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 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




99.99 wt. % Rh

Colour of deposit





Approx. 800 - 900 HV

Max. coating thickness

Approx. 3 - 5 μm

Density of the coating

Approx. 12.4 g/cm³


  • 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


  • Jewellery
  • Watches
  • Spectacle frames
  • Writing implements
  • Technical applications (reed contact)

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Questions about the product?

Markus Legeler

+49 7171 607 204

For inquiries and additional information
please contact

Umicore AG & Co. KG
Rodenbacher Chaussee 4
63457 Hanau-Wolfgang

Tel.: +49 (6181) 59 6005
Fax: +49 (6181) 59 2970
Email: chemistry@umicore.com
Website: www.chemistry.umicore.com

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