The thing about aluminum corrosion is that once a layer of aluminum oxide forms, it seals the surface and the corrosion stops (aluminum oxide is an oxygen barrier, unlike iron oxide)
It may protect it some, but not like copper. I have seen aluminum parts 1/4 inch thick corrode right through, the coating did not prevent this. You are thinking of anodizing and that is not the same form of coating as the white aluminum oxide. With sea salt aluminum will corrode fast, much faster than steel will rust.