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  3. AURUNA® 311 Gold Cobalt Electrolyte

AURUNA® 311 Gold Cobalt Electrolyte

    Brand: UMICORE
    Origin:

    Germany
    028 3838 0482

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    For the adhesive direct gold-plating of stainless steel and nickel

    AURUNA® 311 is a strongly acidic alloy electrolyte for the adhesive direct gold-plating of stainless steel. It is preferably used for chromium-nickel steels, molybdenum steels and nickelbased alloys difficult to activate. Due to its strong activation effect, the electrolyte can be often successfully used as well for other passive materials difficult to plate.

    The gold electrolyte is suitable for both strike gold layers and thick coatings in the decorative field. The coatings are ductile, low in pores and protect against corrosion. The alloy electrolyte can be used for rack and barrel operation as well as in reel-to-reel plating (e.g. spray and dip cells and brush).

    AURUNA® 311 is also available as a cobalt-free special version.

    Electrolyte characteristics

    Electrolyte type

    Strongly acidic

    Metal content

    2 (1.0 - 2.5) rsp. 4 (3.5 - 4.5) g/l Au

    pH value

    0.6 (0.1 - 0.8)

    Operating temperature

    Room temperature up to max. 40 °C

    Current density range

    2 - 6 A/dm²

    Plating speed

    0.04 - 0.15 µm/min

    Anode material

    Pt-Ti, MMO (type PLATINODE® 177)

    Coating characteristics

    Coating

    Gold-cobalt

    Alloy composition

    0.3 weight % Co 99.7 weight % Au

    Colour of deposit

    Deep yellow

    Brightness

    Bright

    Hardness

    165 HV (HV 0.015 (Vickers) approx. values)

    Max. coating thickness

    Approx. 10 µm

    Density of the coating

    Approx. 17.5 g/cm³


    Advantages

    • Hard gold electrolyte for the direct gold-plating of stainless steel
    • Very good activation effect – without halogenides
    • Low-pore, ductile and crack-free coatings
    • Suitable for strike gold layers as well as for thick coatings
    • Good throwing power
    • Available as a cobalt-free special version
    • The coatings are RoHS compliant
    • Suitable for rack, barrel and reel-to-reel plating


    Applications

    • Household articles
    • Writing implements
    • Spectacle frames
    • Watches
    • Cutlery







    Umicore is a global materials technology and recycling group, with about 10,000 employees and a turnover of € 10.4 billion in 2015. Umicore generates the majority of its revenues and dedicates most of its R&D efforts to clean technologies, such as emission control catalysts, materials for rechargeable batteries and recycling. Umicore’s overriding goal of sustainable value creation is based on an ambition to develop, produce and recycle materials in a way that fulfils its mission: materials for a better life.

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    Umicore is a global materials technology and recycling group, with about 10,000 employees and a turnover of € 10.4 billion in 2015. Umicore generates the majority of its revenues and dedicates most of its R&D efforts to clean technologies, such as emission control catalysts, materials for rechargeable batteries and recycling. Umicore’s overriding goal of sustainable value creation is based on an ambition to develop, produce and recycle materials in a way that fulfils its mission: materials for a better life.