AURUNA® 530 Gold Cobalt Electrolyte

Electrolyte for abrasion-resistant, low-corrosion hard gold layers

AURUNA® 530 is a weakly acidic hard gold electrolyte with high current efficiency. Its essential property is its high resistance to abrasion and corrosion.

By choosing advantageous operating conditions (pH-value and temperature), printed circuit boards can be treated in a way which is particularly friendly to resists and lacquers, thus avoiding the lifting of masking materials.

With a gold content of at least 3 g/l, the desired high current efficiency can be reached even with sensitive resists. The plating speed is approx. 0.29 μm/min at 1 A/dm² and 35 °C.

Electrolyte characteristics

Electrolyte type

Weakly acidic

Metal content

4 (3 - 6) g/l Au

pH value

4.0 (4.0 - 4.4)

Operating temperature

35 °C

Current density range

0.8 A/dm²

Plating speed

0.1 - 0.5 μm/min

Anode material

Pt-Ti (type PLATINODE® Pt/Ti)

Coating characteristics



Alloy composition

99.7 wt.% Au, 0.3 wt.% Co

Colour of deposit





Approx. 170 HV

Density of the coating

Approx. 18 g/cm³


  • Weakly acidic hard gold electrolyte based on gold-cobalt with high current efficiency
  • Good compatibility with resists, like dry film and soldermask
  • Low contact resistance
  • High abrasion resistance
  • Good thickness distribution
  • Easy maintenance and high stability of the electrolyte
  • Low-pore layers with good corrosion resistance


  • Contacts on plug-in cards
  • Printed circuit boards

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Questions about the product?

Markus Legeler

+49 7171 607 204

For inquiries and additional information
please contact

Umicore AG & Co. KG
Rodenbacher Chaussee 4
63457 Hanau-Wolfgang

Tel.: +49 (6181) 59 6005
Fax: +49 (6181) 59 2970

The information and statements contained herein are provided free of charge. They are believed to be accurate at the time of publication, but Umicore makes no warranty with respect thereto, including but not limited to any results to be obtained or the infringement of any proprietary rights. Use or application of such information or statements is at the user´s sole discretion, without any liability on the part of Umicore. Nothing herein shall be construed as a license or recommendation for use, which infringes upon any proprietary rights. All sales are subject to Umicore´s General Conditions of Sale and Delivery.