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Business unit / dept.: Metal Deposition Solutions

AURUNA® 523 Hard Gold Electrolyte

AURUNA® 523 Hard Gold Electrolyte

Reduced gold consumption due to optimized layer thickness distribution

AURUNA® 523 is an innovative, weakly acidic hard gold electrolyte (AuNi) for technical applications. With a wide operating window, this process is ideal for rack, barrel and vibration coating systems, even for parts with complicated shapes.

The coatings produced are bright, hard and abrasion-resistant, which makes them ideal for electrical connecting elements, especially thanks to their consistently low contact resistance. In practice, coatings of AURUNA® 523 are also used as an intermediate layer under fine gold coatings for infrared reflectors, e.g. in epitaxy furnaces.

Electrolyte characteristics

Electrolyte type

weakly acidic

Metal content

4 (4 - 12) g/l Au, 1 (1 - 2) g/l Au as a strike gold

pH value

4.4 (4.2 - 4.6), 4.0 as a strike gold

Operating temperature

35 (30 - 45) °C

Current density range: Rack operation

1 (0.5 - 4.0) A/dm²

Current density range: Barrel operation

0.5 (0.3 - 2.0) A/dm²

Plating speed

0.1 - 0.8 μm/min

Coating characteristics

Coating

Gold-Nickel

Purity

approx. 99.7 wt. % Au, approx. 0.3 wt. % Ni

Colour of deposit

Yellow

Brightness

Bright, brilliant

Hardness of deposit

approx. 140 - 180 HV

Max. coating thickness

up to 10 μm

Advantages

  • Very good layer thickness distribution, even with complicated shaped parts
  • Wide operating range
  • Good abrasion resistance
  • Low, stable contact resistance

Applications

  • Contact springs
  • Printed circuit boards
  • Connectors
  • Infrared reflectors

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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