Hi Bill,
George's questions are important. ENIG 'Black Pad' happens mostly to people [that is, suppliers & users] new to ENIG.
You do not give enough details, so a proper diagnosis is impossible at this stage.
Werner


 


 

-----Original Message-----
From: [log in to unmask]
To: [log in to unmask]
Sent: Tue, Oct 20, 2009 7:21 pm
Subject: [TN] ENIG Issue










Fellow TechNetters:  I ran into a problem and I am looking for more information.  
We had some PCB made with ENIG for SMT applications.  We populated the backside, 
ran them through the convection oven, the solder fillets were fine.  Populated 
the first five (5) PCBs on the topside, ran them through the convection oven, 
and the solder fillets were quite bad, actually dewetted.  Could not even be 
touched up.  Tried two (2) more random PCBs and got the same results.  Never 
have run into this before but have been told it is NOT a unique problem.  Has 
anybody had this happen?  Have to tell our customer that they are not going to 
be getting their PCBs on time and would rather not look like the north end of a 
southbound mule.



Thanks in advance for your assistance.



Bill Black

1 631 667 9699   X13

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