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February 2009

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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Wed, 11 Feb 2009 21:50:06 +0100
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As I said, CTE mismatch + brittle Ni
my two atoms
Inge
----- Original Message ----- 
From: "Steve Gregory" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 11, 2009 7:41 PM
Subject: Re: [TN] CRACKED ENIG PADS


Hi Lee!

Have your pictures posted. They are here:

http://stevezeva.homestead.com/files/THROUGH_HOLE_CRACKS-1.jpg

http://stevezeva.homestead.com/files/THROUGH_HOLE_CRACKS-2.jpg

I have to let those that know more about plating than I do answer this
one...

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Wednesday, February 11, 2009 12:20 PM
To: [log in to unmask]
Subject: [TN] CRACKED ENIG PADS

I have asked Steve to put up a pair of pictures I received. They are of
cracks within the ENIG finish of a PWB. I know that the board failed,
based on IPC-6011 and IPC-6012.

My question is what would cause the cracking? Evidently, it is in the
Nickel layer and the copper layer was not compromised. There was no
evidence of a lack of bonding between the copper and the ENIG finish.
These boards are fresh from the supplier.

Just curious...

Thanks in advance.

Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]


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