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  3. MIRALLOY® For Costume Jewellery

MIRALLOY® For Costume Jewellery

    Brand: UMICORE
    Origin:

    Germany
    028 3838 0482

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    Copper-tin-(zinc) electrolytes as nickel-free alternatives

    MIRALLOY® has been offering alternative nickel-free plating for fashion jewellery since 1981. With MIRALLOY®, electrolytes are used to deposit copper-tin or copper-tin(-zinc) coatings in rack and barrel plating. Depending on the electrolyte used, white or yellow layers can be deposited.

    MIRALLOY® coatings stand out due to their excellent distribution of metal and, depending on the bath type, high tarnish resistance, levelling, abrasion resistance and exceptional corrosion resistance. A further plating layer with gold, rhodium, palladium or other precious metals, as well as tarnish protection if required, can be added with the right pre-treatment to create optimal corrosion protection.

    Electrolyte characteristics

    Electrolyte type

    Alkaline-cyanide

    Metal content

    10.5 g/l Cu 21.5 g/l Sn 1.6 g/l Zn

    pH value

    Alkaline

    Operating temperature

    60 °C

    Current density range

    0.5 A/dm²

    Plating speed

    Approx. 0.12 μm/ min at 0.5 A/dm²

    Anode material

    MMO (type PLATINODE® 167)

    Coating characteristics

    Coating

    Copper-tin-zinc

    Alloy composition

    85 wt. % Cu 10 wt. % Sn 5 wt. % Zn

    Colour of deposit

    2 N

    Brightness

    Bright

    Hardness

    400 HV

    Max. coating thickness

    20 μm

    Density of the coating

    8.4 g/cm³


    Advantages

    • Copper-tin-(zinc) alloy coatings of white or yellow colour
    • Diamagnetic
    • Nickel-free (§27 of REACH, Ann. XVII, Reg. (EC) No 1907/2006, Standard 100 by OEKO-Tex®)
    • Resistant to tarnishing and corrosion
    • Excellent layer thickness distribution
    • Can be lacquered
    • Can be combined with precious metals
    • Tried and tested process does not cause allergic reactions in the way that nickel does


    Applications

    • Costume jewellery
    • Ear studs / earrings
    • Necklaces
    • Bangles
    • Wrist watches






    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.