Engaged In Aluminum Processing Industry, These Basic Knowledge Must Be Mastered

1. Why doesn't aluminum rust?
That's the wrong question. Aluminum rusts, too, but it doesn't rust like iron until it's gone. Metal is rusted when oxidized by oxygen in the air. Aluminum reacts with oxygen to form aluminum oxide, which is aluminum rust. Aluminum rust is very thin; its thickness is only one millionth of a millimeter, but it is very hard and very wear-resistant. It is close to the surface of the aluminum, so that the aluminum inside can not contact the outside air, preventing the aluminum from continuing to rust.

2. Why is aluminum a non-ferrous metal?

The narrow sense of non-ferrous metals, also known as non-ferrous metals, is a general term for all metals other than iron, manganese, and chromium. The generalized non-ferrous metals also include non-ferrous alloys (alloys consisting of a non-ferrous metal as a matrix (usually greater than 50%) and adding one or more other elements).

3. Why is aluminum a flying metal?

The density of aluminum is small, only 2.7g/cm³, and there is a dense Al₂O₃ thin film on the surface, which prevents the internal aluminum from reacting and makes it easy to oxidize. It is a commonly used material for aircraft, and 70% of modern aircraft are made of aluminum and aluminum alloys, so it is called flying metal.

4. Why is aluminum trivalent?

In simple terms, aluminum's electron configuration is 2,8,3. Since the outermost electron shell is not full, the structure is unstable, and the three valence electrons are easily lost; therefore, aluminum is often trivalent. However, the three electrons of aluminum are more stable than the single outermost electron of sodium and the two outermost electrons of magnesium, which is why aluminum is less reactive than sodium and magnesium.

5. Why should aluminum profiles generally be surface-treated?

If the aluminum profile is not surface treated, 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 and strong weather resistance of aluminum profiles in building materials, to improve the decorative effect, enhance corrosion resistance and extend the service life, aluminum profiles are generally surface treated.

6. Why is aluminum more expensive than iron?

Although the reserves of aluminum in the earth's crust are more than those of iron, the production process of aluminum is more complex than iron, aluminum is a more active metal element, and smelting requires the electrolysis method, the cost of consumption in the entire production process is higher than that of iron, so the price of aluminum is higher than that of iron.

7. Why use aluminum cans for soda cans?

Aluminum cans have the following advantages: not easy to break; lightweight; Opaque to light. Wang Lao Ji, eight treasure porridge, etc., are relatively hard iron cans, because the package is not under pressure, and it is easy to deform with aluminum cans. The pressure inside the soda is larger than the normal pressure, and under the action of pressure, there is no need to worry about deformation. And the aluminum can ensure the pressure of carbon dioxide in the soda, so that the soda can achieve a better taste.

8. What are the uses of aluminum?

Aluminum has thousands of uses, but it has the following main uses:
Aerospace aluminum is used to make aircraft skins, fuselage frames, girders, rotors, propellers, mailboxes, wall panels, and landing gear struts, as well as rocket forging rings, spacecraft wall panels, etc. Widely used in beverages, food, cosmetics, pharmaceuticals, cigarettes, industrial products, and other packaging. Aluminum for transportation can provide all kinds of aluminum alloy materials for automobiles in a full range of subway, light rail with large porous profiles to fill the domestic gap, to meet the requirements of subway localization for the manufacture of automobiles, subway vehicles, railway buses, high-speed bus body structural parts, car doors and Windows and shelves, automobile engine parts, air conditioners, radiators, body panels, wheels and ship materials. The packaging aluminum can material is a measure of a country's aluminum processing level.

Aluminum is mainly used as a metal packaging material in the form of sheet and foil, which are made into cans, caps, bottles, drums, and packaging foils. Printing with the aluminum printing industry bid farewell to "lead and fire", into the era of "light and electricity"... The aluminum-based PS plate provides strong support for this change in the printing industry. Aluminum for electronic home appliances is mainly used in various bus, wire, conductor, electrical components, refrigerator, cable, and other fields. The aluminum foil for air conditioners has excellent deep-drawing performance, high strength, and good extensibility, reaching the level of imported similar products. High-performance electrolytic capacitor foil fills the domestic gap. Aluminum alloy for architectural decoration because of good corrosion resistance, sufficient strength, excellent process performance and welding performance, widely used in building frames, doors and Windows, ceiling, decorative surfaces, and so on.