AURUNA® 556 EF-24 Fine Gold Electrolyte for Electroforming

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Electrolyte for fine gold hollow jewellery

AURUNA® 556 EF-24 is particularly suitable for electroforming. The electrolyte produces hard, semi-bright, thick gold layers. It is mainly used to produce high quality hollow jewellery with layers between 150 and 200 micrometer. Mandrels may be either made of wax or metal. The excellent hardness up to 200 HV and more than 99.9 percent fineness ensure customer satisfaction, because the hollow jewellery offers outstanding stability in use. It can be polished easily, has good surface quality and convinces with its solder properties.

AURUNA® 556 EF-24 is also ideal when thick fine gold layers are deposited on (non-) precious metals. Creative combinations allow completely new designs.

Electrolyte characteristics

Electrolyte type

Neutral

Metal content

12 (12 - 20) g/l Au

pH value

6 (5.8 - 6.2)

Operating temperature

45 °C

Current density range

0.5 A/dm²

Plating speed

0.23 μm/min

Deposition rate

85 - 90 mg/Amin

Anode material

Pt-Ti (type PLATINODE® Pt-Ti)

Coating characteristics

Coating

Fine gold

Purity

99.9 wt. % Au

Colour of deposit

Yellow

Brightness

Semi-bright

Hardness

200 HV

Max. coating thickness

Several 100 μm

Density of the coating

Approx. 19.0 g/cm³

 

Advantages

  • 24 ct fine gold electrolyte for electroforming
  • Suitable for wax and metal mandrels
  • Layer thicknesses between 150 and 200 micrometer
  • High hardness up to 200 HV at 99.9 percent fineness

 

Applications

  • Electroforming
  • Hollow jewellery
  • Noble jewellery







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.