RH Family – Rhodium Plating
The RH family consists of rhodium plating baths with incomparable characteristics.
The properties of the deposit and its degree of whiteness make these plating baths a reference point for goldsmiths seeking unparalleled finishing excellence for their jewelry items.
They can be used for both flash plating and thickness plating applications.
They are particularly suitable for applications requiring an extremely white color, including use as a base for setting brilliant-cut diamonds.
The solutions can be deposited directly onto silver, palladium, gold, copper, nickel and nickel alloys.
For tin, lead, zinc, cadmium, aluminum and iron substrates, an intermediate deposit of nickel and gold is required before rhodium plating.
The RH family stands out for its excellent deposition efficiency, even at room temperature.
This makes it possible to reduce treatment times, operating temperatures and material consumption, resulting in increased productivity.
Table of contents
1. Main Benefits
Maximum process flexibility
Superior white color
Ideal for production processes involving objects with different shapes and geometries
Anti-burn technology
2. Deposit Data
Technical characteristics of the rhodium deposits obtained with the RH family plating solutions.
| Deposit Data | Value |
|---|---|
| Purity (%) | 99.9 |
| Hardness [HV 0.01] | 800 – 900 |
| Density [g/cm³] | 12.4 |
| Thickness [µm] | 0.02 – 0.20 |
| Appearance | Shiny |
| Color | White |
3. Product Form
Solution characteristics and storage information for the RH family.
| Product Form | Value |
|---|---|
| Metal concentration | 2 g Rh/L |
| Product pH | Acidic |
| Format | Ready-to-use liquid |
| Product color | Yellow – orange |
| Storage time | 2 years |
| Volume | 1 L |
4. Product Usage: RH2CT
Operating parameters for the RH2CT rhodium plating solution.
| Product Usage | Range | Optimal |
|---|---|---|
| Voltage [V] | 2 – 6 | 4 |
| Current density [A/dm²] | 0.5 – 10 | 3 |
| Working temperature [°C] | 18 – 50 | 25 – 30 |
| Treatment time [sec] | 20 – 60 | 40 |
| Cathodic efficiency [mg/Amin] | 3 – 12 | 6 |
| Anode/cathode ratio | 1:1 – 4:1 | 2:1 |
| Anode type | Ti/Pt | — |
| Stirring | Moderate | — |
5. Product Usage: RH2I / RH2M / RH2Z / RH2XL / RH2W
Common operating parameters for the five rhodium plating solutions RH2I, RH2M, RH2Z, RH2XL and RH2W.
| Product Usage | Range | Optimal |
|---|---|---|
| Voltage [V] | 2 – 6 | 3 |
| Current density [A/dm²] | 0.5 – 10 | 3 |
| Working temperature [°C] | 20 – 60 | 40 – 50 |
| Treatment time [sec] | 15 – 90 | 40 – 50 |
| Cathodic efficiency [mg/Amin] | 4 – 12 | 6 |
| Anode/cathode ratio | 1:1 – 4:1 | 2:1 |
| Anode type | Ti/Pt | — |
| Stirring | Moderate | — |