What are the common types of corrosion of industrial aluminum

by:Zeyi     2021-04-24
Generally speaking, the basic types of industrial aluminum profile are corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, filiform corrosion, etc. The following briefly introduces these types of corrosion.    一.pitting corrosion     pitting corrosion, also known as pitting corrosion, is a very local corrosion form that produces pinpoints, points, and holes on metal. Aluminum pitting corrosion occurs in the atmosphere, fresh water, and neutral aqueous solutions. In severe cases, it can also lead to 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.    二. Galvanic corrosion      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 its corrosion. Galvanic corrosion is also called bimetallic corrosion. The severity of the corrosion is determined by the relative position of the two metal potential sequences.    3. Crevice Corrosion      crevice corrosion is due to the effect of different gas-filled batteries, which causes the 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. Intergranular corrosion 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 boundary, which is an anode relative to the grains. The battery causes accelerated intergranular corrosion.    5. Filament corrosion      Filament corrosion is a kind of under-film corrosion, which develops under the film in the form of worms. This kind of film can make paint film and other layers, and generally does not occur under the anodic oxide film. ————The article comes from the Internet. If there is any infringement, please contact to delete it.
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