Electronics Forum | Sun Jul 06 10:07:03 EDT 2003 | MA/NY DDave
Hi Sam, Great answers so far. Let me take a stab at a few of your questions. Q1. whether this is named Pososity? I can't tell from your description. Several companies and the IPC have porosity tests to see if the Gold has good coverage of the und
Electronics Forum | Tue Jul 08 20:47:38 EDT 2003 | davef
Sam: If your gold overcoat was pourous, the nickel undercoat would corrode prior to your attempting to solder and you would not be able to solder without an aggressive flux. Since you see solder flow and wetting, it indicates the gold did an adequat
Electronics Forum | Tue Oct 26 13:53:16 EDT 1999 | Dave F
William: In answer to your questions: 1 "What do I do about a gold porosity problem?" Get it fixed, before you go out of business!!! You�ve been yapping about it on the internet for three days now!!! Get a more on!!! I don�t understand your com
Electronics Forum | Sat Jul 05 07:30:04 EDT 2003 | AlCapone
If the problem as you described as the gold plating contaminated, and the Nickel layer exposed to the solder pot. However, the purpose of the gold layer is to protect the nickel and copper layer not turn into corrosion and resist to other issue (humi
Electronics Forum | Wed Jul 09 11:58:03 EDT 2003 | sam
When we try another test by using less solder paste, we found under the microscope that the solder was actually stick on the LED gold surface, but not having good wetting. By this finding, we can basically conclude that it was poor solderability caus
Electronics Forum | Tue Jul 08 20:43:03 EDT 2003 | davef
AlCapone: We have an understanding similar to yours, but slightly different. * At 230*C gold dissolves in to solder at the following rate: 63/37: 197 uinch/sec [5 um/sec]. So for a typical ENIG solderability protection, the gold is gone in about a s
Electronics Forum | Mon Jul 07 00:22:38 EDT 2003 | sam
Thanks for all the answers. I should clarify that the problem was found to be on the SMT LED gold plating, instead of PCB gold plating. We had confirmed this problem by running some DOE experiments and some reliability testings. We had decided to d
Electronics Forum | Fri Jul 04 12:32:33 EDT 2003 | sam
I need some advice about a problem that happened in a SMT LED: The failure symphoms of this SMT LEDs is that the LED body itself seemed to be functional, but when soldering on the products, it showed good wetting and soldering, LEDs are bright and l
