RHODUNA® 471 Black gives jewelry a high-end anthracite to black finish. The level of darkness can be adjusted. The electrolyte is easy to use and the deposits...
Abrasion-resistant and crack-free dark layers
RHODUNA® 471 Black gives jewelry a high-end anthracite to black finish. The level of darkness can be adjusted. The electrolyte is easy to use and the deposits are sure to impress with good color consistency and brightness retention. Thanks to its good corrosion resistance, the electrolyte is ideal for applications where black ruthenium cannot meet abrasion requirements.
The electrolyte produces crack-free surfaces even in thicker layers. On a substrate, it is advisable to pre-coat with either gold or rhodium.
To achieve very dark results and perfect abrasion resistance, it is necessary to post-treat the coated parts with RHODUNA® 471 Black.
Electrolytes Characteristics
| Electrolyte type | acidic |
| Metal content | 2 (1.8 - 2.2) g/l Rh |
| pH value | 1.7 (1.0 - 2.0) |
| Operating temperature | 60 (55 - 65) °C |
| Current density range | 0.5 (0.25 - 2) A/dm² |
| Plating speed | 0.04 μm/min at 1,0 A/dm² |
| Anode material | Pt-Ti (type PLATINODE® Pt/Ti) |
Coating Characteristics
| Coating | Rhodium |
| Colour of deposit | Grey to anthracit (black) |
| Hardness of deposit | Depending on degress of blackening excellent to sufficient |
| Max. coating thickness | approx. 0.7 μm |
Advantages
- Perfect electrolyte for dark to black decorative layers
- High abrasion resistance
- Layers up to 0.7 μm possible
- Suitable for rack plating
Applications
- Jewelry
- Watches
- Spectacle frames
- Writing implements
- Accessories
