<Li> Pieces are cleaned chemically / mechanically and blocked to minimize oxidation losses when melted . (The surface of aluminium readily oxidizes back into aluminium oxide when exposed to oxygen .) </Li> <Li> Blocks are loaded into the furnace and heated to 750 ° C ± 100 ° C to produce molten aluminium . </Li> <Li> Dross is removed, and the dissolved hydrogen is degassed . (Molten aluminium readily disassociates hydrogen from water vapor and hydrocarbon contaminants .) This is typically done with chlorine and nitrogen gas . Hexachloroethane tablets are normally used as the source for chlorine . Ammonium perchlorate can also be used, as it decomposes mainly into chlorine, nitrogen, and oxygen when heated . </Li> <Li> Samples are taken for spectroscopic analysis . Depending on the final product desired, high - purity aluminium, copper, zinc, manganese, silicon, and / or magnesium is added to alter the molten composition to the proper alloy specification . The top - five aluminium alloys produced are 6061, 7075, 1100, 6063, and 2024 . </Li>

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