Corrosion and its Prevention


 
 
Concept Explanation
 

Corrosion and its Prevention

Corrosion:

Iron and many other metals react with oxygen and moisture present in the atmosphere. This phenomenon is called corrosion. The process of slow eating away of a metal due to the attack of atmospheric gases and moisture on its surface is called corrosion.

•  Iron reacts with oxygen and moisture present in the atmosphere to form a brown, flaky substance called rust. Rusting of iron in an undesirable reaction because the layer of rust formed falls off, exposing the metal to further rusting.

4Fe + 3O_2 + 3H_2O rightarrow Fe_2O_3 + 2Fe(OH)_2

Prevention of rusting:

Both air and water are needed together to rust the iron. The only way to prevent iron from rusting is to keep air and water away from it. It can be done by:

  • By painting,
  • By oiling and greasing,
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    Sample Questions
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    Question : 1

    This metal's latin name is "Ferrum" and it is a magnetic, malleable and silvery-white metal. It was used to make ornaments and weapons. When exposed to moist air, it oxidises to from rust. Identify the metal.

    Right Option : A
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    Question : 2

    Which of the following elements undergoes rusting ?

    Right Option : A
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    Question : 3

    Rusting of iron requires the presence of ________________

    Right Option : A
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