Imprint RHODUNA® PT Rhodium-Platinum-Electrolyte | Umicore

RHODUNA® PT Rhodium-Platinum-Electrolyte

RHODUNA® PT Rhodium-Platinum-Electrolyte

Irresistible – Rhodium with the allure of platinum

Rhodium creates a brilliant white surface on decorative products. Platinum has enjoyed an incredibly stable price for a number of years, and its name is desirable for all buyer groups. Imagine an alloy that combines the benefits of both precious metals.

A RHODUNA® PT layer is built up of rhodium and platinum one half each, notwithstanding that the high-quality alloy can not be distinguished from that of a pure rhodium electrolyte, even with a trained eye. Due to the high societal significance of platinum, your product also gains in psychological value and its price acceptance increases significantly – conversely, for you as a producer a coating with RHODUNA® PT is more attractively in price than that with a pure rhodium electrolyte.

Alternatively, the alloy composition of rhodium and platinum can be variably adjusted. Compositions of 80 % platinum to 20 % rhodium, and vice versa, are possible - and all this with constant layer properties. Therefore you always have the price advantage on your side.

Further information

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

0,6 - 1,5 g/l Rh, 0,6 - 1,5 g/l Pt

pH value

< 1

Operating temperature

45 (40 - 50) °C

Current density range

3,0 (2,0 - 4,0) A/dm²

Plating speed

ca. 0,1 μm/min 3 A/dm²

Anode material

MMO (type PLATINODE® 187 SO)

Coating characteristics



Alloy composition

20 - 80 % Rh, 20 - 80 % Pt

Colour of deposit




Hardness of deposit

600 HV (at 50 % Rh and 50 % Pt)

Max. coating thickness

up to 0,3 μm

Density of the coating

Approx. 15,7 g/cm³ (at 50 % Rh and 50 % Pt)


  • White and bright rhodium-platinum coatings
  • Uniform layer thickness
  • Crack-free up to 0,3 μm
  • Wide current density range
  • Abrasion-resistant
  • Less expensive than pure rhodium layers
  • Minor porosity and good throwing power
  • Good covering speed
  • For rack and barrel plating


  • Jewellery
  • Watches
  • Writing implements
  • Eyeglasses
  • Fittings


  • Produktblatt_RHODUNA_PT_EN_Screen.pdf

Your contact person

Markus Legeler

Manager Sales International
T: +49 7171 607 204
F: +49 7171 607 316

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