Question

When does the iron rust and how can it be prevented?​

Answer 1

Answer:

The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.