Is this a magnetic field only around your water hose? If so, it will not work in this case. Nuclear Magnetic Resonance (
Basics of NMR) uses close to 10 Telsa (magnetic field unit. How strong is this? It has been known to pull a 20 pound pipewrench 15 feet through the air when it was inline with the magnetic field. I am not going into what it will do to your ‘puter.). Salt solutions can be used without any real effect on the ions (Na, K, Al, Cu, Cl, Br, hydroxide, hydronium) being pulled to one side or another. Unless we are talking about ferromagnetic type compounds, I can’t see it working well or at all. The other aspect is the lightning arc that can be seen with Telsa coils. I don’t think that 75,000 V at 75 mA will be good with any electronic component.
Actually, the best way to stop corrosion in a Al/Cu radiator block will be using a Zinc ingot as your anode on your radiator. They use these things everywhere on ships in salt water and even on steel pipes buried underground to slow the corrosion effects.
-phosphor