Neutral, cadmium-free electrolyte for red layers
AURUNA® 503 is a neutral, cadmium-free gold-copper electrolyte for the deposition of bright red surfaces. It works without free cyanide.
AURUNA® 503 is especially suited to decorative but also technical applications, such as sliprings. Special features of this electrolyte are its long lifetime and fast deposition speed. For low-carat gold-saving layers, it also offers good resistance to corrosion and abrasion.
The gold-copper electrolyte can be used for rack and barrel plating and can achieve layers up to 5 μm in thickness.
Electrolyte characteristics
| Electrolyte type | neutral |
| Metal content | 6 (5 - 7) g/l Au 2.5 (2.0 - 3.0) g/l Cu |
| pH value | 7.5 (7.3 - 7.8) |
| Operating temperature | 65 (60 - 70) °C |
| Current density range | 0.8 (0.6 - 1.2) A/dm² |
| Deposition rate | approx. 0.25 μm/min at 0.8 A/dm² |
| Anode material | Pt-Ti (type PLATINODE® Pt/Ti) |
Coating characteristics
| Coating | Gold Copper |
| Purity | 75 wt.% Au 25 wt.% Cu |
| Colour of deposit | rose gold |
| Brightness | Bright |
| Hardness of deposit | 380 - 400 HV |
| Max. coating thickness | approx. 5 μm |
| Density of the coating | |
Advantages
- Gold-saving coating (approx. 18ct)
- Long lifetime
- Fast deposition speed
- Cadmium-free
- Red gold-copper coatings
- Resistant to tarnishing and corrosion
- Maximum layer thickness approx. 5 μm
- Very hard (380 - 400 HV), abrasion-resistant
- Suitable for rack and barrel
Applications
- Accessories
- Jewelry
-Watches
- Bathroom fittings
- Lighting
- Spectacle frames
- Writing utensils
- Sliprings
