What are the Several Corrosion Types of Industrial Aluminum Profiles?

As an Aluminum Rack System Factory, let me share with you. Before understanding the processing of aluminum products, let us first understand the element of aluminum. As we all know, aluminum is a metal element in the earth's crust. It has good ductility, flexibility, and electrical conductivity. It can be drawn into filaments and rolled into foils. Therefore, it is often used to produce wires and cables, and used in food factories to package food.

Aluminum Extrusion Profile

It can be used in major industries such as aviation, construction, automobiles, and food. Next, let us understand aluminum products. There are many types of aluminum products, such as casting materials, pure aluminum alloys, aluminum-manganese alloys, aluminum-magnesium alloys, aluminum-copper-tin alloys and so on. There are several forms of processed aluminum products: sheet, plate, roll sheet, strip extruded product, pipe, solid bar, profile and so on. Processing refers to the reproduction of aluminum products, and the deep processing of aluminum products refers to the improvement of semi-finished aluminum products. This means that it is further manufactured on the previously formed aluminum products, thereby making its performance more reliable.

Several corrosion types of industrial aluminum profiles:

1. 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 cause perforation, but the corrosion hole may 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.

2. 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 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, resulting in accelerated corrosion in the crevice, but 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 boundaries. Compared with the grains, the anode constitutes a corrosion cell, causing intergranular corrosion. Corrosion accelerates.

5. Filamentous corrosion

Filament 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 or other layers, and generally does not occur under the anodic oxide film.

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