seems to take-on a brownish tint in high dew points. Look at figure 3, p14 here: http://www.enthone.com/docs/CircuiTreeNov2006ImAgStudy.pdf We not so sure that it's fatal. That you see Cu makes us nervous. Since your XRF is doin
Electronics Forum | Fri Jan 16 16:36:07 EST 2009 | boardhouse
i would not try to chemically clean the finish, you would just be asking for other problems. 1) I would ask your supplier their Hasl mix. Standard Lead hasl is 63/37 - it almost sounds like your boards have a higher content of Tin and your experien
Electronics Forum | Fri Apr 23 14:27:22 EDT 2010 | hegemon
I am concerned about a 'tarnishing' effect after moisture bake out that affects solderability on a batch of PCBs. This finish is new to us,and I am wondering if anyone has ideas about how to drive the moisture out of the boards without compromising
Electronics Forum | Mon Jan 06 11:41:52 EST 2020 | robl
JDT http://www.DEKHEAD.com if you are in the USA Adamtech http://www.adamtech.co.uk/contact.asp if you are in Europe There are some good Chinese suppliers, but a lot of Far East cards can be tarnished & with a reduced life due to running in a high h
Electronics Forum | Wed Jun 30 11:38:05 EDT 1999 | Brian Conner
| We are wave soldering some fabs with a lot of unmasked trace area along the edges. The trace area is solid copper covered with tin / lead, no masking, no components along the edges, same on solder side and component side (goofy board design). Ins
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