RHODUNA® Diamond Bright Rhodium Electrolyte Brilliant-white and ultra-bright rhodium coatings WEBSITE : https://mds.umicore.com/en/electroplating/products/product-finder/rhoduna-diamond-bright-rhodium-electrolyte 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)