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Black Rhodium Electrolyte – Ready-to-Use Black Rhodium Plating Solution (2.0 g/L Rh)

Product information "Black Rhodium Electrolyte – Ready-to-Use Black Rhodium Plating Solution (2.0 g/L Rh)"

Black Rhodium Electrolyte 2 g/L – Ready-to-Use Black Rhodium Plating Solution

Premium black rhodium plating for jewellery, watches and decorative metal surfaces

The Black Rhodium Electrolyte containing 2.0 g/L rhodium is a ready-to-use electroplating solution designed to produce decorative dark anthracite-grey to black rhodium coatings. It is suitable for finishing jewellery, watches, eyewear frames, accessories and other compatible metal surfaces.

The resulting coatings combine an elegant dark appearance with high hardness. With a specified deposit hardness of 300–370 HV, this electrolyte is suitable for demanding decorative surface-finishing applications.

A major advantage is its ability to operate at room temperature. Within the recommended operating range of 20–27 °C, no time-consuming or energy-intensive bath heating is required under normal room-temperature conditions. This simplifies operation and helps reduce energy consumption.

The electrolyte can produce coatings with a maximum thickness of up to 0.5 µm.

Key Benefits

  • Ready-to-use black rhodium electrolyte containing 2.0 g/L rhodium

  • Elegant dark anthracite-grey to black finishes

  • Room-temperature operation without additional bath heating under suitable conditions

  • Time- and energy-saving process

  • High deposit hardness of 300–370 HV

  • Maximum coating thickness of up to 0.5 µm

  • Suitable for high-quality decorative metal finishes

  • Ideal for jewellery, watches, eyewear frames and accessories

  • Defined operating parameters for controlled plating processes

  • Ready to use without concentrate preparation

Applications

The Black Rhodium Electrolyte is particularly suitable for decorative finishing of:

  • Rings, necklaces, pendants and bracelets

  • Earrings and other jewellery

  • Watch cases and watch components

  • Eyewear frames

  • Luxury accessories and design objects

  • Compatible precious-metal surfaces

  • Appropriately pretreated metal surfaces

  • Decorative metal components and high-quality workpieces

It is suitable for applications in jewellery workshops, goldsmithing businesses, plating facilities and other compatible surface-finishing operations.

Technical Specifications

PropertySpecification
ProductBlack Rhodium Electrolyte
Rhodium concentration2.0 g/L Rh
pH value< 1
Electrolyte density1.02–1.07 g/cm³
Supply formReady to use

Recommended Operating Conditions

Process parameterRecommended value
Voltage2–3 V
Bath temperature20–27 °C
Exposure timeApprox. 2 minutes
Operating time range1–5 minutes
Anode materialMixed-metal oxide anodes or platinised titanium
Anode-to-cathode surface area ratio1:1
Current density1.0–1.5 A/dm²
Workpiece movementRequired
Deposition rateApprox. 6–8 mg/(A·min)
Bath filtrationRecommended for bath volumes of 10 litres and above

These values serve as recommended process parameters. The optimum settings depend on factors such as workpiece geometry, surface condition, anode arrangement and the desired colour intensity.

Properties of the Deposited Black Rhodium Coating

Deposit propertySpecification
ColourDark anthracite-grey to black
Hardness300–370 HV
Maximum coating thicknessUp to 0.5 µm
Deposit densityApprox. 10.5 g/cm³

The resulting surface offers an elegant, dark appearance and is particularly suitable for decorative applications where a strong contrast with lighter precious-metal finishes is desired.

The achievable colour intensity, coating uniformity and thickness depend on the surface pretreatment and compliance with the recommended operating conditions.

Surface Preparation and Processing

Proper workpiece preparation is essential for achieving a uniform coating with good adhesion.

Before plating, the surface should be thoroughly cleaned, degreased and activated using a process suitable for the specific base material. Residues, oxides, polishing compounds and other contaminants can adversely affect coating adhesion and appearance.

During plating, maintain the recommended voltage, temperature and current density. Workpiece movement is required to help maintain suitable plating conditions.

The recommended exposure time is approximately 2 minutes and can be adjusted within the specified range of 1–5 minutes according to the workpiece and desired finish.

Bath filtration is recommended for bath volumes of 10 litres or more.

Efficient Room-Temperature Operation

The Black Rhodium Electrolyte operates within a temperature range of 20–27 °C. When the bath is already within this range, additional heating is unnecessary.

This saves preparation time, reduces energy consumption and makes the electrolyte easier to integrate into existing electroplating workflows.

Supply Form

You receive a ready-to-use Black Rhodium Electrolyte containing 2.0 g/L rhodium. The solution is intended for use within the specified operating parameters and does not need to be prepared from a concentrate.

Black Rhodium Plating by Betzmann Galvanik

The Black Rhodium Electrolyte from Betzmann Galvanik allows compatible metal surfaces to be finished with a premium dark anthracite-grey rhodium coating. Its room-temperature operation, defined process parameters and deposit hardness of 300–370 HV make it an attractive solution for decorative jewellery finishing and professional surface treatment.

Betzmann Galvanik – electroplating products for high-quality surface finishing.

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Hazard statements

H314 Causes severe skin burns and eye damage.

H290 May be corrosive to metals. 

Precautionary statements 

P234 Keep only in original container.

P260 Do not breathe dust/fumes/gas/mist/vapors/spray. 

P280 Wear protective gloves/protective clothing/eye protection/face protection. 

P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

P303+P361+P353 IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. 

P363 Wash contaminated clothing before reuse.

P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.

P310 Immediately call a POISON CENTER/doctor/…/. 

P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. 

P310 Immediately call a POISON CENTER/doctor/…/. 

P390 Absorb spilled quantities to prevent material damage. 

P405 Store locked up. 

P406 Store in a corrosion-resistant container with a corrosion-resistant inner lining.

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