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February 2009

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 11 Feb 2009 13:23:14 -0600
Content-Type:
text/plain
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text/plain (147 lines)
Can you share the photos of the cross section?



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Wednesday, February 11, 2009 12:51 PM
To: [log in to unmask]
Subject: Re: [TN] CRACKED ENIG PADS

Lee,

When you say "Evidently" that you have done cro


Lee,

When you say "Evidently" that you have done cross sectioning and see
that the cracks are only in the Ni and Au and not in the Cu?  Since you
said "There was no evidence of a lack of bonding between the copper and
the ENIG finish" that implies to me that you did cross section but since
I wasn't sure I thought I'd ask.

Regards,
George
George M. Wenger
Andrew Wireless Solutions
Senior Principal FMA/Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 (Office) (732) 309-8964 (cell)
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, February 11, 2009 1:42 PM
To: [log in to unmask]
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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