AURUNA® 5400 Hard Gold Electrolyte

AURUNA® 5400 Hard Gold Electrolyte

For Depositing Uniformly Bright Coatings

AURUNA® 5400 the weakly acidic electrolyte deposits yellow, uniform bright hard gold coatings. The newly balanced brightener system of the electrolyte enables the operation in a very wide current density working range and allows a variable gold content at the same time. Due to the usage of special chemical components, the AURUNA® 5400 is equally suitable for rack and barrel application.

The deposited coatings are characterized by low porosity and an increased abrasion resistance, compared to coatings deposited in AURUNA® 539. Furthermore contacts coated with AURUNA® 5400 exhibit a low and long-time stable contact resistance and an excellent solderability. As well coatings up to 10 μm can be crack-free depositied in the electrolyte.

Electrolyte characteristics

Electrolyte type

Weakly acidic

Metal content

8 (0.5 - 12) g/l Au

pH value

4.2 (3.8 - 4.6)

Operating temperature

50 (48 - 52) °C

Current density range

2.5 (1 - 5) A/dm²

Plating speed

0.1 - 1.0 μm/min

Anode material

MMO (type PLATINODE® 167 or 177)

Coating characteristics



Alloy composition

99.7 wt.% Au 0.3 wt.% Co

Colour of deposit




Hardness of deposit

150 - 220 HV

Max. coating thickness

Crack-free up to 10 μm

Density of the coating

Approx. 17 g/cm³


Type I-II, Code C-D (equivalent to IC-IID according to MIL-G-45204C)


ZCT < 0.2 s


  • Very wide operating current density range
  • For technical and decorative applications
  • High corrosion and abrasion resistance
  • Low, stable contact resistance
  • Classification according to ASTM B 488-01: Type I - II, grade C -D


  • Contact pins, contact springs, contact plugs
  • Contact materials
  • Slip rings


  • Produktblatt-auruna-5400-en-screen-20190416.pdf

Your contact person

Markus Legeler

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

Find a representative in your region


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