AURUNA® 526 Barrel Gold-Plating Electrolyte

Excellent Layer Thickness Distribution

AURUNA® 526 is a weakly acidic gold-cobalt electrolyte with very good throwing power and layer thickness distribution, especially on hollow parts.

This makes the electrolyte perfect for use of bulk material in barrel and vibration coating facilities. The interiors of cases or sockets often need to be gold-plated. The excellent throwing power therefore very positively influences the layer thickness distribution between the interior and exterior surfaces. This optimum distribution means gold can be saved.

The deposited layers have very good wear resistance, low contact resistance and impressive corrosion resistance.

Electrolyte characteristics

Electrolyte type

Weakly acid

Metal content

4 g/l (2 - 5 g/l)

pH value

4.4 (4.0 - 4.6)

Operating temperature

Room temperature
(20 °C up to max. 30 °C)

Current density range

0.3 A/dm2 (0.3 - 1 A/dm²) barrel

Plating speed

approx. 50 mg (Amin)

Anode material

approx. 0.08 μm/min

Coating characteristics


Gold-cobalt (approx. 0.2 wt.% Co)


approx. 160 HV 0.01

Abrasion resistance

Very good

Contact resistance

approx. 2 mΩ


Type 1, Code C (equivalent to Type 1, Grade C in accordance with MIL-G-45204 C)


  • Save gold due to optimal coverage of hollow parts
  • Excellent throwing power
  • Long-term stability in permanent operation
  • Layers are classified in accordance with ASTM B-488-01: Type 1, Code C


  • Bulk and barrel parts
  • Pin, spring and plug contacts
  • Contact sockets
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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.