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Date: | Thu, 1 Apr 2010 16:51:00 -0500 |
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Hi Ioan - take a look at the email archive describe by Steve G. - if the
surface finish is bright acid tin then you may have an excess codeposited
plating condition as was described during the Technet conversation on Joe
Kane's question.
Dave Hillman
Rockwell Collins
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Ioan Tempea <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/01/2010 01:37 PM
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[TN] Grainy after wave
Dear Technos,
Please see photo at http://ipc-technet.groupsite.com/gallery/12732
The component is a high current fuse holder, see the vertical mini
-powerclaw, Sn over Ni finish
http://www.andersonpower.com/products/pcb-powerclaw.html
We wave it with SN100C, 525F solder temperature, water soluble flux. As
you notice, the finish on the left contact turns grainy, compared to the
one next to it, that keeps the same look as before wave. The copper plane
connections of the 2 contacts are different, hence a temperature
differential between the 2.
My questions are:
How this happens? Sn starting reacting with the underlying Ni?
Should I worry about this? After all it is only a superficial issue. Can
it alter the functionality of the contacts (they are supposed to see a lot
of Amps)?
Thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
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W | www.digico.cc <http://www.digico.cc/>
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