Question

What are the ways to prevent corrosion ?

Answer 1

Answer:

Metal Type. One simple way to prevent corrosion is to use a corrosion resistant metal such as aluminum or stainless steel. ...

Protective Coatings. The application of a paint coating is a cost-effective way of preventing corrosion. ...

Environmental Measures. ...

Sacrificial Coatings. ...

Corrosion Inhibitors. ...

Design Modification.

Explanation:

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Answer 2

PREVENTION OF CORROSION :-  

Rusting of Iron, and corrosion of other metals can be prevented by not allowing air to come in contact with the metal.  

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Some methods for doing this are ::  

1. Painting or applying oil :  

Painting the surface of the metal after cleaning it thoroughly is the most common way to prevent corrosion. The paint keeps air away from the metal surface. Applying grease or oil on the surface has a similar effect. However, if there is a break in layer of paint, grease or oil, the metal starts corroding at that point.  

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2. Covering with another metal  

Depositing a layer of another metal which is more resistant to corrosion is another commonly used method for prevention of corrosion of metals. The metals mostly used are tin and zinc.  

Covering a metal with another metal can be done in the following ways ::  

• Galvanizing  

Clean iron sheets are dipped in molten zinc to deposit a layer of zinc on it. This process is called galvanization.

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• Electroplating  

The process of electroplating is also used to deposit a metallic layer to prevent corrosion.  Tin is electroplated on Iron to make food containers commonly called tin cans.  Chromium is electroplated on steel furniture and bicycle handles to prevent rusting.

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• Anodizing of aluminium  

A layer of aluminium oxide is formed on aluminium exposure to air. This prevents further corrosion of aluminium. If this layer is made more uniform, it protects the aluminium underneath more effectively. This is done by anodizing. It consists of passing an electric current through sulphuric acid using aluminium as anode.  

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• Alloying  

Some metals become corrosion-resistant when alloyed with other metals.

Example –  

1. Stainless steel with an alloy of iron  
2. Chromium and nickel  

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