Question

why aluminium loose its structure very quickly

Answer 1

Thank you for the question!
Aluminium vessels loses its shine after frequent uses. This is because when aluminium is expose to air frequently,it reacts with the oxygen present in the air and forms aluminium oxide. Due to the formation of aluminium oxide the luster and shine of the vessel diminishes.
Hope it helps. 

Answer 2

Aluminium is a semi-metal so that's why it looses its structure very quickly.

And it also gets oxidized very soon.