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October 2009

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Wed, 21 Oct 2009 19:39:50 -0400
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To ALL Fellow Tech Netters:  I truly want to thank you ALL for the fast responses I received and most importantly the content of what I received.  We have been using ENIG now for approx. five years, from various houses, and never had this issue come up.  Having a PCB manufacturing background, I was able to steer myself in a direction, which was reinforced by the responses I received.  The customer was satisfied with my answers, however I am sure that it is not over yet.

Has anyone come up with a pass /fail test other than processing a PCB through the process twice before releasing the run to production?

Thanks again to ALL.

Best regards,
Bill


-----Original Message-----
From: Paul Edwards <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, Oct 21, 2009 1:46 pm
Subject: Re: [TN] ENIG Issue



Bill,
Have seen it...
Had SJ separation of parts from PCAs under perfectly formed fillets...
n the same PCA had T/Hs de-wetting in barrels and on annular rings...
Agree with Rex on the probable cause (passivated Ni under Au)...
Only recovery action that seems to work is to have the PCAs HASLed with a fairly 
ggressive flux to clean off the Ni and cover with solder...
Otherwise get new PCAs...
The de-wetting will drop parts that look well-soldered anytime and anywhere...
Paul
Paul Edwards
urface Art Engineering
-----Original Message-----
rom: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
ent: Tuesday, October 20, 2009 4:21 PM
o: [log in to unmask]
ubject: [TN] ENIG Issue
Fellow TechNetters:  I ran into a problem and I am looking for more information.  
e had some PCB made with ENIG for SMT applications.  We populated the backside, 
an them through the convection oven, the solder fillets were fine.  Populated 
he first five (5) PCBs on the topside, ran them through the convection oven, 
nd the solder fillets were quite bad, actually dewetted.  Could not even be 
ouched up.  Tried two (2) more random PCBs and got the same results.  Never 
ave run into this before but have been told it is NOT a unique problem.  Has 
nybody had this happen?  Have to tell our customer that they are not going to 
e getting their PCBs on time and would rather not look like the north end of a 
outhbound mule.

Thanks in advance for your assistance.

Bill Black
1 631 667 9699   X13
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