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Zhejiang Guoyao Aluminium Co., Ltd.

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Corrosion Types And Characteristics Of Common Industrial Aluminum Profiles

Generally speaking, the basic types of industrial aluminum and aluminum Aluminum Alloy corrosion pitting corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, stress corrosion, exfoliation corrosion, corrosion fatigue, filiform corrosion, the corrosion phenomenon concentrated here, only aluminum construction aluminum industry in the production and use of common.

Pitting corrosion, pitting corrosion, is a very localized corrosion pattern on metal. Point corrosion is a unique form of anodic reaction, and it is a autocatalytic process. Aluminum in the atmosphere, fresh water, or neutral water solution will point corrosion, serious can lead to perforation, but the corrosion hole may eventually stop development, corrosion amount to maintain a limit value. Point corrosion is related to medium alloys, such as chlorine ion, fluorine ion, etc.. There must also be substances that promote cathodic reactions, such as dissolved oxygen in aqueous solutions, copper ions, etc.. From industrial aluminum Aluminum Alloy fine aluminum, high pure aluminum is generally difficult to point corrosion, the most obvious Aluminum Alloy corrosion of copper.

Galvanic corrosion is also a characteristic form of aluminum corrosion. The natural potential of aluminium is very negative. When aluminum contacts other metals, aluminum is always at the anode, which accelerates the corrosion. Galvanic corrosion is also called double metal corrosion, and the severity of corrosion is determined by the relative position of two metal potential orders. The larger the potential difference is, the more serious the galvanic corrosion is, and almost all aluminum alloys can not avoid galvanic corrosion.

Crevice corrosion, contact surface of industrial aluminum aluminum or aluminum and other materials itself when there are gaps, due to differences in air gap corrosion battery, acceleration, and outside the gap has no effect. Crevice corrosion has little relation with the alloy type. Even the very corrosion resistant alloy can cause crevice corrosion. In recent years, the mechanism of crevice corrosion has been studied more deeply. The acidic environment at the top of crevice is the driving force of corrosion. Corrosion under sediment is a form of crevice corrosion.

Intergranular corrosion of pure aluminum is not prosperous intergranular corrosion, intergranular corrosion and heat treatment are related to improper, alloying elements or intermetallic precipitates along the grain boundaries, grain is relative to the anode corrosion battery, caused by intergranular corrosion accelerated.

Filiform corrosion, filiform corrosion is a kind of corrosion, with the membrane under development, this film can make the film, also can make the other layer, generally do not occur in the anodic oxide film. Filiform corrosion was first detected in aircraft layers, and this year has also been reported in Europe, as well as in construction, aluminum and spray films. Filiform corrosion and alloy composition, pre treatment of aluminum profile, environmental factors, humidity, temperature, chloride, etc..


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