Question

Iron coated with paint or grease does not rust

Answer 1

Painting prevents rust by excluding water, electrolytes, and air from the ferrous metal.

Answer 2

Painting prevents rust by excluding water, electrolytes, and air from the ferrous metal.

When metal is coated in oil it forms a protective barrier that stops any external elements from seeping through. This includes water. As H2O is unable to penetrate the metal, the rusting process doesn't start. As well as tangible water, oil also repels the water that's present in oxygen.

Explanation:

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