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Mifa extrusion aluminium

Anodizing aluminium profiles

Anodizing aluminium profiles means growing a protective oxide layer. The anodizing process steps are as follows: profiles are placed in an immersion bath containing sulphuric or chromic acid, which in turn leads to advantages like an improved protection of the metal. The metal serves as an anode, which is why we call this surface treatment anodizing.

Layer thicknesses from 5 to 20 µm can be achieved depending on the application of the profile, the desired layer properties, and other parameters. Only 1/3 of the oxide layer is built up; the rest penetrates the aluminium during anodizing. It is important to carefully consider this during the design phase.

Anodizing aluminium profiles at Mifa

Surface treatment to improve products

Surface treatments improve your magnesium or aluminium components. Corrosion cannot take place, and wear resistance increases while friction decreases. When aluminium profiles are visible, an attractive surface is essential. Coatings can also provide this. All profiles or products benefit from an optimal surface treatment. Mifa can perform many different surface treatments. And if necessary, we can develop a tailor-made coating.

Types of anodizing

At Mifa, we have three methods to anodizing aluminium profiles:

  • Sulphuric acid anodizing.
  • Hard anodizing of aluminium profiles.
  • Chromic acid anodizing.

Almost all aluminium alloys can be anodized. The alloy is a determining factor for the colour of the anodized part. An alloy of the 3000 series turns grey, and a 7000 alloy turns gold. At Mifa however, we can supply the protective oxide layer in different colours. Black or orange are included in our package as standard. Other colours are always possible on request.

Hard anodizing aluminium profiles

There are two main benefits when it comes to hard anodizing profiles:

  • Increased hardness
  • Wear resistance

In order to realise this, Mifa created HART-COAT®, a coating specifically made for improving the aluminium materials. The use of this type of anodizing creates an oxidation of the surface, which leads to a ceramic-like layer. The properties of the HART-COAT® layer can be adapted to the type of material being treated by means of variable process parameters according to the specific requirements. Don't hesitate to contact us for more details on hard anodizing

Technical anodizing

Another example of our anodizing aluminium processes, is by using technical anodizing. The main advantages are:

  • Protection against corrosion
  • Protection against wear

This way of anodzing is also known as normal anodizing. Next to the mentioned advantages, the coating is also used to improve aluminum parts in a more decorative way. The coating is performed in an acid electrolyte at temperatures slightly below room temperature. Make sure to contact us for more details on technical anodizing

Anodizing layer properties


up to 20 µm


Max. 2,000-hour salt spray test – in conformance with DIN 50021 ESS


approx. 250 HV 0.025 depending on the alloy


MIL-A-8625F Type II

Would you like to know more about anodizing aluminium profiles?

If you would like more information about anodizing aluminium profiles, we would be happy to tell you more. Feel free to fill in the contact form, our experts in aluminium anodizing will reach out to you within one working day. If you would like to immediately contact us, please call our employees during office hours on the following number: +31 (0)77-389 88 88

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Mifa Aerospace