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Chrome and cadmium substitute

Chrome and cadmium substitute

Alternative, environmetally-friendly coatings.

Are we reducing environmental impact with this?

Are we reducing environmental impact with this?

Yes, because these coating processes have been developed as substitutes for coatings based on chromium(VI) or cadmium, which are considered carcinogenic. In particular, environmentally harmful production processes are eliminated, as are materials on the component surface that can lead to health hazards.

IVD

IVD aluminium vacuum coating was originally developed by McDonnell Douglas as a replacement for cadmium treatment of steel and titanium components.

The sequence of the coating process is as follows: First, the parts are degreased to remove cutting or dewatering oils. The next process step is a fine-grained sandblasting. On the one hand, the surface is mechanically cleaned, and on the other hand, a profile with a large surface is produced. The latter supports the physical bonding of the coating to the substrate.

During the process, the parts are held on an electrically conductive frame in a vacuum coating chamber. The parts are moved into the coating chamber, which is evacuated. An inert gas is introduced into the chamber and an electric voltage is applied. This leads to a plasma glow discharge, which is clearly visible as a violet glow in the chamber. The result is a very clean surface on the substrate.

Once this process is completed, the actual coating process can begin. Aluminium wire is now fed to a series of overheated ceramic crucibles. A high voltage is applied to produce very high temperatures and the aluminium evaporates to an electrically charged mist. The negatively charged aluminium atoms move through the vacuum and deposit on the parts to be coated, which are electrically "grounded".

After coating with IVD aluminium, the parts have a dull grey appearance and must be handled with care. The next step is to close the pores in the outer surface of the coating by glass bead blasting. The parts may be used "as plated" or, more frequently, the pure aluminium surface is converted to an aluminium chromate layer by a chemical conversion coating.

  • Properties

    IVD aluminium offers good corrosion protection even at high temperatures. The coating can serve to prevent bimetallic or galvanic corrosion. The corrosion resistance can be increased in all cases by a subsequent chemical conversion coating.

    Another big advantage of IVD aluminium vacuum coating is that it can be painted with very little surface pretreatment. The surface is suitable for many paints, including commonly prescribed liquid-tight epoxy resin-based primers and dry film lubricants.

  • base material

    Primarily, components made of steel alloys and titanium materials are coated.

  • Application

    Coating with IVD aluminium is primarily used in the aerospace and defence industries.

    One example is the coating of titanium fasteners to which aluminium components are attached.

    The process is certified for NADCAP and for a number of large aerospace companies including Airbus, Boeing, Bombardier, Leonardo, Rolls-Royce, Safran and UTC.

    The components that are coated for these end users can vary in size and complexity to a surprising extent, from small fasteners to larger components such as airframe components, engine components, and composite assemblies.

  • Process Locations

    Aalberts Surface Treatment Ltd.

    Clover Street
    NG17 7 LJ Kirkby-in-Ashfield
    Grossbritannien

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

    Write an email

MAGPASS-COAT®

Finishing with MAGPASS-COAT® is carried out using an immersion treatment. The workpiece is immersed in a chrome-free, inorganic and aqueous passivation solution and a conversion layer develops on the workpiece surface. This conversion layer consists of oxides of the passivation solution and the base material.

  • Properties

    The MAGPASS-COAT® process can be used specifically as an equivalent to existing chromating processes. The finishing process produces uniform and contour-true layers and thus even enables the coating of complex surface geometries, such as edges, cavities, reliefs, holes, blind holes or undercuts. It is electrically conductive and serves as an intermediate layer for subsequent treatments such as paints or adhesives.

  • base material

    The MAGPASS-COAT® process is suitable for finishing all magnesium materials.

  • Application

    The main areas of application for MAGPASS-COAT® coatings are all situations where chromating should be replaced by chromium-free systems. The chromium-free passive layer alone serves as temporary corrosion protection and for the improvement of adhesion of paints or adhesives. In the overall coating system with subsequent painting, it contributes to the corrosion protection of components.

SilverTouch®

SilverTouch® is decorative PVD coating. The coating system consists of primer and base coat, thin aluminum film and final coat.

After a wet chemical pretreatment, a primer is applied to the materials to prepare them for metallising. An aluminium layer of around 0.10 µm is applied under high vacuum without the use of any other process gases. The result is a shiny, reflective metallic surface. After passivation, a thermal or UV-curing final coat is applied, providing the required surface hardness.

Handling and painting robots execute all of the production steps automatically. The chemicals used in this process are not harmful to the environment.

  • Properties

    The gloss level can be adjusted to achieve a glossy or matt finish for the workpiece according to the customer wishes. This makes it possible to give plastic the appearance of metal. Hues such as gold, brass and bronze are also available.

    SilverTouch® is distinguished by its appealing silky haptics, a good temperature resistance and a medium corrosion resistance.

  • base material

    It is ideally suited for all types of metal and plastic commonly used in the automotive, furniture, household and electrical appliance industries.

  • Application

    This coating method was developed to replace decorative chrome coatings such as those used to make components visually appealing, e.g. in the furniture industry, for design elements in the automotive industry or for plumbing fixtures.

  • Process Locations

    Aalberts Surface Treatment GmbH

    Hohenhorststraße 1
    21337 Lueneburg
    Deutschland

    Tel.: +49 4131 882 10
    Fax: +49 4131 882 250

    Write an email

SurTec® 650

Chromium-free (VI) passivation SurTec® 650 is used in immersion, spraying or wipe application processes. The chemical process produces a faintly iridescent conversion layer. Chromium-free (VI) particles are incorporated into the coating for optimum corrosion protection.

  • Properties

    The chrome-free (VI) passivation SurTec® 650 offers optimum corrosion protection, has low electrical contact resistance and is ideal for after-treatment of anodising layers and as a primer for paints, powder coatings and adhesives.

  • base material

    The chrome-free (VI) passivation SurTec® 650 and aluminium yellow chromating are suitable for almost all technically interesting aluminium alloys.

  • Application

    The chrome-free (VI) passivation SurTec® 650 is ideally suited for use in the electronics industry due to the low surface resistance as well as for use in the aviation industry because of the high corrosion protection on unpainted surfaces. A third user industry is the automotive industry due to the sum of all characteristics of the passivation layer.

  • Process Locations

    Aalberts Surface Treatment GmbH

    Lindenallee 26
    39288 Burg
    Deutschland

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

    Write an email

    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 Sp.z o.o.

    ul. Strefowa 5
    58-200 Dzierżoniów
    Polen

    Tel.: +48 74 8108508

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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

    Write an email

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

    Functional finishing of metals by means of electroless nickel plating

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    Electroless Nickel plating
  • Screw locking

    Screw locking

    Strong bonds

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    Screw locking
  • Sherardizing

    Sherardizing

    Zinc-iron layer to a steel surface.

    to the process
    Sherardizing

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