One of the principal reasons for choosing aluminium and its alloys for construction applications is their high corrosion resistance. Although aluminium is a chemically very active metal, its behaviour is stabilised by the formation of a protective film of oxide on a recently formed aluminium surface.
Generally, the film is stable in aqueous solutions with pH 4.5-8.5. Further considerations need to be made if the pH exceeds these limits or the environment contains chloride.
Anodising and powder coating are common methods to increase corrosion resistance.
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