Attractive, appealing and elegant. This is as true for the night as well as for precious metals. Surface finishing with RHODUNA®-Alloy Black 1 allows you to transfer...
Bring the day the elegance of night
Attractive, appealing and elegant. This is as true for the night as well as for precious metals. Surface finishing with RHODUNA®-Alloy Black 1 allows you to transfer this elegance to your products - also at daytime.
The electrolyte deposits a dark precious metal alloy of rhodium and ruthenium with a noble anthracite hue - without color shift. The coatings produced are extremely resistant to abrasion and offer a price advantage of almost 50 percent (August 2019).
RHODUNA®-Alloy Black 1 finally makes your customers‘ desire for dark precious metal surfaces a reality.
Electrolytes Characteristics
| Electrolyte type | acidic |
| Metal content | 1.0 (0.8 - 1.2) g/l Rh 1.0 (0.8 - 1.2) g/l Ru |
| Operating temperature | 45 (40 - 50) °C |
| Current density range | 2.0 (0.5 - 5.0) A/dm² |
| Plating speed | Approx. 0.04 μm/min at 2.0 A/dm² |
Coating Characteristics
| Coating | Rhodium-Ruthenium |
| Alloy composition | 50 % Rh 50 % Ru |
| Colour of deposit | Anthracite |
| Brightness | Bright |
| Hardness | 600 - 900 HV |
| Max. coating thickness | 0.5 μm |
| Density of the coating | Approx. 12.4 g/cm³ |
Advantages
- Very dark anthracite with high color constancy
- Adjustable degree of blackness
- Gloss-preserving
- Uniform layer thickness
- Up to 0.5 μm crack-free
- Extremely abrasion resistant
- Large applicable current range
- Simple bath management
- Significantly cheaper than pure rhodium layers
- Base for deep black layers (RHODUNA® 471 Black)
Applications
- Accessories
- Jewelry
- Watches
- Eyeglasses
- Fittings
- Automobile interior
- Writing implements
- Contacts
