If possible it is best to use red brass brazed to copper the threaded onto the metal, adding a third dissimilar metal does not sound like a good idea. the red brass and copper will not react with each other and the metal will act as the anode (if the mass of the anode is much greater you will see very little reaction).
Hobart MIG ER4043 Aluminum Welding Wire — 1-Lb. Spool
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