What created the sited anomaly and how was it resolved.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Wednesday, October 26, 2011 11:21 AM
To: [log in to unmask]
Subject: Re: [TN] Discoloration on plated over vias
Once again, thanks everybody for the replies on my problem below.
I got one more question:
What test method would indubitably determine if the orange spots are Cu that surfaced?
Thanks,
Ioan Tempea
Dear Technos,
I got this issue, see http://ipc-technet.groupsite.com/gallery/21662
So 6 layer, 2oz Cu per layer PCB, epoxy filled vias and plated over. After assembly we see 4-5 vias having reddish stains, on most boards. Had it analyzed, no trouble with via integrity, no cracks in cover plating, no migration of fluids from inside out. FTIR does not detect any surface contamination.
Au plating thickness stands at 2.09 micro inches.
Nothing special detected in the stains, so the lab concluded what we see is an optical effect due to a certain roughness of the Cu. The logical conclusion is no issue, cosmetic defect.
However, our end customer, high reliability, want to know what the stains are and want absolute confirmation that long term reliability is not affected. Also, we've been warned that no such issues will be tolerated on future lots.
My questions to your infinite knowledge is: have you seen this before? How can I convince the customer everything is OK? What is the root cause and how can I get rid of the issue?
Many thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
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