AURUNA® 503 Rose Gold Electrolyte

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Neutral, cadmium-free electrolyte for red layers

AURUNA® 503 is a neutral, cadmium-free gold-copper electrolyte for the deposition of bright red surfaces. It works without free cyanide.

AURUNA® 503 is especially suited to decorative but also technical applications, such as sliprings. Special features of this electrolyte are its long lifetime and fast deposition speed. For low-carat gold-saving layers, it also offers good resistance to corrosion and abrasion.

The gold-copper electrolyte can be used for rack and barrel plating and can achieve layers up to 5 μm in thickness.

 

Electrolyte characteristics

Electrolyte type

neutral

Metal content

6 (5 - 7) g/l Au 2.5 (2.0 - 3.0) g/l Cu

pH value

7.5 (7.3 - 7.8)

Operating temperature

65 (60 - 70) °C

Current density range

0.8 (0.6 - 1.2) A/dm²

Deposition rate

approx. 0.25 μm/min at 0.8 A/dm²

Anode material

Pt-Ti (type PLATINODE® Pt/Ti)

 

Coating characteristics

Coating

Gold Copper

Purity

75 wt.% Au 25 wt.% Cu

Colour of deposit

rose gold

Brightness

bright

Hardness of deposit

380 - 400 HV

Max. coating thickness

approx. 5 μm

Density of the coating

approx. 15 g/cm³

 

Advantages

  • Gold-saving coating (approx. 18ct)
  • Long lifetime
  • Fast deposition speed
  • Cadmium-free
  • Red gold-copper coatings
  • Resistant to tarnishing and corrosion
  • Maximum layer thickness approx. 5 μm
  • Very hard (380 - 400 HV), abrasion-resistant
  • Suitable for rack and barrel

 

Applications

  • Accessories
  • Jewelry
  • Watches
  • Bathroom fittings
  • Lighting
  • Spectacle frames
  • Writing utensils
  • Sliprings







Umicore is a global materials technology and recycling group, with about 10,000 employees and a turnover of € 10.4 billion in 2015. Umicore generates the majority of its revenues and dedicates most of its R&D efforts to clean technologies, such as emission control catalysts, materials for rechargeable batteries and recycling. Umicore’s overriding goal of sustainable value creation is based on an ambition to develop, produce and recycle materials in a way that fulfils its mission: materials for a better life.

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Umicore is a global materials technology and recycling group, with about 10,000 employees and a turnover of € 10.4 billion in 2015. Umicore generates the majority of its revenues and dedicates most of its R&D efforts to clean technologies, such as emission control catalysts, materials for rechargeable batteries and recycling. Umicore’s overriding goal of sustainable value creation is based on an ambition to develop, produce and recycle materials in a way that fulfils its mission: materials for a better life.