Question

what is the name of the process used to coat aluminium with aluminiumoxide ?why is aluminium known as amphoteric oxide?

Answer 1

Answer:

This layer protects the metal from further oxidation. The thickness and properties of this oxide layer can be enhanced using a process called anodising.

A number of alloys, such as aluminium bronzes, exploit this property by including a proportion of aluminium in the alloy to enhance corrosion resistance.

Answer 2

Explanation:

Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell.

Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases, such as hydrofluoric acid and sodium hydroxide, acting as an acid with a base and a base with an acid, neutralising the other and producing a salt.

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