Why do industrial aluminum profiles have rust spots?

Compared with other construction materials, it is relatively rare for industrial aluminum profile profiles to show oxidation and rust, but this situation cannot be completely eliminated. According to the field of application of industrial aluminum, industrial aluminum profiles refer to all aluminum profiles except for architectural doors and windows, curtain walls, indoor and outdoor decoration and aluminum profiles for architectural structures. In the process of using industrial aluminum profiles, what factors will cause them to suffer corrosion and show rust spots? The following will give you a specific analysis: Point corrosion, also known as hole corrosion, is a very localized state of corrosion that produces pinpoints, dots, and holes on metal. Spot corruption is a peculiar form of anode reaction and an autocatalytic process. Aluminum in the atmosphere, fresh water, or neutral aqueous solution will cause point corrosion. The most serious may also cause perforation, but the corrosion hole may still end the development, and the amount of corrosion will adhere to a limit value. The point corrosion is related to the medium alloy at the limit level, 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 industrial aluminum profile profile aluminum alloy, high-purity aluminum profile is difficult to produce point corrosion, copper-containing aluminum alloy is more obvious. Galvanic corrosion is also a characteristic corrosion condition of aluminum. The natural potential of aluminum is very negative. When aluminum is in contact with other metals, aluminum is always in the anode to accelerate the corrosion. According to the field of application of industrial aluminum, industrial aluminum profiles refer to all aluminum profiles except for architectural doors and windows, curtain walls, indoor and outdoor decoration and aluminum profiles for architectural structures. Galvanic corrosion is also called bimetallic corrosion, and its significant level is determined by the absolute position of the two metal potential sequences. The greater their potential difference, the greater the galvanic corrosion. Almost all aluminum alloys cannot avoid galvanic corrosion. Corrosion in the gap, there is a gap when the industrial aluminum profile aluminum itself or aluminum and other materials are in nominal contact. Because of the effect of the different inflatable batteries, the corrosion in the gap is accelerated, but the outside of the gap is not affected. The crevice corrosion is not related to the alloy type, even a very corrosion-resistant alloy will produce crevice corrosion. In recent years, there has been a more in-depth study on the mechanism of crevice corrosion, and the acidic environment at the top of the crevice is the original energy source for corrosion. Corrosion under sediment is a form of crevice corruption. 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 are deposited along the grain boundary, and the absolute grain is the anode to form a corrosive cell, causing accelerated intergranular corrosion . Filamentous decay. Filamentous decay is a kind of under-film decay, which develops under the film in a worm-like form. This kind of film may cause the paint film or other layers to be individually not produced under the anodic oxide film. According to the field of application of industrial aluminum, industrial aluminum profiles refer to all aluminum profiles except for architectural doors and windows, curtain walls, indoor and outdoor decoration and aluminum profiles for architectural structures. Filament corruption was invented under the layer of aircraft as early as this year, and it has been reported in Europe this year that it has also occurred under the spray film of the construction of industrial aluminum profiles. Filament corrosion and alloy composition, the pretreatment of aluminum profile before coating is related to environmental factors. Environmental factors include humidity, temperature, chloride and so on. The above are the important factors that lead to the appearance of rust spots in industrial aluminum profile profiles. I hope it will be of benefit to you!
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