So basically, the nature of the radiator just doing what it does is what causes the corrosion and hence the leak. Hmmm...ya learn something new every day.

Has anyone ever studied those sacrificial anodes that you can buy that attach to the radiator cap? I saw a few ads for em, they're just little cylinders of some conductive metal that are designed to direct all the electrolytic properties to that one anode. Anyone know if they work? Might be a good investment.