Aluminium surface finishing in the Märkisch district

Anodising - also known as anodising - is a proven electrochemical process for refining aluminium. This process transforms the surface into a hard, porous oxide layer that not only provides effective protection against corrosion and environmental influences, but also gives the material a high-quality, decorative appearance. The layer thickness varies between 5 and 30 µm depending on the requirements.

During anodising treatment, a stable oxide layer is created through the targeted use of electricity, water and sulphuric acid (H₂SO₄):

• Offers corrosion protection
• Has an electrically insulating effect
• Guarantees high hardness and durability
• Can be visually customised

Two thirds of the anodised layer consists of an embedded structure in the material and one third of an outer protective layer - for optimum hold and resistance.

Hard anodising, also known as hard anodising, is a special anodising process for creating particularly thick and hard oxide layers on aluminium. This surface finish changes the friction properties and makes the aluminium extremely resistant to mechanical stress, corrosion, wear and chemical influences - ideal for industrial applications with the highest requirements.
In contrast to classic anodising, where layer thicknesses of between 5-25 µm are common, hard anodising achieves layer thicknesses of 25 to over 100 µm - depending on the alloy and process control.
The hard anodised layer is produced using an electrochemical process in a cold, acidic electrolyte bath. Under high voltage and controlled conditions, a very hard, dense oxide layer grows directly out of the aluminium - it is firmly bonded to the base material and cannot flake off.

Properties of hard anodised aluminium surfaces

• Very high hardness (up to 500-600 HV, depending on alloy and coating thickness)
• Excellent wear protection
• Extremely high corrosion resistance - even with aggressive media
• Electrically insulating
• Good sliding properties
• Heat-resistant up to approx. 400 °C

Chromium(III) passivation with SurTec 650 - the next generation of corrosion protection

Our modern passivation solution with SurTec 650 offers optimum corrosion protection for aluminium components without impairing electrical conductivity - ideal for applications in electronics, aviation or medical technology.

In a precisely controlled process, the cleaned aluminium surface is immersed in a solution containing chromium(III). This creates an ultra-thin protective layer of aluminium chromate which, once dry, provides excellent adhesion and an outstanding basis for subsequent coatings such as paints or powder coatings.
We have been successfully using this process in our production since 2015. The chemistry used is free from chromium(VI) and therefore fulfils all the requirements of the REACH regulation - an important contribution to sustainable and future-proof surfaces.

SurTec 650 - for durable, conductive and REACH-compliant aluminium surfaces.

Through constant process testing, our anodising plant and associated technology has been continuously renewed and optimised in recent years. This included, for example

• Extension of the PLC control system,
• Automation of the crane system,
• Renewal of the waste water system, heating and cooling technology