Electronics Forum | Thu Aug 29 09:55:37 EDT 2002 | davef
Sounds like hyper-corrosion of nickel, commonly referred to as 'black pad', in ENIG solderability protected boards. Search the fine SMTnet Archives to get started. Additionally, the July - September 2002 'Journal Of Surface Mount Technolgy' has an
Electronics Forum | Tue Dec 05 21:19:14 EST 2006 | Jack
Hi Doug, I think you are right..Let me do some EDX on other location to see any nickel oxide...BTW, is this black pad reworkable?? If yes, how? Thanks in advance,..
Electronics Forum | Tue Jun 13 04:42:26 EDT 2006 | yqdeng@gsl.com.hk
What is "Black pad"in ENIG(Electroless nickel/immersion gold), how to solve if it happen in SMD BGA solder joint?
Electronics Forum | Mon Oct 25 21:49:14 EDT 2004 | davef
First, any results of pull or shear tests are unscientific at best. [We pop our BGA from boards with, appropriately enough, a beverage can opener.] Second, we have no have problems with your ENIG specification. Third, as with your customer, we'd e
Electronics Forum | Mon Oct 20 17:03:05 EDT 2008 | davef
Josh From looking at your pix, we don't have a clue. [And we're going down to the nurse's station to get our eye checked because we don't black bubkus.] More than anything else the: * White on the pads could be solder * Copper-penny brown on the pad
Electronics Forum | Wed Apr 21 17:08:32 EDT 2004 | dave
Congratulations on your new customer. This could be a keeper. Here's what you're familiar with: Electroless Nickel - per MIL-C-26074 and ASTM-B733. Electroless nickel describes the plating of nickel deposits, which may contain phosphorus and boro
Electronics Forum | Thu Mar 02 11:56:04 EST 2000 | Dave Pearcy
We are experiencing the same problem. We just spent $1,200 to figure out that the "black stuff" is a Nickel Oxide. I am going to look into the profile end of this problem. Any suggestions would be very helpful. Dave
Electronics Forum | Thu Mar 02 11:56:04 EST 2000 | Dave Pearcy
We are experiencing the same problem. We just spent $1,200 to figure out that the "black stuff" is a Nickel Oxide. I am going to look into the profile end of this problem. Any suggestions would be very helpful. Dave
Electronics Forum | Mon Apr 18 11:26:38 EDT 2005 | davef
Whenever we hear "gold" and "balls falling off", we think of black pad [hypercorrosion of nickel]. What does your EDX show?
Electronics Forum | Fri Apr 29 14:16:16 EDT 2011 | ppcbs
Below is the long explanation. This defect is most commonly found with BGA components, but can arrise with all components. I see it happening more now with lead free boards that are being assembled with a no clean flux. Best short term remedy is t
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