Aluminum will corrode with the best of them. Depends on conditions of course, but to say alloy won't is inaccurate. Here is a set of bars that came on my Colnago, and had what I presume was original, or very old hand stitched leather covers.
Note the deep pitting just under where the brake clamp was mounted. It goes nearly all the way through the tubing wall. There are several pits just pike that all over these bars. I replaced them immediately with brand new 66's.