Question

Explain two method by which rusting of iron can be prevented

Answer 1

rust can be prevented by oiling  or painting iron

Answer 2

1. Barrier protection:

In this method, a barrier film is introduced between iron and atmospheric oxygen and moisture. Barrier protection can be achieved by one of the following ways:

By painting the surfaceBy coating the surface with a thin film of oil or grease.By electroplating iron with some non-corrosive metal such as nickel, chromium, copper, etc.

2. Use of anti-rust solutions:

The alkaline phosphate and alkaline chromate solutions act as anti-rust solutions. When iron articles are dipped into a boiling and strongly alkaline solution of sodium phosphate, a protective insoluble film of iron phosphate is formed on them. This film protects the article from rusting.