Not that I would try it, but there is an easier way yet if he is determined to use an aluminum rad. Why not the sacrificail anode like aluminum boat motors use in a salt water enviornment? I believe magnesium was the culprit to use the material to use to protect aluminum in a corroisve enviorment. At some point in time, the magensium anode will be completely gone and need to be replaced. Personally, I would just stick with the all copper rad in the first place.
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