2.35 describe how the rusting of iron may be prevented by grease, oil, paint, plastic and galvanising

Grease, oil, paint and plastic are called “barrier methods”.  They stop air and water from accessing the iron.  Remember a good example of each method, e.g., grease for axles on cars, oil for a bicycle chain, paint for iron railings and plastic for the shelves in a fridge.

Galvanising involves covering the iron completely with zinc.  This is a form of “sacrificial protection” as well.  It is suitable for smaller objects, e.g., car bodies, buckets and nails.  See the next Section 2.36.