Electronics Forum | Wed Nov 04 11:00:00 EST 2009 | tstrat
That is interesting, I have not seen that as a requirement before. From what I read if it is less than 7 wt% the corrosion resistance is pretty low, but if the value is too high it indicates that "black pad" is present from nickel corrosion. From wha
Electronics Forum | Thu Jul 15 06:27:50 EDT 2010 | xps
Hi after an enviromental test 85C/85RH, for 3 months (powered), of an electronic assembly with edge finger tabs ENIG finished (nickel 5micron, gold 0.02micron), the nickel disappears completely under the gold (due to corrosion, I think). Does anyone
Electronics Forum | Thu Aug 05 11:02:18 EDT 2010 | davef
Corrosion of soldering equipment!!! That would be the least of our concerns. Propyl Bromide has a flash point of 21*C [70*F]. It's not real stable. It's flammable. It's ready to go at room temperature. Have someone else operate those machines an
Electronics Forum | Fri Apr 19 07:34:37 EDT 2013 | davef
Hola Jorge I can't make-out the corrosion on your board. Do you have a better picture? Since your fab told you not to worry, in that, did he / she describe the corrosion and it's source? On your base question 'should I ...' In the works of Ronald
Electronics Forum | Tue Dec 15 10:16:55 EST 2015 | mbb
I had a problem with PCB pads: soldering process couldn't be performed because soldering pads of component in the PCB are oxydized. Is there any solutions to eliminate the corrosion on the pads in order to avoid there scrap because we 're talking abo
Electronics Forum | Tue Jul 16 10:15:12 EDT 2002 | robbied
Hi, we have recently had some customer returns where the 44 pin j-lead ASIC devices exhibit green corrosion from the copper under the tin plating on the leads. These boards were in the field for around 4 years, with innadequate conformal coating pro
Electronics Forum | Fri Feb 13 12:16:05 EST 2004 | Mike Konrad
Ashok, It is most likely not the DI water that is attacking the aluminum rather it is the saponifier. DI water is only in contact with the parts for a relatively short time. If your cleaning process provides for a rapid drying cycle, you should be
Electronics Forum | Sat Jul 28 08:37:52 EDT 2007 | davef
There is no good choice. Board Finishes: Industrial/Battelle Class 3 Environment [Reliability Knowledge Gaps: For use of Pb-free solders in High Reliability Applications, J Smetana, iNEMI Availability of SnPb-Compatible BGAs Workshop, March 1, 2007,
Electronics Forum | Thu Apr 20 14:59:11 EDT 2017 | davef
It's difficult to tell anything from your picture. But playing the odds, I'd say it's not "gold corrosion." It is very difficult to corrode gold. Gold is a NOBLE metal. From Wikipedia, the free encyclopedia In chemistry, the noble metals are metals
Electronics Forum | Tue Oct 20 05:47:42 EDT 2020 | Mike Konrad
Most often, dull solder joints (post cleaning) is a result of the cleaning chemical. Most (not all) modern cleaning chemicals are equipped with corrosion inhibition agents which prevent dulling. Check with your chemical supplier to see if your specif
