AO has various meanings in the Engineering category. Discover the full forms, definitions, and usage contexts of AO in Engineering.
A chemical compound of aluminum with oxygen, which forms immediately on an unprotected surface exposed to air. Unlike iron oxide, (the rust that forms on steel) aluminum oxide does not flake off, but forms a protective layer that blocks further oxidation and so protects the integrity of the metal. It is transparent and does not alter the appearance of the aluminum surface.
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