Jim Wilkins wrote:

On Apr 8, 1:35 pm, "Michael A. Terrell"
wrote:
RoyJ wrote:

IIRC, you should never, ever, use tin/lead solder on an item made from
silver because the solder becomes alloyed with the silver and forms an
alloy with all of the properties of puppy poop.

Could you be more specific?

Rottweiler

Thanks, now I have rice up my nose.


That's why you stop eating before opening any of my messages. ;-)


Quickly soldering a wire to a gold-plated pad causes a similar problem
by making a brittle gold-lead alloy layer, and the wire and solder may
peel off.
If you heat the solder for a few extra seconds the gold dissolves and
the joint is strong.


That is why they stopped gold plating the leads on the metal cased
transistors. The gold metalic embrittlement would leave what looked like
a perfect joint, yet only make contact at the bare, cut end of the
lead. After enough thermal cycles that would break. In some cases the
lead cold be gently pulled out of the solder to reveal that the gold was
gone from the lead, and had no wetting from the solder.


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