Aluminum waterproof? - Aluminum rusts. - Really?

Aluminum waterproof? - Aluminum rusts. - Really?
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Aluminum rusty is formed by the combination of aluminum and oxygen to aluminum oxide. Normally this is not a disadvantage because aluminum oxides can protect the aluminum surface from corrosion (different from iron rust). Therefore, there is the process to rush the rusty in aluminium surface called Anodized.

If it's rusty by nature without anodized coating, it's still useful?

: That's right, but it's slow and thin. Rusty on top of aluminum becomes self-precaution, not expanded widely.

Thank you very much krub.

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