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Date: | Fri, 28 Sep 2012 08:32:54 -0400 |
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Bob,
The flux we use for SnPb and SAC is the same.
However, the flux does not work well with SnBi.
The solder looks good, but does not form a good bond to the Nickel (our
boards have NiAu finish).
We use a different flux that is, according to the supplier, formulated with
a lower activation temperature.
It does work better.
Guy
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Thursday, September 27, 2012 1:13 PM
To: [log in to unmask]
Subject: [TN] Flux Activation Temps
Hi,
I was looking though some paste datasheets which show a paste "Family"
available in different alloys.
My Question:
Is a single flux formulation being used with these different alloys? It
seems so.
But the various melting point have a serious range. And I remember from my
college chemistry days that reaction rates double for every 10 C rise in
temp. (Is that still correct?) So I would expect fluxes to be relatively
"Inactive" al low leaded temps but then going super-fast at higher lead free
temps.
Can anyone clarify? Is it a real issue or hogwash-worthy.
Thanks,
Bob K.
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