1.

Give a scientific explanation:The aluminium article is used as an anode in the anodising process.

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 is 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. Therefore, aluminium article is used as an anode in the anodizing process.


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