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...
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.
Electrolytes 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
| Coating | Gold-Cobalt |
| Alloy composition | 99.7 wt.% Au 0.3 wt.% Co |
| Colour of deposit | Yellow |
| Brightness | Bright |
| Hardness of deposit | 150 - 220 HV |
| Max. coating thickness | Crack-free up to 10 μm |
| Density of the coating | Approx. 17 g/cm³ |
| Classification | Type I-II, Code C-D (equivalent to IC-IID according to MIL-G-45204C) |
| Solderability | ZCT < 0.2 s |
Advantages
- 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
Applications
- Contact pins, contact springs, contact plugs
- Contact materials
- Slip rings
