Question
Anodizing.
✓
Answer
- A protective layer is formed naturally on the surface of aluminium metal by reaction with oxygen in air.
- In the anodizing process, this layer can be made of the desired thickness.
- Anodizing is done by electrolysis.
- Dilute sulphuric acid is taken in the electrolytic cell and the aluminium article is dipped in it as the anode.
- When an electric current is passed, hydrogen gas is released at the cathode and oxygen gas at the anode.
- A reaction with oxygen occurs and a layer of hydrated aluminium oxide is formed on the anode, i.e. the aluminium article.
- This layer can be made attractive by adding colour in the cell during electrolysis.
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