Question

write down Prevention of corrosion
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Answer 1

*By surface coating

You can prevent the corrosion of the metal by coating their surface using any of the following:

1)By applying oil, grease, paint or varnish on the surface.

2)By coating/depositing a thin layer of any other metal which does not corrode.

For instance, you can prevent the surface of iron from corrosion by depositing a thin layer of chromium, zinc or nickel on it. Similarly, brass or copper can be protected by coating it with a thin layer of tin. In our country, tinning of brass is a very common practice.

*By connecting metal to a more electropositive metal

You can also prevent by connecting the metal to a more electropositive metal. As long as the more electropositive metal is present, the given metal will not get corroded. For instance, you can protect iron from corrosion by connecting it to a block/plate of zinc or magnesium. This method of protection is known as cathodic protection.

*By forming insoluble phosphate or chromate coating

The third method of prevention is by treating the metal surfaces with phosphoric acid. It forms an insoluble phosphate coating on the surface which protects the metal from corrosion. You can also form a thin chromate layer to prevent the metals from corrosion.

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