Question

Painting a metal prevents it form corroding. Why?

Answer 1

Corrosion can be prevented by removing one of these conditions. Coating a metal surface with paint or enamel provides a barrier between the metal and the moisture in the environment. The process of coating a metal surface with another metal that is more likely to be oxidized is referred to as sacrificial coating.

Answer 2

Painting a metal prevents moisture from reaching the surface of the steel. A coating film protects underlying metal substrates in three ways: Coatings can slow the rate of diffusion of water and oxygen from the environment to the metal surface. This slows the corrosion process.

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