[MRCG] Lead free "solder"

[Tim]

OK,,good to know.  Apparently even a slight amount of lead in the alloy
prevented the growth.  The capacitor plates in my GRC-9 receiver grew lots
of whiskers.  I guessed they were tin plated when manufactured.  Insidious
little buggers - some weird physics going on there...

About 10 years ago we had our otherwise experienced techs go through a NASA
soldering certification program and the instructor told us the lead free
solders had whisker problems, at least at that time and with the alloys
being used.  He was no fan...We had high end tooling but still had problems
with overheating boards during rework to get the stuff to melt properly.

Progress....

On Tue, Feb 19, 2019 at 7:56 PM Peter Gottlieb <kb2vtl at gmail.com> wrote:

> My understanding is that it is pure tin or zinc under stress that produces
> whiskers and that the solder alloys now used include copper and silver
> which has
> largely mitigated the issue.
>
> Peter
>
>
> On 2/19/2019 10:45 PM, Tim wrote:
> > We had lots of problems with this stuff at work at the time.  Has anyone
> > solved the tin whiskers problems with it yet?  What a mess...
> >
> > Tim
> > N6CC
> >
> >
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