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Electroless Nickel plating

Electroless Nickel plating

Nickel phosphorous alloy coatings

What is the characteristic of Electroless Nickel?

What is the characteristic of Electroless Nickel?

A characteristic feature of our versatile Electroless Nickel DURNI-COAT® process is the uniform and accurately contoured coating, even on geometrically complex materials.

DURNI-COAT®

DURNI-COAT® is a process for the electroless nickel plating of metals (chemical nickel). AHC has more than 50 years of practical experience with this coating process. Every year more than 350 million components are finished with DURNI-COAT®.

The DURNI-COAT® process takes place as a chemical deposition without any external power source. For this process, the workpiece is immersed in an aqueous process solution with a defined content of nickel ions. During the process, these ions reduce to nickel metal. Hypophosphite ions in the solution are the chemical reactants and suppliers of the necessary electrons. They are oxidised to orthophosphite in the course of the reaction. A nickel-phosphorus alloy layer forms on the surface of the workpiece. This layer effectively protects the workpiece against wear and corrosion.

Electroless nickel plating with the DURNI-COAT® process is carried out in accordance with DIN EN ISO 4527.

  • Properties

    The performance spectrum of DURNI-COAT® coatings ranges from chemical resistance, dimensional stability and optimum anti-friction properties to electrical conductivity and increased hardness. The coatings are contour-true and evenly deposited. This ensures optimal finishing even for geometrically complex components with edges and depressions, accessible cavities or holes.

    The DURNI-COAT® wear and corrosion resistance are dependent upon the phosphorus content of the coating. Therefore, there are phosphorus-rich and phosphorus poorer layer coating variants. The phosphorus content can be adjusted under specially defined process conditions. In addition, the layer thickness influences the resistance of the electroless nickel.

    Dispersion layers are offered with PTFE (PTFE-DURNI-DISP) in order to increase the anti-friction properties or with silicon carbide (SIC-DURNI-DISP) to increase the wear resistance.

  • base material

    Electroless nickel DURNI-COAT® is suitable for surface finishing of all low-alloyed ferritic steels, cast iron materials, stainless steels, non-ferrous metals such as copper, brass or bronze, aluminium alloys and sintered metal materials.

    The suitability of further materials for electroless nickel plating can be clarified by means of sample coatings.

  • Application

    The three most required properties in the application of electroless nickel coatings are wear protection, corrosion resistance and contour accuracy. This is followed by solderability, good friction characteristics, high ductility and certain magnetic properties. Often several of the properties listed are required at the same time. Although the electroless nickel coatings are very versatile, in practice it is usually not possible to optimally fulfil multi-dimensional requirements with just one layer. Therefore, it is a great advantage to be able to adjust the properties of DURNI-COAT® coatings within certain limits.

    The selection of the suitable coating variant should be made in close cooperation between the user and the coater. This is the only way to achieve the quality of the electroless nickel coatings in addition to cost-effectiveness.

    Examples of DURNI-COAT® electroless nickel plated components include: wastewater engineering components, drive assemblies, fittings, mining equipment parts, nozzles, printing machine components, printing rollers, vehicle parts, filter housings, guide bushes, gear parts, flaps, pump bodies for natural gas and oil use, reactor construction, components which are subjected to vibration, textile machine parts, valves, compressors, packaging machine parts.

    The customer industries of DURNI-COAT®finished components include, amongst others: instrument construction, automotive construction, mining, office technology, chemical industry, data technology, railway technology, electronics, electrical engineering, power engineering, aircraft construction, household appliance industry, hydraulic industry, communications technology, food industry, mechanical engineering, medical device construction, measurement technology, pharmaceutical industry, pneumatic industry, reactor technology, control technology, textile industry, defence technology.

  • 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

    In der Krümme 2
    64331 Weiterstadt
    Deutschland

    Tel.: +49 6151 9806 0
    Fax: +49 6151 8994 70

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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

    Kronskamp 122
    22880 Wedel
    Deutschland

    Tel.: +49 4103 80012 0
    Fax: +49 4103 80012 29

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    Aalberts Surface Treatment Eindhoven B.V.

    Hurksestraat 32
    5652 AL Eindhoven
    Niederlande

    Tel.: +31 402 5076 07

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NEDOX®

During the NEDOX® process, a nickel-phosphorous alloy is applied to the metal surface under controlled conditions. This coating contains innumerable pores formed by a series of patented manufacturing steps.

The surface is sealed by the controlled diffusion of polymers, with complete integration of the polymers into the surface in the final phase of the NEDOX® process. The layer is accurately contoured and evenly deposited.

  • Properties

    The NEDOX® process produces a hard, smooth and self-lubricating surface with high wear and corrosion protection. NEDOX® is extremely chemically resistant and has permanent anti-adhesion and anti-static properties. During the various process steps of the NEDOX® process, there are numerous variables that can be controlled to improve various surface properties. Over the years, Aalberts surface treatment has built up considerable know-how so that today many different coating variants of NEDOX® can be produced. Each of these variants has unique properties that meet or can be tailored to the needs of each application.

    Depending on the layer variant, the following properties are the most important, alone or in combination: anti-adhesion properties, resistance to UV radiation, chemical resistance, noise reduction, anti-friction properties, corrosion protection, protection against sticking of adhesive tape and glue, temperature resistance, wear protection.

  • base material

    NEDOX® is suitable for coating all low-alloyed ferritic steels, cast iron materials, stainless steels, non-ferrous metals such as copper, brass or bronze, aluminium alloys and sintered metal materials.

    The suitability of further materials for a NEDOX® treatment can be clarified through sample coatings.

  • Application

    Some NEDOX® variants are compliant with relevant food and commodity regulations (FDA, USDA, EC). As a result, they are suitable for applications where components are in direct or indirect contact with foods, eg. in the food industry or in the packaging sector.

    However, the fields of application of NEDOX® coatings are not limited to these two sectors, but are also found, for example, in the automotive industry, in energy technology (oil and gas), in the semiconductor industry, in the aerospace industry, in the pharmaceutical industry or in the field of pneumatics.

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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  • Anti-friction coatings

    Anti-friction coatings

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  • Electroplating

    Electroplating

    Metal layers are brilliant performances.

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  • Screw locking

    Screw locking

    Strong bonds

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    Screw locking

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