Question

Give three methods by which rusting can be prevented.

Answer 1

Corrosion of iron is called rusting. Three methods by which rusting can be prevented are mentioned below:

1. Applying a layer of paint, oil or grease prevents the contact of air and moisture with the metal surface, thereby preventing rusting of iron objects. Therefore, iron objects like grills, railings, pipes, bridges, railway coaches, buses, cars, trucks, etc. are usually painted.

2. Electroplating is another method used to prevent iron from rusting. In electroplating, a thin layer of one metal is coated over another metal with the help of electricity. Using this method, iron can be covered with a thin layer of chromium or tin. Iron coated with tin (non-reactive metal) is used to make food storage cans. Iron coated with chromium is used to make taps, kettles, car bumpers, etc.

3. Galvanisation is the process of coating a thin layer of zinc over iron to prevent it from rusting. The iron objects are dipped in molten zinc to get them covered with a thin layer of zinc. Iron sheets, dustbins etc., are galvanised to prevent corrosion of iron.