Aluminium Passivation

Aluminium Passivation is a form of protection that allows aluminum to resist the aggression of substances present in the atmosphere and at the same time allows it to maintain its high electrical conductivity. Passivation is an electrochemical phenomenon that can slow down or completely prevent the corrosion reaction of metallic materials, which otherwise would occur.

This phenomenon consists in the formation of a thin film (made from corrosion products, aggressive substances present in the environment or oxygen adsorbed on the metal surface) which adheres perfectly to the part of the workpiece surface in contact with the aggressive environment (eg water or air).

In order for the phenomenon of passivation to occur, this film must hinder the diffusion of the oxidizing agent (generally oxygen), so it must be "compact", that is it must be dense and not very porous.

The conversion layers that result are very thin (with a thickness of 0.5 microns or even less) and possess the property not only of providing adequate protection against corrosion but also of providing a necessary support to ensure adherence to the metal of subsequent organic finishing layers, such as paint or varnish.
Passivation Chromic maintains the conductivity of aluminum unchanged.

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