What are the Several Corrosion Types of Industrial Aluminum Profiles?

As a Modular Pipe System Manufacturer, I would like to share with you several corrosion types of industrial aluminum profiles:

Aluminum Extrusion Profile

1. Point 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 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.

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.

Characteristics of industrial aluminum profiles:

1. Compared with other commonly used metals, aluminum profile has a lower density and a lighter weight. The density is only 2.70 g/cm3, which is 1/3 of copper or iron. There is no need to consider the load-bearing capacity during use.

2. In the production process, the aluminum profile adopts two processes of heat and cold, which has strong corrosion resistance.

3. Aluminum profile has good ductility and can be made into light alloy with many metal elements with excellent material.

4. Compared with other metal materials, aluminum profile has strong plasticity, good productivity, and has excellent advantages for production.

Our company also has an Aluminum Extrusion Profile on sale, welcome to contact us.