With RHODUNA® 275 Black, selective rhodium plating is possible with a pen plating unit. Small surface elements of components are rhodium-plated using direct...
Pen rhodium plating for black bright coatings
With RHODUNA® 275 Black, selective rhodium plating is possible with a pen plating unit. Small surface elements of components are rhodium-plated using direct current and by wiping contact with the tip of the pen. The process is mainly used to apply decorative patterns to jewelry.
RHODUNA® 275 Black deposits bright and anthracite to black coatings. Depending on the voltage, values in the L*a*b* color space of 61.0 / 1.1 / 4.0 (at 10 V) are possible, while providing typical coating thicknesses of around 0.1 μm. RHODUNA® 275 Black is formulated to deliver fast coverage speed and high deposition efficiency.
The electrolyte can also be used for rack operation.
Electrolytes Characteristics
| Electrolyte type | Strongly acidic |
| Metal content | 2 g Rh / 100 ml |
| pH value | < 1 |
| Operating temperature | Room temperature (20 - 40 °C) |
| Voltage | 8 - 10 volts (max. 12 volts) |
| Plating speed | Up to 0.1 μm/min |
Coating Characteristics
| Coating | Rhodium |
| Purity | 99.9 wt.% Rh |
| Colour of deposit | anthracite to black L*a*b* color range: 61.0 / 1.1 / 4.0 (at 10 V) |
| Brightness | Bright, brilliant |
| Hardness of deposit | approx. 600 HV |
| Max. coating thickness | approx. 0.1 μm |
| Density of the coating | approx. 12 g/cm³ |
Advantages
- Bright anthracite to black rhodium coatings
- Uniform coating thickness
- Crack-free up to 0.1 μm
- Easy handling
- Fast coverage speed
- High deposition rate
Applications
- Jewelry
- Watches
- Writing implements
- Spectacle frames
- Fittings
