4 Answers
Iron articles are painted because it prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off. Hence, rusting is prevented their presence is essential for rusting to take place.
Paint forms a protective coating on the surface of iron. Then oxygen and moisture present in the air cannot have a direct contact with the metal. Therefore, surface gets protected against rusting.
When an iron article remains exposed to moist air for a long time, its surface is covered with a brown, flaky (non-sticky) substance called rust.
To prevent rusting. iron articles are not allowed to come in contact with the damp air. This can be done by painting the iron articles.
We apply paint on iron articles because when iron comes in contact with air, moisture, it is coated with a reddish brown powder when left for some time. This is known as rusting of iron.