Hi Lee,



While we haven't seen X-sections, I can speculate that the board could have been bent. I saw a few times cracked ENIG as a result of bad handling.



Regards,



Vladimir

------Original Message------

From: Lee Whiteman

Sender: TechNet

To: [log in to unmask]

ReplyTo: TechNet E-Mail Forum

ReplyTo: [log in to unmask]

Sent: Feb 11, 2009 13:20

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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