Electronics Forum | Tue Aug 21 05:05:52 EDT 2007 | vangogh
Hi All, I would like to get some inputs regarding this.... I have bare PCB which were stored with kapton tape attached on the Au plated pads. These were stored for close to a year. Upon removal of kapton tape, we noticed discolorations on the edges o
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 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 | 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 | Mon Nov 13 20:55:11 EST 2000 | Dave F
Not too much to go on, bud. Tell us about: * Wire material, finish, insultation, etc * Wetting problem description * Why feed that the wire is used for through is important * Range and extent of the problem * Results of metallographic analysis of "g
Electronics Forum | Sun Nov 27 05:06:25 EST 2011 | siaomuay
Hello I'm just study PCB in my company. I found many Surface PCB have some contaminate and can not specify what it is. Size is around 2 mm2 . Sometime I send to supplier and they said it is solder paste or some dirty flux. please see contaminate1
Electronics Forum | Thu Aug 16 13:06:59 EDT 2007 | shing
Will solder contamination related to PCB's surface finishing?
Electronics Forum | Wed Nov 30 09:19:57 EST 2011 | siaomuay
Dear Shean Dalton Peak temperature 240'c and we use IPA for cleanning Pcb surface before mounting
Electronics Forum | Tue Nov 29 11:09:59 EST 2011 | Shean Dalton
Siaomuay, What is your flux and peak reflow/rework temperature? Do you use chemistry in your cleaner? Regards, Shean Dalton
Electronics Forum | Sat Dec 03 17:21:45 EST 2011 | davef
We can't tell much from your pictures, except there are rounded gray blobs that could be solder. If that's the case, you need to get that solder hotter. Please give us the temperature readings of those blobs during reflow. You mentioned that you're
The SMTA membership is a network of professionals who build skills, share practical experience and develop solutions in electronic assembly technologies and related business operations.
Training Provider / Events Organizer / Association / Non-Profit
6600 City W Pkwy
Eden Prairie, MN USA
Phone: 952-920-7682
