Aluminum is slowly accumulated in the human body, and its toxicity is slow and imperceptible. But once the toxic reaction of metabolic disorder occurs, the consequences are very serious. Therefore, we must pay attention to prevent the absorption of aluminum and reduce the use of aluminum products in daily life.
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Main uses of aluminum:
1, the density of aluminum is very small, only 2.7 g/cm. Although soft, it can be made into various aluminum alloys, such as hard aluminum, ultra-hard aluminum, rust-proof aluminum, cast aluminum and so on. These aluminum alloys are widely used in aircraft, automobiles, trains, ships and other manufacturing industries.
2. The conductivity of aluminum is second only to silver, copper and gold. Although its conductivity is only 2/3 of that of copper, its density is only13 of that of copper, so the quality of aluminum wire is only half that of copper wire. The oxide film on aluminum surface not only has corrosion resistance, but also has certain insulation.
Aluminum is a good conductor of heat. Its thermal conductivity is three times that of iron. Aluminum can be used in industrial production of various heat exchangers, radiators and cookers.
4. Aluminum has good ductility (ductility is second only to gold and silver). 100 ~ 150 can make aluminum foil with thickness less than 0.01mm. These aluminum foils are widely used in the packaging of cigarettes, sweets and so on. , can also be made into aluminum wire and aluminum strip, and can be rolled into various aluminum products.
5. There is a dense oxide protective film on the aluminum surface, which is not easy to be corroded. It is often used to manufacture chemical reactors, medical instruments, refrigeration equipment, oil refining equipment, oil and gas pipelines, etc.
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