Electronics Forum | Tue May 30 08:46:10 EDT 2006 | patrickbruneel
Interesting read, I guess they finally figured it out (with 32 days left) 2 quotes from the articles "What is surprising however � although it should not be � is that, despite the claims of health and environmental threats, the latter based on the r
Electronics Forum | Wed Sep 07 04:28:26 EDT 2005 | Slaine
were looking at paste, wire, preforms and solder bars (for solder pots), concentraiting on HMP, sn62,96S, and 2 different sac alloys, we also have 7 different fluxes and 16 temination inks (which were also having to change for RoHS because the ink co
Electronics Forum | Tue Jul 04 16:13:09 EDT 2000 | TOOLMANTIM
HELLO BILL I HAVE SOME QUESTIONS FOR YOU 1:HOW ARE YOU CLEANING YOUR STENCIL 2:ARE YOU SINGLE OR DOUBLE PRINTING. 3:ARE YOU USEING VACUUM FIXTURES OR NOT? HERE ARE SOME OTHER THINGS TO TRY. IF YOU ARE CLEANING YOUR STENCIL OFTEN BECAREFUL OF USEING
Electronics Forum | Thu May 25 03:31:17 EDT 2006 | slaine
Hi I manufacture ceramic parts that have a terminations that are palladium/platinum/silver or any combination of the 3. Termination Ink usually consists of 3 main parts the alloy, glass frit and binder. Binder is to help bind everything together whi
Electronics Forum | Thu May 06 13:06:36 EDT 2010 | dwonch
Unfortunately nothing ground breaking to report. The board shops analysis (SEM/EDS)showed high levels of carbon and oxygen, likely indicating an organic based contaminate. They are still stumped on where it is coming from. We recieved some boards y
Electronics Forum | Fri May 07 09:25:55 EDT 2010 | dwonch
Yes, the vias under the BGAs are the only ones capped. I tend to agree with you that the leaching should affect the bottom more than the top and that was actually the case with the two previous shops that had this problem. We suspected with those s
Electronics Forum | Thu Sep 16 20:55:35 EDT 1999 | Dave F
| | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a re
Electronics Forum | Tue Aug 07 19:32:40 EDT 2007 | davef
Zinc from the brass diffuses into the solder and reacts with tin causing dezincification. Dezincification is a specific type of de-alloying, or selective, leaching corrosion of brass fittings. This type of corrosion selectively removes zinc from th
Electronics Forum | Sat Mar 14 09:12:59 EDT 2009 | davef
First, there is no good justification for getting solder on gold fingers. Second, it is well known that solder on gold fingers is unacceptable. So, shipping boards with that condition indicates sloppy quality practices at your CM. Third, that being
Electronics Forum | Thu Aug 06 17:25:55 EDT 1998 | Earl Moon
| Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not ele
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