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.
Electrolytes 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
