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

These all create a 'barrier' around the iron, stopping water and/or oxygen from reaching it.

Paint/plastic can also be decorative and can be used on big or small structures (its versatile) and can be decorative (:

Grease/oil can only be used on moving parts e.g. bike chains