To get the ions to do what yu want you need kV, 12V will definately not work. Even with a couple kV the ions will still move slowly along the inside wall of the tubing. This is all in all a bad idea.
My advice is to stick to a corrosion inhibitor such as redline or purpleice, and electrically isolate your rad and block. Even better would be changing it to an all Al or all Cu system.
Edward
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