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What is anodised aluminium ?...

What is anodised aluminium ?

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**Step-by-Step Text Solution:** 1. **Definition of Anodized Aluminium**: Anodized aluminium refers to aluminium that has undergone a specific electrochemical process known as anodizing. 2. **The Anodizing Process**: This process involves depositing an oxide layer on the surface of aluminium through electrolysis. During anodizing, aluminium is immersed in an electrolytic solution and an electric current is passed through it, which leads to the formation of a protective oxide layer. 3. **Benefits of Anodizing**: - **Corrosion Resistance**: Anodizing enhances the corrosion resistance of aluminium, protecting it from environmental factors. ...
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Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Anodised aluminium is.

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