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AURUNA® 5750 Gold Silver Electrolyte

AURUNA® 5750 Gold Silver Electrolyte

Yellowish-white coatings as a gold-saving intermediate layer

The AURUNA® 5750 electrolyte can be used to deposit approx. 12-carat gold-silver coatings (50 wt.% gold / 50 wt.% silver). These gold-saving coatings are characterised by their silver-like (yellowish-white) colour and good tarnish resistance. They are the ideal choice for saving gold and are mainly used as an intermediate layer under high-carat top coats. A major advantage is the exceptionally good ductility of the coatings, which ensures high flexibility and resilience. The electrolyte is easy to handle, insensitive to metallic impurities and is suitable for rack and barrel products.

A version with a low gold content (LC for ‘low content’) is available for thin layers. We also offer a cyanide-free form of the initial concentrate and the replenisher solution.

Electrolyte characteristics

Electrolyte type

Alkaline-cyanide

Metal content

5 (4.5 - 5.5) g/l Au, 3 (2.5 - 3.5) g/l Ag, LC version: 2 (1.7 - 2.3) g/l Au, 1.5 (1.3 - 1.7) g/l Ag

KCN content

80 (70 - 90) g/l

pH value

12 (11.7 - 12.3)

Operating temperature

35 (30 - 40) °C

Current density range

1.0 (0.8 - 1.2) A/dm², LC version: 0.6 (0.4 - 0.8) A/dm²

Plating speed

approx. 0.55 μm/min at 1.0 A/dm², LC version: approx. 0.3 μm/min at 0.6 A/dm²

Deposition rate

approx. 80 mg/Amin at 1.0 A/dm², LC version: approx. 74 mg/Amin at 0.6 A/dm²

Coating characteristics

Coating

Gold silver

Purity

approx. 50 wt.% Au, approx. 50 wt.% Ag

Colour of deposit

Yellowish-white

Brightness

Bright, brilliant

Hardness of deposit

approx. 220 HV

Max. coating thickness

approx. 3 μm, (approx. 1 μm in the LC version)

Density of the coating

approx. 14.2 g/cm³

Advantages

  • Gold-saving, 12-carat layers
  • Bright even in thick layers
  • Excellent ductility of the coatings
  • Simple electrolyte guidance
  • Suitable for rack and barrel plating
  • A version with a low gold content is available for thin layers
  • Good abrasion resistance

Applications

  • Jewelry
  • Connectors

Downloads

  • Produktblatt_AURUNA_5750_EN.pdf

Your contact person

Markus Legeler

Markus Legeler

Manager Sales International
T: +49 7171 607 204
F: +49 7171 607 316
Email

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