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Aluminium Products

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Chemical of aluminium

Corrosion resistance can be excellent due to a thin surface layer of aluminium oxide that forms when the metal is exposed to air, effectively preventing further oxidation. The strongest aluminium alloys are less corrosion resistant due to galvanic reactions with alloyed copper.[7] This corrosion resistance is also often greatly reduced by aqueous salts, particularly in the presence of dissimilar metals.

Owing to its resistance to corrosion, aluminium is one of the few metals that retain silvery reflectance in finely powdered form, making it an important component of silver-colored paints. Aluminium mirror finish has the highest reflectance of any metal in the 200C400 nm (UV) and the 3,000C10,000 nm (far IR) regions; in the 400C700 nm visible range it is slightly outperformed by tin and silver and in the 700C3000 (near IR) by silver, gold, and copper.[10]

Aluminium is oxidized by water to produce hydrogen and heat:

2 Al + 3 H2O Al2O3 + 3 H2

This conversion is of interest for the production of hydrogen. Challenges include circumventing the formed oxide layer which inhibits the reaction and the expenses associated with the storage of energy by regeneration of the Al metal.[11]