Why is aluminum rust?
This question is wrong. Aluminum is also rust, but aluminum is rust and does not keep rust like iron until the rust is over.
The oxygen oxygen in the metal is rust. Aluminum and oxygen have a chemical reaction to generate alumina, which is aluminum rust. The aluminum rust is very thin. Its thickness is only one thousandth of millimeters, but it is very hard and very wear -resistant. It is close to the surface of the aluminum, so that the aluminum inside cannot reach the outside air and prevent the aluminum from continuing to rust. (Tips: Aluminum oxide films also have "nemesis": one is alkali and one is acid. One alumina encounters a chemical reaction when they encounter them, and they are very easy to fall off. The dishes often contain pH, so no! Want! Put the dishes and fruit wine in aluminum utensils to prevent the aluminum pot from rusting damage. In addition, no! Because the surface of the aluminum pot is gray and embarrassed, wipe it with sand, although you wipe a layer of oxidation film, the aluminum pot is brightened, and some of the aluminum pot is brightened. , But this can only make you happy. Lost the surface protective film, the aluminum pot continues to oxidize, and the color of aluminum oxide gray will be displayed in front of your eyes; and the aluminum pot is getting thinner .
Why is aluminum a non -ferrous metal?
Narrow non -ferrous metals, also known as non -iron metals, are collectively referred to all metals other than iron, manganese, and chromium; non -ferrous metals in the broad sense also include non -ferrous alloys (with a non -ferrous metal substrate (usually greater than 50%), add one or one or one or one or one or one or one or Metal composed of several other elements).
Why is aluminum a flying metal?
The density of aluminum is small, only 2.7g/cm³, and the dense Al₂o ₃ film exists on the surface, which prevents the internal aluminum from reaction and is not easy to be oxidized. It is commonly used by aircraft. 70%of modern aircraft are manufactured by aluminum and aluminum alloy, so it is called flying metal.
Why do aluminum profiles generally perform surface treatment?
If the aluminum profile is not treated without surface treatment, the appearance is not beautiful, and it is easy to be corroded in the humid air. And extending the service life, aluminum profiles generally should be treated.
Why is aluminum more expensive than iron?
Although the reserves of aluminum in the crust are more than iron, the production process of aluminum is much more complicated than iron. Aluminum is a more lively metal element. Monographs need to be electrolytic. , So the price of aluminum is higher than iron.
Why use aluminum cans for canned soda?
The aluminum tank has the following advantages: not easy to break; light weight; opaque.
Wang Laoji, Babao porridge, etc. are relatively hard iron cans, because the packaging objects are not pressured, and aluminum cans are easy to deform. The pressure in soda is larger than the normal pressure. Under the action of pressure, don't worry about deformation. And aluminum cans can ensure the pressure of carbon dioxide in soda, so that the soda achieves a better taste effect.
What are the uses of aluminum?
The use of aluminum is tens of millions, but there are mainly the following major purposes in summary:
Aluminum use aerospace is used for aircraft skin, fuselage, beam, rotor, propeller, fuel tank, wall board and landing frame pillar, as well as ships, rockets, spacecraft wall boards, etc. It is widely used in packaging, food, cosmetics, medicines, cigarettes, industrial products and other packaging. Transportation aluminum can provide all kinds of aluminum alloy materials for automotive subway and large porous profiles for vehicles. Large porous profiles are filled with domestic gaps, which meets the localization requirements of subway. Pieces, doors and windows and shelves, car engine parts, air -conditioners, radiator, body plates, wheels and ship materials. The packaging of aluminum -based aluminum can be used to measure a sign of a country's aluminum processing level.
The aluminum is mainly used as a metal packaging material in the form of thin plates and foil, and is made into tanks, lids, bottles, barrels, and packaging foil. The printing industry for printing bid farewell to the "lead and fire" and entered the era of "light and electricity" ... The aluminum -based PS version provides strong support for this change in the printing industry. Electronic appliance aluminum is mainly used in various businesses, wires, conductors, electrical components, refrigerators, cables and other fields. The air -conditioner has excellent deep -shaped performance, high strength, and good extension to reach the level of imported similar products; high -performance electrolytic capacitors foil fills domestic gaps. Due to good corrosion resistance, sufficient strength, excellent craftsmanship and welding performance for building decoration for building decoration, it is widely used in building frames, doors and windows, ceilings, decorative surfaces, etc.
