Zincing the coolant system? Why didn't I think of that!? We use them on our boats all the time in salt water to prevent corrosion between dissimiliar metals.
Here's a primer for those who don't know what the process is. Galvanic action is caused when two diassimiliar metals are exposed to an electrolyte and an electrical current or field. The less noble metal will be sacrificed as it is stripped of its electrons. The further apart on the noble scale the metals are, the faster the degradation.
In a car you have:
1. Dissimiliar metals - steel, aluminum
2. Electrolyte - old, acidic coolant
3. Electrical current or field - Ground strap, alternator, sensors, ignition, short curcuits
Another tip I recently heard was to get those paper ph level strips to periodically test the coolant for acidity. Once it starts to rise, change it out.
I'm fairly cautious about bad coolant now since my aluminum heater core and rad dissolved in my F-150. No need for me to post those pics again.