What is corrosion? Write about various techniques in detail prevent from corrosion.
Answers
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Explanation:
You must have noticed that some objects made of iron are covered with some orange or reddish-brown coloured layer at some point in time. The formation of this layer is the result of a chemical process known as rusting, which is a form of corrosion.
There are various methods to prevent corrosion. These include,
1. Electroplating
It is the process by which a metal (I) is coated with a thin layer of another metal (II) using electrolysis. In this way, the new metal coating protects the metal (I) from corrosion.
2. Cathodic Protection
In this process, the base metal is connected to a sacrificial metal that corrodes instead of the base metal. By doing so this sacrificial metal (which is more reactive than the base metal) will give out electrons and get oxidised. The ions thus formed takes part in the corrosion reactions thereby saving the base metal.
3. Galvanization
This process involves coating iron with a thin layer of zinc. It is generally done by dipping iron in molten zinc. The zinc layer coating thus protect the iron inside from corrosion
4. Painting and Greasing
Providing a layer of paint or grease on the metal can prevent the exposure of the metal with the external environment thereby preventing corrosion.
5. Choosing the right material can also help prevent corrosion. Eg: Aluminium and stainless steel are highly corrosion resistant
6. Using corrosion Inhibitor
Corrosion inhibitors are chemicals which when added to the corrosion environment has the ability to cut down the rate of corrosion.