Question

Rusting can be prevented by :

Answer 1

by colouring colouring the object and by protecting it from air and moisture

Answer 2

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.