AURUNA® 502 Rose Gold Electrolyte
Neutral, cadmium-free electrolyte for red layers
AURUNA® 502 is a neutral, cadmium-free gold copper electrolyte working without free cyanide. The red surfaces are bright, very hard and abrasion-resistant.
AURUNA® 502 is mainly used for decorative coatings, but it is suitable for technical applications such as slip rings as well. As gold-saving, low-carat layers, the surface exhibits very good corrosion and tarnish resistance.
The gold copper electrolyte can be used for rack and barrel plating, it can deposit layers of up to max. 10 μm in thickness.

Electrolyte characteristics
Electrolyte type
Neutral
Metal content
4 (3.5 - 4.5) g/l Au
3 (2.5 - 3.5) g/l Cu
pH value
7.5 (7.2 - 8.0)
Operating temperature
57 (55 - 60) °C
Current density range
0.5 (0.3 - 0.8) A/dm²
Plating speed
Approx. 0.15 μm/min at 0.5 A/dm²
Anode material
Pt-Ti (type PLATINODE® Pt/Ti)
Coating characteristics
Coating
Gold-copper
Alloy composition
75 wt.% Au
25 wt.% Cu
Colour of deposit
Red
Brightness
Bright
Hardness
380 - 400 HV
Max. coating thickness
Approx. 10 μm
Density of the coating
Approx. 15 g/cm³
Advantages
- Gold-saving coatings (approx. 18 ct)
- Cadmium-free
- Red gold-copper layers
- Resistant to tarnishing and corrosion
- Maximum layer thickness approx. 10 μm
- High hardness (380 - 400 HV), abrasion-resistant
- Suitable for rack and barrel
Applications
- Accessories
- Jewellery
- Watches
- Bathroom fittings
- Lighting
- Spectacle frames
- Writing implements
- Slip rings
For inquiries and additional information
please contact
Umicore AG & Co. KG
Rodenbacher Chaussee 4
63457 Hanau-Wolfgang
Germany
Tel.: +49 (6181) 59 6005
Fax: +49 (6181) 59 2970
Email: chemistry@umicore.com
Website: www.chemistry.umicore.com
The information and statements contained herein are provided free of charge. They are believed to be accurate at the time of publication, but Umicore makes no warranty with respect thereto, including but not limited to any results to be obtained or the infringement of any proprietary rights. Use or application of such information or statements is at the user´s sole discretion, without any liability on the part of Umicore. Nothing herein shall be construed as a license or recommendation for use, which infringes upon any proprietary rights. All sales are subject to Umicore´s General Conditions of Sale and Delivery.