Some little knowledge about aluminum

Views:484 Author:Site Editor Publish Time:2022-05-24 09:24:12 Orgin:Site

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01· Why is aluminum a flying metal?

The density of aluminum is small, only 2.7g/cm ³, There is a dense Al2O3 film on the surface, which prevents the internal aluminum from reacting and is not easy to be oxidized. It is a commonly used material for aircraft. 70% of modern aircraft are made of aluminum and aluminum alloy, so it is called flying metal.

02·Why is aluminum trivalent?

In short, the arrangement of electrons outside aluminum atoms is 2,8,3.

The number of electrons in the outermost layer is not enough, and the structure is unstable. Three electrons are easy to lose, so they are often positive trivalent. However, it is obvious that three electrons are more stable than one electron in the outermost layer of sodium and two electrons in the outermost layer of magnesium, so aluminum is not as active as sodium and magnesium.

03·Why do aluminum profiles generally need surface treatment?

Without surface treatment, the appearance of aluminum profile is not beautiful, and it is easy to be corroded in humid air. In this way, it is difficult to meet the requirements of high decoration and strong weather resistance of aluminum profile in building materials. In order to improve the decoration effect, enhance the corrosion resistance and prolong the service life, aluminum profile generally needs surface treatment.

04·Why is aluminum more expensive than iron?

。Although aluminum has more reserves in the earth's crust than iron, the production process of aluminum is much more complex than iron. Aluminum is a more active metal element. Smelting needs to be carried out by electrolytic method. The cost consumed in the whole production process is higher than that of iron, so the price of aluminum is higher than that of iron.

04·Why do soda cans use aluminum cans?

Aluminum cans have the following advantages: they are not easy to break; Light weight; Opaque.

Wang Laoji and Babao porridge are made of relatively hard iron cans because there is no pressure on the packaging, and it is easy to deform with aluminum cans. And soda pressure is higher than normal pressure. Under the action of pressure, don't worry about deformation. Moreover, the aluminum can ensure the pressure of carbon dioxide in the soda, so that the soda can achieve better taste effect.

05·What are the uses of aluminum?

Aluminum has tens of millions of uses, but it can be summarized into the following major uses:

Purpose of aluminum material:

1. Aerospace is used to make aircraft skin, fuselage frame, girder, rotor, propeller, oil tank, wall plate and landing gear strut, as well as ship, rocket forged ring, spacecraft wall plate, etc.

2. It is widely used in the packaging of beverages, food, cosmetics, drugs, cigarettes, industrial products, etc. 

3. Aluminum materials for transportation can provide all kinds of aluminum alloy materials for automobiles in an all-round way. Large porous profiles for Metro and light rail fill the gap in China and meet the requirements of Metro localization. They are used to manufacture body structural parts, doors, windows and shelves, automobile engine parts, air conditioners, radiators, body panels, wheel hubs and materials for ships of automobiles, metro vehicles, railway passenger cars and high-speed passenger cars.

4. The can making material of all aluminum cans for packaging is a sign to measure the aluminum processing level of a country. Aluminum is mainly used as metal packaging material in the form of sheet and foil to make cans, covers, bottles, barrels and packaging foil.

5.Aluminum for printing makes the printing industry bid farewell to "lead and fire" and enter the era of "light and electricity". Aluminum based PS plate provides strong support for this change in the printing industry.

6.Aluminum materials for electronic appliances are mainly used in various fields such as buses, stringing, conductors, electrical components, refrigerators, cables and so on. Aluminum foil for air conditioner has excellent deep drawing performance, high strength and good extensibility, reaching the level of imported similar products; High performance electrolytic capacitor foil fills the gap in China.

7.Aluminum materials and aluminum alloys for building decoration are widely used in building frame, doors and windows, ceiling, decorative surface, etc. because of their good corrosion resistance, sufficient strength, excellent process performance and welding performance.

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