Aluminum has a wide range of applications in life. Compared with other types of materials, it has several characteristics that make it occupy a pivotal position in various major industries. Compared with steel materials, it is lighter and stronger than copper. Compared with iron, which has corrosion resistance characteristics, these characteristics make aluminum
have a wide range of practicability in the construction industry and the automobile industry. Aluminum can be recycled and reused, and it fully reflects the environmental protection theme in today's era, especially its corrosion resistance characteristics reduce its consumption. Then, in the end, which industrial profiles in aluminum have corrosion resistance Profiles, the editor tells everyone: Usually industrial profiles have filiform corrosion, intergranular corrosion, crevice corrosion, galvanic corrosion and pitting corrosion and other types of aluminum corrosion. The following are the more common types of corrosion of industrial aluminum profile
. 1. Filament corrosion is a kind of corrosion under the film, which develops under the film in the form of worms. This film can make paint film or other layers. Generally, it does not occur under the anodic oxide film. 2. Intergranular corrosion means that pure aluminum does not prosper intergranular corrosion. The cause of intergranular corrosion is related to improper heat treatment. Alloying elements or intermetallic compounds precipitate along the grain boundaries. Compared with the crystal grains, the anode constitutes a corrosion battery, causing The intergranular corrosion accelerates. 3. Crevice corrosion is due to the effect of different gas-filled batteries, which causes corrosion in the crevice to accelerate, but there is no effect outside the crevice. Crevice corrosion has little to do with the type of alloy, even very corrosion-resistant alloys will produce crevice corrosion. In recent years, there has been more in-depth research on the mechanism of crevice corrosion. The acidic environment at the top of the crevice is the driving force of corrosion. 4. Galvanic corrosion is also a characteristic corrosion form of aluminum. The natural potential of aluminum is very negative. When aluminum is in contact with other metals, aluminum is always at the anode to accelerate the corrosion. 5. Galvanic corrosion is also called bimetallic corrosion. The severity of the corrosion is determined by the relative position of the two metal potential sequences. 6. Pitting corrosion is also called pore corrosion, which is an extremely local corrosion form that produces pinpoints, points, and holes on the metal. Aluminum pitting corrosion occurs in the atmosphere, fresh water, and neutral aqueous solutions. In severe cases, it can cause perforation, but the corrosion hole may eventually stop developing, and the amount of corrosion remains at a limit value. Pitting corrosion is a unique form of anode reaction and is an autocatalytic process. The same types of industrial profiles are the use of electrolyte reaction to precipitate crystals, the purpose is the same but the general method is different. I don’t know if you know the anti-corrosion properties of aluminum.
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