In the electrolytic oxidation of aluminium, unlike galvanic processes, no metallic layer is deposited on the base material. In this process, the uppermost aluminium layer is converted into an oxide (Al203). The oxide layer grows 2/3 into the base material and 1/3 onto the base material. The growth is also very dependent on the structure and alloy of the aluminium. This influences not only the growth of the oxide layer, but also its optical appearance, colouring capacity, hardness and corrosion resistance. Therefore, it is essential to choose the base material carefully.
Electrolytically oxidised aluminium
The resulting anodised layer is current-insulating and corrosion-resistant. The achievable layer thicknesses are only 5-10µm for copper-containing aluminium alloys with a copper content greater than 2%, and up to 25 µm for copper-free alloys. This process is used in many areas of industry. Anodised coatings are very variable and can be used decoratively. By specific mechanical pre-treatment or by partial covering of surfaces and drill holes, complicated requirements as well as optical effects such as glossy to silky-glossy or matt surfaces can be achieved. The good adsorption capacity of the porous anodised layer enables safe and permanent colouring. The anodised pores are closed and the dyes are sealed into the layer by subsequent sealing.
Achievable layer thicknesses: With copper-free aluminium up to max. 25 µm and with aluminium alloys with more than 2% copper (turning and milling quality) only 5-10 µm are possible. The coatings produced with high copper alloys are softer and not as durable. Only 1/3 of the generated layer thickness is noticeable as a "deposit". 2/3 of the layer diffuses into the base material. Please take this into account for fitting parts! Due to our close cooperation with various suppliers, we can offer you glass bead blasting, grinding and polishing as pre-treatment.
The anodising process is a method of surface finishing to create an oxidic protective layer on aluminium by anodic oxidation. The properties of the aluminium surface are changed in the process.
- Our baths allow us to process workpieces with dimensions up to 105 x 295 cm in natural, grey, black, red, gold, orange, brown and blue.
- ten other colours up to a size of 100 x 60 cm.
- Optical (colour and surface structure) as well as haptic properties can be taken into account according to your wishes and requirements.
Protection & Haptics
- Improvement of the corrosion protection, the optical properties and the hardness of the surface.
- Complicated requirements can be realised, for example, by partially covering bores and threads.
- Dimensional accuracy of your workpiece.
It should be noted that only 1/3 of the generated layer thickness is noticeable as "application". 2/3 of the layer diffuses into the base material. Please note this for fitting parts!
The technical hard anodising process is a combination of physics and chemistry. The hard and dense layers have an extremely high resistance - especially to abrasive stress. Hard anodised parts can be used wherever abrasive stresses occur. Due to the density and structure of the layer, hard anodised layers also have a high corrosion resistance. The dielectric strength per µm is 20 to 30 V per base material. Hard anodised coatings can also be impregnated with Teflon, which improves the sliding properties.
Grey, Black, Nature
In principle, hard anodising is the same process as anodising. Here, the aluminium is converted into an oxide. The layer thicknesses achieved are many times greater, which can be up to 100 µm depending on the alloy. In addition, the anodised pores are smaller in diameter, which leads to higher hardness.
- With hard anodising, colouring is not possible with every colour, and the appearance also differs from the anodising process. We will be happy to advise you.
- Our baths allow us to process workpieces with dimensions up to 105 x 295 cm. Uncoloured components, as well as black and RAL 8000 are possible in these dimensions.
- High copper alloys with more than 2% copper content cannot be hard anodised.
Yes We Do
- High corrosion protection
- High abrasion resistance
- High hardness due to alloy of approx. 500HV
- High dielectric strength of 20-30 V per µm layer thickness
- Dimensional accuracy of your workpiece. It should be noted that only 50% of the generated layer thickness is noticeable as a "job". 50% of the layer diffuses into the base material. Please note this for fitting parts!
High-tech made in Germany
We have been audited and certified in quality management and environmental management since 2008. The highest standards are a matter of course for us and are reflected in great acceptance and customer satisfaction.
We keep emissions low through modern filter systems and save resources through energy recovery.
A photovoltaic system generates electricity for our own use and is designed for expansion. Other measures such as waste avoidance and proper disposal are a matter of course for us.