Congratulations. Sounds like you are the proud owner of Black Pad Disease or
better known as Black-line Nickel (BLN), an unpredictable low-level defect
of ENIG. It has been traced to electroless nickel plating bath contamination
by uncured soldermask, although I'm not convinced this is the only cause.

Good Luck,
Bruce Misner

> ----------
> From:         Marki Sasportas[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Marki Sasportas
> Sent:         Monday, July 22, 2002 8:03 AM
> To:   [log in to unmask]
> Subject:      [TN] Au-Ni coating
>
> Hello All,
>
> I have problem in BGA rework, In some cases after, heating specific zone
> on
> the board ( gold finish)
> A near BGA joints are being defected. After taking off this BGA I noticed
> that some of the pads are black,
> What can cause the problem?
>
> Thanks in advance,
> Sasportas Marki,
> CreoScitex Corporation Ltd.
>
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