Why aluminum doesn’t rust？
That is wrong,Aluminum also rusts, but it doesn’t rust away like iron does.Rust is when a metal is oxidized by oxygen in the air. Aluminum reacts with oxygen to form alumina, which is known as aluminum rust.Aluminum rust is very thin, its thickness is only one thousandth of a millimeter, but it is very hard, very wear-resistant.It clings to the surface of the aluminum, keeping the aluminum inside out of contact with the outside air, preventing the aluminum continue to rust.
Why people say aluminum is a flying metal?
The density of aluminum is small, only 2.7g/cm³, the surface of the dense Al₂O₃ film, prevent the internal aluminum reaction, not easy to be oxidized.It is a common material in airplanes. 70% of modern airplanes are made of aluminum and aluminum alloy, so it is called flying metal.
Why aluminum profiles usually have to do surface treatment?
If the aluminum profile not do the surface treatment, the appearance is not beautiful, and it is easy to be corroded in the humid air, so it is difficult to meet the requirements of high decorative of the aluminum profile in building materials. In order to improve the decorative effect, enhance corrosion resistance and prolong the service life, the aluminum profile generally do surface treatment.
If you want to know more about surface treatment, you can contact Shenghai Aluminum.
Why aluminum is expensive than iron?
Although the reserves of aluminum in the earth’s crust are more than that of iron, but the production process of aluminum is much more complicated than that of iron. Aluminum is a relatively active metal element, and smelting needs to go through electrolysis method, which consumes higher cost than that of iron in the whole production process, so the price of aluminum is higher than iron.