ã€China Aluminum Network】 In general, the basic types of industrial aluminum aluminum corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, filament corrosion. The following briefly describes these types of corrosion.
1. Point corrosion corrosion, also known as hole corrosion, is an extremely localized form of corrosion on the metal that produces needlepoints, dots, and holes. Aluminum can cause pitting in the atmosphere, fresh water, and neutral aqueous solutions. Severely, it can also cause perforation. However, the corrosion hole may eventually stop developing, and the amount of corrosion remains at a limit. Pit corrosion is a unique form of anode reaction and is an autocatalytic process.
2. Galvanic corrosion Galvanic corrosion is also a characteristic corrosion pattern 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 corrosion. Galvanic corrosion, also called bimetallic corrosion, is determined by the relative position of two metal potential sequences.
3. Crevice Corrosion Crevice corrosion is the result of the differential gas-filled battery, resulting in accelerated corrosion within the crevice, with no effect outside the crevice. Crevice corrosion has little to do with the type of alloy. Even very corrosion resistant alloys can produce crevice corrosion. In recent years, the mechanism of crevice corrosion has been further studied, and the acid environment at the top of the gap is the driving force of corrosion.
IV. Intergranular corrosion Intergranular corrosion refers to the fact that pure aluminum does not produce intergranular corrosion. Intergranular corrosion is related to improper heat treatment. Alloying elements or intermetallic compounds precipitate along the grain boundaries and form corrosion with respect to the grains. The battery causes accelerated intergranular corrosion.
5. Filament corrosion Filament corrosion is a kind of corrosion under the film and it develops in the form of worms under the film. This kind of film can make the paint film, and it can also make other layers, generally does not occur under the anodized film.
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