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Coke cans or many other canned beverages are housed in cans made primarily of aluminum. As aluminum is remarkable for its ability to resist to corrosion or rusting (due to the phenomenon of passivation) and its low density, the rusting process is extremely long. Additionally, corrosion resistance can be excellent due to a thin surface layer of aluminum oxide that forms when the metal is exposed to air, effectively preventing further oxidation. This corrosion resistance is also often greatly reduced when many aqueous salts are present in the environment however. Hence rusting is generally only feasible when a can has been exposed to a wet and harsh environment for extended periods of time.

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