RHODIUM-PLATINUM-ELECTROLYTE
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.
Advantages
• White and bright rhodium-platinum coatings
• Uniform layer thickness
• Crack-free up to 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
Applications
• Jewellery
• Watches
• Writing implements
• Eyeglasses
• Fittings
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ELECTROLYTE CHARACTERISTICS |
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COATING CHARACTERISTICS |
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Electrolyte type |
Strongly acidic |
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Coating |
Rhodium-platinum |
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Metal content |
1,5 (0,8 - 1,8) g/l Rh |
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Alloy composition |
50 % Rh |
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pH value |
< 1 |
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Colour of deposit |
White |
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Operating temperature |
45 (40 - 50) °C |
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Brightness |
Bright |
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Current density range |
3,0 (2,0 - 4,0) A/dm² |
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Max. coating thickness |
Approx. 800 - 900 HV |
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Plating speed |
Approx. 0,1 μm/min |
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Hardness of deposit |
Approx. 12.4 g/cm³ |
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Anode material |
MMO (type PLATINODE 187 SO) |
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Density of the coating |
Approx. 15,7 g/cm³ |
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