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PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoMethods of preventing corrosion: (i). Alloying:
Metals can be alloyed to prevent the corrosion process.
Example:
Stainless Steel
(ii). Surface coating:
![shutterstock_768849040.jpg](https://resources.cdn.yaclass.in/6d1d053d-4e0a-4f4e-bbb9-06e2e81698a0/shutterstock768849040w300.jpg)
Surface coating process
Surface coating involves the application of a protective layer over the metal. It is classified as follows.
(a). Galvanization:
Galvanization is a method of coating zinc on iron sheets by using an electric current.
![shutterstock_1517600279.jpg](https://resources.cdn.yaclass.in/62326f96-6508-415a-b0af-0135c4d45b3f/shutterstock1517600279w300.jpg)
Industrial galvanization process
(b). Electroplating:
Electroplating is a technique of coating one metal over another metal by passing an electric current.
![shutterstock_1504853519.png](https://resources.cdn.yaclass.in/c07a9254-9529-45cc-b311-d2843c256b2a/shutterstock1504853519w300.png)
Copper electroplating technique
(c). Anodizing:
Anodizing is an electrochemical method that turns the metal surface into decorative, durable and corrosion-resistant. Aluminium is widely used for the anodizing process.
![shutterstock_1159956469.jpg](https://resources.cdn.yaclass.in/9021f484-d1ed-4782-a3e6-2bde71c6b682/shutterstock1159956469w300.jpg)
Aluminium anodizing process
(d). Cathodic protection:
Cathodic protection is a process of controlling corrosion of a protected metal surface coated with easily corrodible metal. The easily corrodible metal is called sacrificial metal, which acts as an anode, ensuring cathodic protection.
![1_1.png](https://resources.cdn.yaclass.in/ef49beba-9b3d-47c4-b128-675b158c02d4/11w400.png)
Steel cathodic protection process