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Colour anodising

Colour anodising

Coloured coatings for aluminium and titanium

Why do we like to see a rainbow?

Why do we like to see a rainbow?

Because we are impressed by the colour variety of a rainbow, and the colours appeal to us visually. So it should be with the variety of colours that we produce with colour anodisation on aluminium and titanium materials.

The process

We offer coloured coatings for aluminium materials as well as for titanium alloys.

Aluminium alloy components are anodised or hard anodised in an electrolyte with colour additives.

Components made from titanium or a titanium alloy are anodised in a special acidic electrolyte. On the surface of the components, a thin, very adhesive titanium oxide layer is formed. The coating thicknesses lie between about 20 to 120 nm and thus are a fraction of the wavelength of visible light. Incident light is reflected by the surface of the actually colourless layer and by the layer base. The coating appears coloured due to interference (superposition of light waves).

  • Characteristics

    Coloured coatings on aluminium materials show good UV resistance, depending on the anodising process used. The colours black, titanium grey, blue, red, gold and green are available. We also like to meet customer-specific colour requests.

    In addition to the colour, the titanium oxide coating provides very good electrical insulation and biocompatibility. By varying the layer thickness, almost any desired colour can be produced depending on the base material.

  • Base Materials

    Almost all technically interesting aluminium alloys, be they wrought alloys, cast alloys or die-cast alloys can be colour anodised.

    It is a little more complicated with the titanium materials: The alloy TiAl6V4 is best suited for colour anodisation. The colours obtained are very strong, of good quality and reproducible.

    Ti2 can also be coated in a wide colour spectrum. Compared to the material TiAl6V4, colour shifts towards blue occur and the colours appear somewhat more subdued.

    Pure titanium can only be colour-anodised in blue and yellowish reproducible manner. This material is unsuitable for decorative purposes.

  • Field of Application

    Colour-anodised aluminium components are used wherever a certain degree of corrosion and wear protection is required in combination with a decorative colour. This can be in the field of architecture as well as in electrical engineering, photo and video technology, in household appliances, hunting weapons, sporting goods or in the motorcycle industry. Of course, there are also applications in the automotive or mechanical engineering.

    Applications for colour anodisation of titanium materials can be found, amongst others, in medical technology: Implants made from a titanium material, which temporarily remain in the human body to heal fractures, are colour anodised. This helps the surgeon to quickly identify the components. The coated implants are neutral in the body. They do not grow together with bone and tissue and can be easily removed after healing.

    Because of their biocompatibility and their decorative appearance, the application of coloured titanium oxide coatings is also useful in the optical and jewellery industries, e.g. for watches or costume jewellery. In the motorcycle industry, titanium materials meet the demand for maximum strength and low weight. The colour anodised surface, for example of wheel nuts, meets the design requirements of the customers. In addition to the colour, the oxide layer serves as a diffusion barrier to the titanium material. Since the coating insulates very well electrically, it can also be used in electrical engineering.

Product enquiry

If you would like to tell us something about the product presented here, you are welcome to do so. Your enquiry, your comment, your wishes will be forwarded directly to your personal contact person.

More Surface Treatments



    Hard anodisation, hard coating

    to the process


    Plasma chemical coating for the finishing of aluminium and titanium alloys

    to the process


    Plasma chemical coating for finishing magnesium alloys

    to the process
  • CompCote®


    Aluminium oxide polymer composite coatings

    to the process

Do you have a question about materials or processes?
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Aalberts Industries