[CLKWRK]

howdy,
I am no expert in this matter, but I think you mean a "sacrificial metal" or a metal that is more willing to shed its electrons than steel. magneseum perhaps.

If i remember correctly, electrons travel from the anode (+) to the cathode (-), thus postively charging a chunk of magnesium engine case in your car would theoretically have the same effect as this electronic rust control.......am I right?

I dont think this would be effective as your only defense against rust, nothing beats keeping oxygen away by sealing it with some sort of coating.
Bry