The electrochemical coating of aluminium

High abrasion resistent and stable

Anodizing is an electro-chemical process to transform the surface of aluminium to aluminium oxide. The resulting oxide layer is permanently connected with the aluminium.

Hard-anodized layers are generated by anodic oxidation processes in cold electrolytes. By means of an electric current, a hard, ceramic layer of aluminium oxide is formed on the surface of the part. This layer consists mainly of amorphic у-aluminium oxide and forms of habitual, hexagonal cells perpendicular to the surface of the part.

These are processes suitable for serial and mass production parts. we create like pattern in one of our pilot plants for this purpose.

Niclas Champaert
Tel. +49 7021 5704-172
Fax +49 7021 5704-27172

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  • the anodized aluminium layer protects the aluminium against tribological and chemical impacts
  • the hard-anodized layers protect paramount against attrition and corrosion


  • Alloy: all aluminium alloys with few exceptions
  • Dimensions: from few millimeters up to a length of 1300 mm and width 1000 mm
  • Weight: up to a maximum of 25 kg for each part
  • Layer thickness: 1 – 100 μm – depending on the base alloy
  • Layer hardness: up to 900 HV – depending on base material and layer thickness
  • preparatory treatment: chemical pre-treatment possible – E0 or E6
  • contact point: mandatory for power transmission and fixation
  • Colorizing:  colorizing black feasible – please be aware: not all alloys can be colorized
  • Sealing: heat sealing – when required – mandatory when colorizing


  • Novatec 810 (B)
  • Novatec 850 (B)
  • Novatec 7000

eloxalRelevant criteria for anodizing and hard-anodizing

By using various electrolytes, temperatures and modulated current densities, anodized oxide layers get extraordinary characteristics. Hardness, Rz-value, corrosion resistance and wear resistance are significantly improved by the ceramic anodized layer.

Even selective coatings are technically feasible in mass production. However, only certain alloys can be coated, depending on their alloying elements.

The tribological and chemical properties of anodized layers can be even further improved with corresponding post-treatment.

Following procedures might be interesting