Aluminum is an active metal which reacts with oxygen in the air to produce a hard thin film of aluminum oxide on the surface.
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Aluminium oxide iupac name or aluminum oxide american english is a chemical compound of aluminium and oxygen with the chemical formula al 2 o 3 it is the most commonly occurring of several aluminium oxides and specifically identified as aluminium iii oxide it is commonly called alumina and may also be called aloxide aloxite or alundum depending on particular forms or applications.
Usually when aluminum is exposed to air at room temperature the thickness of alumina formed on the surface would be about 3 to 4 angstrom and if it is left longer time the alumina thickness.
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Aluminum plate at anode is oxidized and a thin layer of aluminum oxide is formed on the surface and the thickness thereof is 5 to 20 μm and the hard anodized film is 60 to 200 μm.
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The melting point of aluminum oxide is approximately 3600ºf 1982ºc which is almost three times the melting point of pure aluminum 1220ºf 660ºc.