Why can you anodise Aluminium and Magnesium alloys?

Anodizing:

Anodizing is the surface protection process from the environment. As we know that due to external environment surfaces get corrodes. By using anodizing process the outer surface of material coated by using different type of coating material.

As the name stand that in the anodizing process there will be anode and oxygen. in this process oxidation of material take place.

Oxides of aluminium and magnesium are stable that is why they anodized by this process.