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[–] 1 point 3 days ago* (5 children)

Oxidises and creates a hard layer so the aluminium doesn't leach or react with acids.

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  • [–] 1 point 3 days ago (3 children)

    Wouldn't oxygen in the air oxidize aluminum and create that layer regardless?

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  • [–] 1 point 3 days ago (2 children)