Corrosion


 
 
Concept Explanation
 

Corrosion

Corrosion: 

When a piece of iron is left in open for sometime, it acquires a film of brownish substance which is called rust. This process of change of iron to rust is called rusting of iron. Rust is different from iron. This rust is iron oxide. The chemical equation of rusting of iron can be represented as :

Iron(Fe)+Oxygen(O_{2})+Water(H_{2}O)rightarrow Rust(iron;oxide,Fe_{2}O_{3})

Prevention of Rusting:

(i) Galvanisation: It is considered as the best method to prevent rusting. It is the process of deposition of a thin layer of zinc on iron surface. It is done to prevent rusting of iron. Rusting can also be prevented by deposition of thin layer of chromium on iron articles. We use galvanised Iron (G.I) pipes to carry water in taps. It is estimated that about 15% of the total world production of iron is destroyed due to rusting.

(ii) Application of coat of paint or grease on the surface of iron also help in prevention of rusting.

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Sample Questions
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Question : 1

The shipping industry has to bear huge financial loss because of rusting of ships. The rusting of ships occur because:

Right Option : D
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Question : 2

For protection of Iron pipes from corrosion they are coated with _________________

Right Option : D
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Explanation
Question : 3

Galvanization is a method to ________________ .

Right Option : A
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Explanation
 
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