Version: 10 April 2017 umicore Electroplating RHODUNA® DIAMOND BRIGHT RHODIUM ELECTROLYTE 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 pm 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. Applications • Jewellery • Watches • Spectacle frames • Writing implements • Technical applications (reed contact) Advantages • Ultra-bright coatings with previously unattained lightness and brilliance • Good covering speed • Minor porosity • Excellent throwing power • Layer thicknesses of up to 5 pm can be deposited • For rack and barrel plating • High abrasion resistance

RHODUNA® DIAMOND BRIGHT RHODIUM ELECTROLYTE TECHNICAL SPECIFICATIONS Electrolyte characteristics Strongly acidic Metal content Operating temperature Current density range Plating speed Pt-Ti (type PLATINODE® Pt/Ti) or MMO (type PLATINODE® 187) Anode material Coating Purity Hardness of deposit HV 0.015 (Vickers) approx. values Max. coating thickness Abrasion According to Bosch-Weinmann RHODUNA® Diamond Bright Thick Layers Commercially available technical rhodium electrolytes Abrasion of layers [mg/1000 strokes] Electrolyte type Coating characteristics Commercially available rhodium electrolytes...