AURUNA® 504 is an alkaline electrolyte for the deposition of red gold-copper alloy coatings with a caratage of 16 - 18 carat. The process, which is based on gold(I)...
Gold-saving gold-copper coatings for decorative and technical applications
AURUNA® 504 is an alkaline electrolyte for the deposition of red gold-copper alloy coatings with a caratage of 16 - 18 carat. The process, which is based on gold(I) cyanide and free cyanide, is suitable for both decorative and technical applications. It is characterized by high electrolyte stability and easy operation.
The layers are ultra-bright, highly ductile, hard and abrasion resistant. As low-carat gold-saving coatings, they also exhibit very good corrosion and tarnish resistance.
Electrolyte characteristics
| Electrolyte type | Alkaline |
| Metal content | 4 (3 - 5) g/l Au, 30 (28 - 32) g/l Cu |
| pH value | 11 (10.5 - 11.5) |
| Operating temperature | 68 (66 - 70) °C |
| Current density range: Rack operation | 0.7 (0.5 - 0.9) A/dm² |
| Current density range: Barrel operation | 0.25 (0.2 - 0.5) A/dm² |
| Plating speed | approx. 0.25 μm/min at 0.5 A/dm², approx. 0.34 μm/min at 0.7 A/dm², approx. 0.43 μm/min at 0.9 A/dm² |
| Deposition rate | approx. 68 mg/Amin at 0.7 A/dm² |
Coating characteristics
| Coating | Gold copper |
| Caratage | 16 - 18 carats |
| Purity | 67 - 75 wt.% Au, 25 - 33 wt.% Cu |
| Colour of deposit | Red |
| Brightness | Ultra-bright |
| Hardness of deposit | approx. 320 HV |
| Density of the coating | approx. 14 g/cm³ |
Advantages
- Gold-saving coatings (16 - 18 kt)
- High electrolyte stability
- Tarnish and corrosion resistant
- Hard, abrasion resistant coatings
- Highly ductile
Applications
- Jewelry
- Watches
- Accessories
- Bathroom fittings
- Lighting
- Spectacle frames
- Writing utensils
- Sliprings
