Types and characteristics of aluminum alloy corrosion of commonly used industrial aluminum profiles

by:Zeyi     2022-01-24
Generally speaking, the basic types of industrial aluminum profile profile aluminum and aluminum alloy corrosion: pitting corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, stress corrosion, exfoliation corrosion, fatigue corrosion, filiform corrosion, etc., here, only concentrated aluminum The common corrosion phenomenon in the production and use of construction industrial aluminum profiles. Pitting corrosion, also known as pitting corrosion, is a very local form of corrosion that produces pinpoints, points, and holes on metal. Pitting corrosion is a unique form of anode reaction and is an autocatalytic process. 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 pores may eventually stop developing, and the amount of corrosion remains at a limit value. Pitting corrosion is related to the medium alloy in the extreme degree, such as chloride ion, fluoride ion and so on. There must also be substances that promote the cathode reaction, such as dissolved oxygen and copper ions in the aqueous solution. From the perspective of the size of industrial aluminum profiles, high-purity aluminum profiles are generally difficult to pitting corrosion, and copper-containing aluminum alloys are the most obvious. 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 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. The greater their potential difference, the more serious the galvanic corrosion, almost all aluminum alloys cannot avoid galvanic corrosion. Crevice corrosion, industrial aluminum profile profile aluminum itself or the surface of aluminum and other materials have gaps when they are in contact with other materials. Due to the effect of different gas-filled batteries, the corrosion in the gap is accelerated, but there is no effect outside the gap. 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, and the acidic environment at the top of the crevice is the driving force of corrosion. Corrosion under deposits is a form of crevice corrosion. Intergranular corrosion, pure aluminum does not flourish 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 grains, the anode constitutes a corrosion cell, causing intergranular corrosion. accelerate. Filament corrosion, filiform corrosion is a kind of corrosion under the film, which develops under the film in the form of a worm. This film can make the paint film and other layers, and generally does not occur under the anodic oxide film. Filament corrosion was first discovered under the layers of aircraft, and it has been reported in Europe this year that it has also occurred under spray coatings on aluminum profiles in the construction industry. Filament corrosion is related to alloy composition, pretreatment before coating of aluminum profile and environmental factors. Environmental factors include humidity, temperature, chloride and so on. Disclaimer: The content of this article is reproduced from the building materials procurement website. The copyright belongs to the original author. The purpose of reprinting is to convey more information. It does not mean that this website agrees with its views and is responsible for its authenticity. If the content of the work, copyright and other issues are involved, please call or write to us, and we will deal with it in a timely manner! http://www.jiancai365.cn/news/61665.htm
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