RHODUNA®-Alloy Black 1 Rhodium-Ruthenium-Electrolyte
Bring the day the elegance of night
Attractive, appealing and elegant. This is as true for the night as well as for precious metals. Surface finishing with RHODUNA®-Alloy Black 1 allows you to transfer this elegance to your products - also at daytime.
The electrolyte deposits a dark precious metal alloy of rhodium and ruthenium with a noble anthracite hue - without color shift. The coatings produced are extremely resistant to abrasion and offer a price advantage of almost 50 percent (August 2019).
RHODUNA®-Alloy Black 1 finally makes your customers‘ desire for dark precious metal surfaces a reality.
Electrolyte characteristics
Electrolyte type acidic
Metal content 1.0 (0.8 - 1.2) g/l Rh 1.0 (0.8 - 1.2) g/l Ru
Operating temperature 45 (40 - 50) °C
Current density range 2.0 (0.5 - 5.0) A/dm²
Plating speed Approx. 0.04 μm/min at 2.0 A/dm²
Coating characteristics
Coating Rhodium-Ruthenium
Alloy composition 50 % Rh 50 % Ru
Colour of deposit Anthracite
Brightness Bright
Hardness 600 - 900 HV
Max. coating thickness 0.5 μm
Density of the coating Approx. 12.4 g/cm3
Advantages
Very dark anthracite with high color constancy
Adjustable degree of blackness
Gloss-preserving
Uniform layer thickness
Up to 0.5 μm crack-free
Extremely abrasion resistant
Large applicable current range
Simple bath management
Significantly cheaper than pure rhodium layers
Base for deep black layers (RHODUNA® 471 Black)
Applications
Accessories
Jewelry
Watches
Eyeglasses
Fittings
Automobile interior
Writing implements
Contacts
