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Rusting is the corrosion of the metal iron in presence of water and air. Salts may speed up the process.
It can be prevented by painting, sacrificial protection, galvanising or coating etc.
Sacrificial protection is the attaching of a more reactive metal with iron so it corrodes instead of iron, preventing rusting.
Recycling of metals is an essential process which conserves energy and resources, but is expensive and time-consuming.
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