Not more than usual...

I do wonder if the occassional road salt will speed-up the process at hand here.
We've had a very mild winter here uptill now with only one-or-two road salt applications.

As for the electrolysis, I understand, but wouldn't that be happening on the inside of the cooling system where the coolant actually touches the copper (and iron and aluminium).

I could try and stick a voltgauge on various places in/on the cooling system to find voltage-differences.

I've also been thinking of insulating the radiator from the frame it's mounted to. But then again, millions of cars have been made this way. If there was a problem it would have become apparent very quickly I think.