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2. coating with steel.
3.continuously cleaning its surface(not possible at all in our busy life).
4. not allowing it 2 come in contact with air or water
  because iron react with oxygen to produce brown substance named rust
hope i helpd u plz mark as the brainliest

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1)galvanising the metal.
2)painting the metal.
3)greasing or oiling the metal.
5)chromium plating
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