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The ELB Technology Guide


In contrast to painting and plating

When no dissimilar anodizing layer is applied to the base material, but the aluminum surface is converted into an aluminium oxide.
As a result of conversion processes these oxide layers do not adhere in the conventional sense, but they go true covalent atomic bonds with the base material.
 

With more than 50 years of experience in surface treatment of aluminum alloys for technical applications, we have compiled some information on the subject for you and tell you the technology of anodizing.
 

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Anodized Aluminium

A thin native oxide layer is formed on aluminium already after a short time on the air due to its high affinity for oxygen
  

Only after a few months, this process is completed and the oxide layer formed so thick that no more oxygen diffusion takes place. The layer has reached a thickness of about 0.05 microns and will grow no more.

 

This low layer thickness is not sufficient to seriously protect the aluminium. This is why it is protected by anodic oxidation in an electrolyte with a thick layer of aluminum oxide, which is called in German ELOXAL (ELectrolytic OXidized ALuminum).

 

Technically correct the process is called anodization and the product anodized aluminium.

 
The anodic coating not only gives excellent corrosion protection, but also a very decorative appearance with the ability to color the aluminium surface in a wide variety.

 

 
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