Brilliant-white and ultra-bright rhodium coatings
RHODUNA® Diamond Bright deposits brilliant-white, ultra-bright coatings of previously unattained lightness and brilliance. It is additionally characterized by high covering speed and excellent throwing power. Furthermore the RHODUNA® Diamond Bright layer thicknesses of up to 5 μm can be deposited crack-free.
Rhodium can be directly deposited on silver, gold, copper and copper alloys, nickel and nickel alloys. The layers are extremly low-porous and therefore very corrosion resistant.
Electrolyte characteristics
Electrolyte type Strongly acidic
Metal content 2 (1.6 - 3.0) g/l Rh
pH value < 1
Operating temperature 40 (RT - 65) °C
Current density range 1 - 2 (0.5 - 10) A/dm²
Plating speed 0.08 μm/min at 1 A/dm² 0.10 μm/min at 2 A/dm²
Anode material Pt-Ti (type PLATINODE® Pt/Ti) or MMO (type PLATINODE® 187)
Coating characteristics
Coating Rhodium
Purity 99.99 wt. % Rh
Colour of deposit Brilliant-white
Brightness Ultra-bright
Hardness Approx. 800 - 900 HV
Max. coating thickness Approx. 3 - 5 μm
Density of the coating Approx. 12.4 g/cm³
Advantages
Ultra-bright coatings with previously unattained lightness and brilliance
Good covering speed
Minor porosity
Excellent throwing power
Layer thicknesses of up to 5 μm can be deposited
For rack and barrel plating
High abrasion resistance
Applications
Jewellery
Watches
Spectacle frames
Writing implements
Technical applications (reed contact)
