Electronics Forum | Thu Aug 23 09:52:38 EDT 2007 | d0min0
Hi, in past we had an issue with ENIG surface, black was Ni that get pass the Au - but it was discovered after reflow (SnPb) and the IC was losing contact with Cu tracks...at customers application :| Reason was as I remember too thin Au sufrace... w
Electronics Forum | Sun Aug 26 11:27:12 EDT 2007 | vangogh
Hi Davef, Thanks for the reply. There seem to be no issues on SMT reflow based on some samples done. We have not stripped the gold yet. We did a X-section+EDX and we are seeing traces of copper on the nickel layer. Any idea what is the implication of
Electronics Forum | Mon Aug 27 08:03:32 EDT 2007 | davef
Actually, you will be soldering and wire bonding to the palladium layer, so we should have asked if you checked that layer, rather than the nickel. We not sure of the source of the copper that your see on EDX. It's possible copper from the pad migra
Electronics Forum | Thu Aug 30 09:49:32 EDT 2007 | blnorman
EDS @ 10kV maybe going too deep. I've talked to a surface science physicist that recommends Auger spectroscopy because it's more of a true "surface" examination tool.
Electronics Forum | Thu Apr 15 11:15:30 EDT 2004 | patrickbruneel
Pure (red) copper oxide is green, its not a residue its just oxidation. In your case water and heat will accelerate the oxidation process of unplated or unprotected pure copper. The best way to avoid this from happening is use a socket with tin or n
Electronics Forum | Fri Nov 08 18:32:39 EST 2013 | hegemon
Dave is right, though apparently a bit grumpy today. What he's saying is that the ring de-wetting is a bad thing, and should have been called out by your lab. You might consider a lab change in the future. Some information about your processes, an
Electronics Forum | Mon Nov 11 10:51:40 EST 2013 | dyoungquist
Are you using lead or lead-free solder? 260C would be good for lead solder but may be a bit low for lead-free. We run our lead-free selective solder pot at 300C although we do not have any pre-heat or top heat, just hot nitrogen blowing around the
Electronics Forum | Tue Jan 20 16:26:59 EST 2015 | emeto
There are a lot of lead testers out there. Just google it. I personally don't think you will find anything wrong, but for the pleasure of your customers buy one and prove it. I would also check the lead on the squeegees of your stencil printers and t
Electronics Forum | Fri Nov 08 17:49:05 EST 2013 | davef
First, it's a surprise that your failure analysis lab thought everything was OK with these boards. They look like shit. Second, a few years ago, there was a bunch of complaints about ENIG boards with issues similar to what you're observing. There wa
Electronics Forum | Wed Nov 13 18:00:59 EST 2013 | davef
It's too bad that SMTnet won't let us view your pdf. I asked the geeks to fix that. If someone really want to read it Matt can likely get it off to you. Is it OK to do that, Matt? Anyhow, the Trace Labs report seems to be focused on some SMT pad dis
