Introduction to the corrosion of industrial aluminum profiles?

Three common types of corrosion of industrial aluminum profiles.

1. Gap corrosion.

Gap corrosion is due to the different use of inflatable cells, resulting in accelerated gap corrosion, no effect outside the gap. Gap corrosion has nothing to do with the type of alloy, even if it is very corrosion-resistant alloy will also produce gap corrosion. In recent years, the mechanism of interstitial corrosion has been studied very intensively. The acidic environment at the top of the gap is the driving force of corrosion.

2. Intercrystalline corrosion.

Intercrystalline corrosion refers to pure aluminum in the intercrystalline corrosion between the corrosion. The cause of intercrystalline corrosion is related to improper heat treatment. Alloy chemical elements or intermetallic compounds along the grain boundary precipitation precipitation. Compared with the grain, the grain is formed by the anode corrosion cell, accelerating intercrystalline corrosion.

What is the introduction of corrosion in industrial aluminum profiles? Industrial aluminum profile corrosion introduction

3. Filiform corrosion.

Filamentary corrosion is mainly due to sub-membrane corrosion, showing worm-like development under the film. For example, this film can lead to paint film, and it may be painted on, basically does not appear under the anodic oxide film.