Op [GMT+1=CET], hakte John Fields op ons in met:

On Tue, 2 Aug 2005 06:42:29 +0200, "Alexander"
wrote:


If you connect Au to Cu and put a Current through it, for best
results AC, the Cu starts corroding at the transistion from Cu to
Au. This is always the case when putting to metals together, the
greater the difference between the metals the faster the corroding
will be.

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That's not true.
You're right it needs also an electrlyt which is most of the times present.