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| From [log in to unmask] Mon Jun 2 09: |
05:48 1997 |
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Hi Zoran -
Many of the users in the ANSIJ-STD-003 PWB solderability committee who
have experience with immersion Au/Ni finishes have reported that a
"good" immersion Au/Ni finish should last 12 months under typical
storage conditions. The critical part of the equation seems to be
finding a finish supplier understands their immersion gold chemistry
and that does a good job of process control. Also take a look at "Fine
Pitch Surface Mount Technology Assembly with Pb free low Residue
Solder Paste", I. Artaki, Soldering and Surface Mount Technology, May
1995, page 27 - it may be helpful. Good Luck.
Dave Hillman
Rockwell Collins
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: ASSY:Au/Ni Coated Boards
Author: [log in to unmask] at ccmgw1
Date: 5/28/97 9:08 PM
Dear Technetters
We have some printed circuit boards with gold over nickel coating which
are experiencing solderability problems, ie very poor wetting. I have
heard that this may be due to nickel migration through the gold over
time. The boards are approximately 6 Months old. Is there a particular
shelf life for this type of coating before we need to dump the boards?.
Regards
Zoran Raich
Process Engineer
NetComm (Aus) Ltd
(+612) 9878 7394
[log in to unmask]
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