Good Morning!
     
     Someday the electronics industry will eventually decide that bright 
     shiny solder joints are not a necessary! If you are soldering to gold 
     finishes you need to make sure that you have enough solder volume to 
     allow the gold to dissolve evenly into the joint AND that your process 
     is such that the time and temperature profile allows this dissolution 
     to take place. You may be able to alter your reflow profile to get a 
     "shinier" solder joint appearance (try some combination of 
     longer/hotter). May I suggest another approach? Using SEM analysis and 
     microsections demonstrate that the solder joint does not have a gold 
     embrittlement reliability risk and then quit looking at the solder 
     joint appearance. Document your materials and process so that anyone 
     who questions the "dull" appearance can see that you have researched 
     the issue and are not inducing reliability problems.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: Assy: Dull solder joint - Gold
Author:  [log in to unmask] at ccmgw1
Date:    11/28/96 8:01 AM


Hi Technetter,
     
Could anyone tell me is there any way to reduce the gold leaching from a gold 
plated board. I am having dull solder joint after reflow.
     
I have heard that hot air reflow will have more gold-leaching as compared to 
Infrared reflow. Please enlighten..
     
     
     
+====================================+ 
Kong Hui  Poh
Process/Equipment Engineering Advisor.. 
Techgate Electronics
Email: [log in to unmask]
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