Skip to main content Skip to primary navigation

PLATUNA® Alloy RH Platinum Rhodium Electrolyte

PLATUNA® Alloy RH Platinum Rhodium Electrolyte

Abrasion-resistant platinum-rhodium layers for sparkling jewelry

With the strongly acidic alloy electrolyte PLATUNA®-Alloy RH, smooth, bright and crack-free platinum-rhodium coatings can be deposited up to a layer thickness of 0.5 μm. The deposited coatings are characterized by a brilliant luster and, in contrast to conventional platinum coatings, do not exhibit a yellow tint.

An important advantage of the coating is the high hardness due to the rhodium content. Furthermore, the electrolyte has a low sulfuric acid content and is therefore less aggressive to the coating substrate. The deposition rate is independent of the current density, which leads to an optimum layer thickness distribution. No precipitation occurs and the platinum concentrate does not have to be stored in the refrigerator.

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

1.2 (0.8 - 1.6) g/l Pt, 0.3 (0.2 - 0.4) g/l Rh

pH value

< 1

Operating temperature

60 (55 - 65) °C

Current density range

5 (0.5 - 10) A/dm²

Plating speed

approx. 0.12 μm/min at 5 A/dm²

Deposition rate

approx. 4.7 mg/Amin at 5 A/dm²

Coating characteristics


Platinum rhodium

Alloy composition

approx. 80 % Pt, approx. 20 % Rh

Colour of deposit



Bright, brilliant


not measurable, approx. 600 HV

Max. coating thickness

approx. 0.5 μm

Density of the coating

approx. 18.7 g/cm³


  • Excellent brillance without yellow tint
  • Longer durability
  • High abrasion resistance
  • Current density independent
  • Easy handling - no cold storage and no precipitation


  • Jewelry
  • Watches
  • Writing implements
  • Spectacles frames
  • Bathroom fittings


  • Produktblatt_PLATUNA_Alloy_RH_EN.pdf

Your contact person

Markus Legeler

Markus Legeler

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

Find a representative in your region

Our sustainability commitment

Confirmed by EcoVadis