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Aluminum is naturally corrosion resistant and does not break down or degrade with exposure to water, humidity and a salty environment like other metals. It also does not patina like copper or zinc.
The purpose of anodizing is to form a layer of aluminum oxide that will protect the aluminum from corrosion. The aluminum oxide layer has a much higher corrosion and abrasion resistance than the aluminum itself. There are some anodizing processes that produce a porous oxide layer that can be colored with organic dyes or metallic pigments, giving the aluminum a decorative and protective finish.
