Aluminium oxide is chargeable for resistance of metallic aluminium to weathering. Metallic aluminium is quite reactive with atmospheric oxygen, and a skinny passivation layer of alumina (4 nm thickness) kinds in about one hundred picoseconds on any exposed aluminium floor.[5] This layer shields the metal from even further oxidation. The https://polishingpowder10976.blogozz.com/33952039/facts-about-diamond-wheel-revealed