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Technical anodising

Technical anodising

Optimisation of aluminium surfaces - functional and decorative

Why do honeycombs impress us?

Why do honeycombs impress us?

Honeycombs provide a stable interconnection through their hexagonal structure and shine with the honey stored inside. Our technical anodised layers can also be modified, within certain limits, by incorporation of colour into the pores.

The process

Technical anodising 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.

  • Characteristics

    Technically anodised 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 anodisation parameters and the layer thickness. Technically anodised coatings can also fulfil different decorative requirements. For these purposes, for example, pretreatments such as pickling, grinding, blasting or polishing are performed.

    Technically anodised 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 anodised layer is influenced by the composition of the material, in particular by the alloy constituents. The technically anodised coating significantly increases the wear resistance of the aluminium. However, highly wear-resistant surfaces are only produced by hard coating (see HART-COAT® process). The combination of PTFE with technical anodising coatings results in very good anti-friction properties for the coating.

  • Base Materials

    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.

  • Field of 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.

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

  • HART-COAT®

    HART-COAT®

    Hard anodisation, hard coating

    to the process
    HART-COAT®
  • SELGA-COAT®

    SELGA-COAT®

    Selective galvanic finishing of metal surfaces

    to the process
    SELGA-COAT®
  • TUFRAM®

    TUFRAM®

    Hard anodising with fluoropolymers

    to the process
    TUFRAM®
  • KEPLA-COAT®

    KEPLA-COAT®

    Plasma chemical coating for the finishing of aluminium and titanium alloys

    to the process
    KEPLA-COAT®

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