Why doesn't aluminium rust?
Apr 28, 2022
The oxidation of metal by oxygen in the air is rust. Aluminum reacts chemically with oxygen to form aluminum oxide, which is aluminum rust. Aluminum rust is very thin, its thickness is only ten thousandths of a millimeter, but it is very hard and very wear-resistant. It clings to the surface of the aluminum so that the aluminum inside is not exposed to the outside air, preventing the aluminum from continuing to rust.
(Tip: Alumina film also has "nemesis": one is alkali and the other is acid. When alumina encounters them, they will react chemically, forming compounds that are very easy to fall off. Dishes often contain acid and alkali components, so no! Yes! Put the dishes and fruit wine in aluminum utensils to avoid corrosion and damage to the aluminum pot. In addition, no! Yes! Because the surface of the aluminum pot is gray and embarrassing, use sand to wipe it, although you wipe a layer of oxide film, the aluminum pot is brighter But this can only make you happy for a while. Without the protective film on the surface, the aluminum pot will continue to oxidize, and the gray color of the aluminum oxide will still show in front of your eyes; and the aluminum pot is getting thinner and thinner, which affects its service life. )