Arsenic-free electrolyte for fine gold hollow jewellery
AURUNA® 5500 EF is particularly suitable for electroforming. The electrolyte is free of arsenic and 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 180 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® 5500 EF 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
16 (12 - 20) g/l Au
pH value
5.5 (5.0 - 6.0)
Operating temperature
40 (35 - 45) °C
Current density range
0.5 A/dm²
Plating speed
Approx. 0.3 μm/min at 0.5 A/dm²
Deposition rate
Approx. 110 mg/Amin
Anode material
MMO (Typ PLATINODE® 187 SO)
Current efficiency
Approx. 90 %
Coating characteristics
Coating
Fine gold
Caratage
24 carats
Purity
99.9 wt. % Au
Colour of deposit
Yellow
Brightness
Semi-bright
Hardness
Approx. 180 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 180 HV at 99.9 percent fineness
Applications
Electroforming
Hollow jewellery
Noble jewellery
