Various properties of aluminum makes it widely used in Industrial Profile Systems, the most popular application is industrial aluminum profile</a> which attaches high importance to its hardness and machinability. And what other properties does aluminum have?
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1. Corrosion Resistance
Aluminum has about one-third the density and stiffness of steel with only 2.7g\cm3, which in most conditions including air, water, petroleum chemistry and many chemical systems, aluminum can also be excellent in corrosion resistance, due to a thin surface layer of aluminum oxide that forms when the metal is exposed to air, effectively preventing further oxidation. And owing to this feature, aluminum is one of the few metals that retain silvery reflectance in finely powdered form, making it an important component of silver-colored paints.
2. Reflectivity
The surface of aluminum is highly reflective. Visible light, radiant heat and electric waves can be effectively reflected by aluminum. And the surface of the anodic oxidation and dark anodic oxidation can be both reflective and absorptive. Polished aluminum is excellent in reflectivity over a wide wavelength, thus it is used for many decorative purposes.
3. Thermal Conductivity and Electrical Conductivity
Aluminum is a good thermal and electrical conductor, having 59% the conductivity of copper, both thermal and electrical, while having only 30% of copper's density. Aluminum is capable of being a superconductor, with a superconducting critical temperature of 1.2 Kelvin and a critical magnetic field of about 100 gauss. The features are favorable in manufacturing heat exchanger, evaporator, heating appliances, cooking utensils, as well as the automobile cylinder head and radiator.
Aluminum is widely used in all kinds of buildings, such as tower, storage tank and so on. Although the cost for structural steel in infrastructure investment is low, when people are considering the structural characteristics, unique architectural engineering design, light weight and corrosion resistance, aluminum is adopted. Aluminum is almost always alloyed, which markedly improves its mechanical properties, especially when tempered. The strength and durability of aluminum alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminum a bad reputation.
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