Several Knowledge about Aluminum

Several Knowledge about #aluminum

Why doesn't aluminum rust?

This question is wrong. Aluminum also rusts, but aluminum does not rust like iron until it is completely rusted.

Metal is oxidized by oxygen in the air to rust. Aluminum undergoes a chemical reaction with oxygen to produce aluminum oxide, which is known as aluminum rust. Aluminum rust is very thin, with a thickness of only one thousandth of a millimeter, but it is very hard and very wear-resistant. It adheres closely to the surface of aluminum, preventing the aluminum inside from coming into contact with the outside air and preventing it from further rusting.

(Tip: Aluminum oxide film also has a "nemesis" One is alkali, and the other is acid. When aluminum oxide encounters them, it undergoes a chemical reaction, generating compounds that are easily detached. Dishes often contain acidic and alkaline components, so no! Yes! Place the dishes and wine in an aluminum container to prevent the aluminum pot from rusting and damaging. Besides, no! Yes! Because the surface of the aluminum pot is gray and difficult to clean, you can use sand to wipe it. Although you wipe a layer of oxide film and the aluminum pot brightens up a bit, it 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 alumina will still appear in front of you; And the aluminum pot is getting thinner, which affects its service life

Why is aluminum a non-ferrous metal?

Narrowly defined non ferrous metals, also known as non ferrous metals, are a collective term for all metals except iron, manganese, and chromium; Broadly speaking, non-ferrous metals also include non-ferrous alloys (alloys formed by adding one or several other elements to a non-ferrous metal matrix (usually greater than 50%)).

Why is aluminum a flying metal?

Aluminum has a low density of only 2.7g/cm 3， There is a dense Al ? O ? film on the surface, which prevents the internal aluminum from reacting and is not easily oxidized. It is a commonly used material for airplanes, and 70% of modern airplanes are made of aluminum and aluminum alloys, so it is called flying metal.

Why is aluminum trivalent?

Simply put, the arrangement of electrons outside aluminum atoms is 2,8,3.

The number of outermost electrons is not sufficient, the structure is unstable, and three electrons are easily lost, so they often appear positively trivalent. However, it is obvious that three electrons are more stable than one electron in the outermost layer and two electrons in the outermost layer of magnesium, so aluminum is not as active as sodium and magnesium.

Why do aluminum profiles generally require surface treatment?

Aluminum profiles without surface treatment have an unattractive appearance and are prone to corrosion in humid air, making it difficult to meet the requirements for high decorative and strong weather resistance of aluminum profiles in building materials. In order to improve decorative effects, enhance corrosion resistance, and extend service life, aluminum profiles generally require surface treatment.

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 relatively active metal element, and smelting requires electrolysis. The cost consumed throughout the production process is higher than that of iron, so the price of aluminum is higher than that of iron.

Why do soda cans use aluminum cans?

Aluminum cans have the following advantages: they are not easily broken; Lightweight; Not translucent.

Wang Laoji, Babao Congee, etc. are made of hard iron cans, because the packaging materials have no pressure, and aluminum cans are easy to deform. The pressure inside the soda is higher than normal, so there is no need to worry about deformation under the pressure. And aluminum cans can ensure the pressure of carbon dioxide in the soda, allowing the soda to achieve a better taste effect.

What are the uses of aluminum?

Aluminum has millions of uses, but in summary, it mainly has the following major uses:

Aluminum materials are used in aviation and aerospace to make aircraft skins, fuselage frames, beams, rotors, propellers, fuel tanks, wall panels, and landing gear pillars, as well as for ships, rocket rings, spacecraft wall panels, etc. Widely used for packaging beverages, food, cosmetics, pharmaceuticals, cigarettes, industrial products, etc. Aluminum materials for transportation can comprehensively provide various types of aluminum alloy materials for automobiles. Large porous profiles for subways and light rails fill the domestic gap, meeting the localization requirements of subways. They are used for manufacturing automotive, subway vehicles, railway passenger cars, high-speed passenger car body structural components, doors, windows, and cargo racks, automotive engine parts, air conditioners, radiators, body panels, wheel hubs, and ship materials. The packaging material for all aluminum cans is a symbol of a country's aluminum processing level.

Aluminum materials are mainly used as metal packaging materials in the form of thin sheets and foils, making cans, caps, bottles, barrels, and packaging foils. The aluminum printing industry has bid farewell to the era of "lead and fire" and entered the era of "light and electricity"... Aluminum based PS plates have provided strong support for this transformation in the printing industry. Aluminum materials for electronic appliances are mainly used in various fields such as busbars, wiring, conductors, electrical components, refrigerators, cables, etc. 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 blank. Aluminum alloy for architectural decoration is widely used in building frames, doors and windows, suspended ceilings, decorative surfaces, etc. due to its excellent corrosion resistance, sufficient strength, excellent process performance, and welding performance.

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