AURUNA® 5300 Gold Iron Electrolyte

Nickel-free, fast-depositing weakly acidic electrolyte

AURUNA® 5300 is a hard gold electrolyte free of nickel and cobalt with high plating speed for decorative and technical applications. The weakly acidic electrolyte for depositing yellow, bright hard gold coatings exhibits good corrosion and abrasion resistance. Its contact resistance is low and long-term stable. Metallic contaminants can be easily precipitated.

The hard gold electrolyte can be used for rack and barrel operation. It is especially suitable for jewellery since the coatings are free of nickel and cobalt.

Electrolyte characteristics

Electrolyte type

Weakly acidic

Metal content

8 (2 - 12) g/l Au
50 mg/l Fe

pH value

4.2 (4.0 - 4.5)

Operating temperature

45 (43 - 47) °C

Current density range

2 - 3 (1 - 4) A/dm²

Plating speed

0.2 - 1.0 μm/min

Anode material

Pt-Ti, MMO (type PLATINODE® 147)

Coating characteristics



Alloy composition

99.7 wt.% Au
0.3 wt.% Fe

Colour of deposit





150 - 170 HV

Max. coating thickness

Crack-free up to 20 μm

Density of the coating

Approx. 17.5 g/cm³


  • Weakly acidic hard gold electrolyte
  • Non-allergenic since free of nickel and cobalt
  • High plating speed
  • Yellow, bright coatings with approx. 0.3 % iron
  • For decorative and technical applications
  • Low, stable contact resistance
  • Good corrosion and abrasion resistance
  • The coatings are RoHS compliant
  • Suitable for rack and barrel


  • Accessories
  • Jewellery
  • Writing implements
  • Bathroom fittings
  • Lighting
  • Connectors/contacts
  • 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.