Oxidation may or may not be beneficial. Stainless steels, for example, rely on oxidation to protect themselves. Chromium oxide forms literally within thousandths of a second upon cutting stainless steel. It is this oxide that resists further corrosion in stainless steels.
Some weathering steels use copper as an alloying agent to form a protective layer of oxide. You used to see this in light posts, etc. Not sure how much it's used anymore.
Imposing an electrical charge to fight galvanic corrosion isn't easy. The voltages and currents are neither completely steady nor very large. Use lots of electricity and you have yourself an electro-plating operation, albeit not a very efficient one. In some cases you'll find "sacrificial" metals used to reduce galvanic corrosion. It's been many years since my material science class that talked about all this, so I'm a little "rusty" on the details.
