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Anodizing

Anodizing

Functional and decorative coating of aluminium components as anode in special electrolytes.

What is so special about these layers?

What is so special about these layers?

These layers involve so-called conversion layers. Particles of the base material become incorporated into the layer, which results in the enormous adhesive strength of the anodic layers.

Colour anodizing

We offer colored coatings for aluminum materials as well as for titanium alloys.

Aluminum alloy components are anodized or hard anodized in an electrolyte with color additives.

Components made from titanium or a titanium alloy are anodized 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 colored due to interference (superposition of light waves).

  • Properties

    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 material

    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.

  • 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.

  • Process Locations

    Aalberts Surface Treatment GmbH

    Coswiger Straße 16
    12681 Berlin
    Deutschland

    Tel.: +49 30 549904 0
    Fax: +49 30 549904 20

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    Aalberts Surface Treatment GmbH

    Jeschkenweg 28
    87600 Kaufbeuren
    Deutschland

    Tel.: +49 8341 6601 0
    Fax: +49 8341 6601 40

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    Aalberts Surface Treatment S.R.L.

    Via Staffora 20/2
    20090 Opera (Mi)
    Italien

    Tel.: +39 02 576065 09
    Fax: +39 02 576065 28

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    Aalberts Surface Treatment AG

    Industriezone Schächenwald
    6460 Altdorf
    Schweiz

    Tel.: +41 41 875670 0
    Fax: +41 41 875670 1

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Technical anodizing

Technical anodizing is a coating for the functional and decorative finishing of aluminium materials. The coating takes place in an acid electrolyte at temperatures which are slightly below room temperature. The workpiece is connected as an anode. During the treatment, the workpiece surface is converted into a porous (dense), hard and wear-resistant aluminium oxide layer. Special compression processes can close the pores and greatly improve corrosion resistance. The thickness of the layer produced depends on the intended use, the requirements imposed on the layer and the subsequent level of use.

  • Properties

    Technically anodized coatings grow 1/3 out of the metal and 2/3 into the metal. As a result, the bond of the layer with the base material is extremely high. However, the growth behaviour must be considered in the design of the components with respect to fitting.

    Due to different electrolytes and electrolyte parameters, anodically produced oxide layers have very varied properties and satisfy the most diverse requirements. The appearance, ie. colour and gloss, and the properties of the oxide layers, e.g. hardness, corrosion resistance and wear resistance, depend on the composition of the base material and above all on the alloying additions as well as on the surface treatment, the anodization parameters and the layer thickness. Technically anodized coatings can also fulfil different decorative requirements. For these purposes, for example, pretreatments such as pickling, grinding, blasting or polishing are performed.

    Technically anodized coatings are resistant to non-acidic and alkaline media. With appropriate layer thickness and compression, the layer even withstands acidic or weakly alkaline attacks for a short time. The hardness of the technically anodized layer is influenced by the composition of the material, in particular by the alloy constituents. The technically anodized coating significantly increases the wear resistance of the aluminum. However, highly wear-resistant surfaces are only produced by hard coating (see HART-COAT® process). The combination of PTFE with technical anodizing coatings results in very good anti-friction properties for the coating.

  • base material

    Almost all technically interesting aluminium alloys, whether wrought alloys, cast alloys or die-cast alloys, can be technically anodised. However, the alloy has a great influence on the colour of the product to be anodised. It is also possible to selectively produce black oxide layers. We are happy to advise you.

  • Application

    Technically anodised aluminium parts offer good corrosion and wear protection in almost all sectors: construction industry, chemical industry, computer industry, electrical engineering, vehicle construction, household appliances and goods, lighting industry, aerospace, mechanical engineering, medical technology, furniture and fittings industry, optics / precision engineering, Sports and camping industry, textile industry.

    Technical anodising is also used as a corrosion protective coating before painting components used near the sea.

  • Process Locations

    Aalberts Surface Treatment GmbH

    Boelckestraße 25 - 57
    50171 Kerpen
    Deutschland

    Tel.: +49 2237 502 0
    Fax: +49 2237 502 100

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    Aalberts Surface Treatment GmbH

    Zillenhardtstraße 2
    73037 Goeppingen-Voralb
    Deutschland

    Tel.: +49 7161 15688 0
    Fax: +49 7161 15688 100

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    Aalberts Surface Treatment GmbH

    Klausnerring 28
    85551 Kirchheim-Heimstetten
    Deutschland

    Tel.: +49 89 990241-0
    Fax: +49 89 990241-10

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    Aalberts Surface Treatment GmbH

    Coswiger Straße 16
    12681 Berlin
    Deutschland

    Tel.: +49 30 549904 0
    Fax: +49 30 549904 20

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    Aalberts Surface Treatment GmbH

    Lindenallee 26
    39288 Burg
    Deutschland

    Tel.: +49 3921 4829 0
    Fax: +49 3921 4829 19

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    Aalberts Surface Treatment Ges.m.b.H.

    Gewerbestraße 21
    5261 Helpfau-Uttendorf
    Österreich

    Tel.: +43 7724 44144
    Fax: +43 7724 44144 10

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    Aalberts Surface Treatment GmbH

    Jeschkenweg 28
    87600 Kaufbeuren
    Deutschland

    Tel.: +49 8341 6601 0
    Fax: +49 8341 6601 40

    Write an email

    Aalberts Surface Treatment S.R.L.

    Via Staffora 20/2
    20090 Opera (Mi)
    Italien

    Tel.: +39 02 576065 09
    Fax: +39 02 576065 28

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    Aalberts Surface Treatment Sp.z o.o.

    ul. Strefowa 5
    58-200 Dzierżoniów
    Polen

    Tel.: +48 74 8108508

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    Aalberts Surface Treatment (Hangzhou) Co., Ltd.

    Jiang Dong Er Rd. No. 1646
    311222 Hangzhou
    China

    Tel.: +86 571 5757 9777

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    Aalberts Surface Treatment Ltd.

    Clover Street
    NG17 7 LJ Kirkby-in-Ashfield
    Grossbritannien

    Tel.: +44 1623 753 107
    Fax: +44 1623 754 538

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    Aalberts Surface Treatment AG

    Industriezone Schächenwald
    6460 Altdorf
    Schweiz

    Tel.: +41 41 875670 0
    Fax: +41 41 875670 1

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    Aalberts Surface Treatment s.r.o.

    Budovatelů 484
    538 43 Třemošnice
    Tschechien

    Tel.: +420 469 617 631
    Fax: +420 469 662 020

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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

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    Electroless Nickel plating
  • Selective coatings

    Selective coatings

    Partial finishing of metal surfaces

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    Selective coatings
  • Sealing

    Sealing

    High performance sealing of aluminium surfaces

    to the process
    Sealing

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