AURUNA® 311 For Technical Applications is a strongly acidic alloy electrolyte for the adhesive direct gold-plating of stainless steel. It is preferably used for...
For the adhesive direct gold-plating of stainless steel and nickel
AURUNA® 311 For Technical Applications is a strongly acidic alloy electrolyte for the adhesive direct gold-plating of stainless steel. It is preferably used for chromium-nickel steels, molybdenum steels and nickelbased alloys difficult to activate. Due to its strong activation effect, the electrolyte can be often used successfully as well for other passive materials difficult to plate.
The gold electrolyte is suitable for both strike gold layers and thick coatings in the technical field. The coatings are ductile, low in pores and protect against corrosion.
AURUNA® 311 For Technical Applications can be used for rack and barrel operation as well as in reel-to-reel plating (e.g. spray and dip cells and brush).
Electrolytes Characteristics
| Electrolyte type | Strongly acidic |
| Metal content | 2 (1 - 10) g/l Au |
| pH value | 0.6 (0.1 - 0.8) |
| Operating temperature | 25 (20 - 40) °C |
| Current density range | 2 - 6 A/dm² |
| Plating speed | 0.08 μm/min at 2 g/l Au, 2 A/dm² |
| Anode material | Pt-Ti, MMO (type PLATINODE® 177 ) |
Coating Characteristics
| Coating | Gold-cobalt |
| Alloy composition | Approx. 99.7 weight % Au 0.3 weight % Co |
| Colour of deposit | Deep yellow |
| Brightness | Bright |
| Hardness | 160 HV |
| Max. coating thickness | 10 μm |
Advantages
- Strongly acidic gold alloy electrolyte for the direct gold-plating of stainless steel and nickel
- Very good activation effect – without halogenides
- Low-pore, ductile and crack-free coatings
- Suitable for strike gold layers as well as for thick coatings
- Good throwing power
- The coatings are RoHS compliant
- Also available as a cobalt-free special version
- Suitable for rack, barrel and reel-to-reel plating
Applications
- Electrical contacts
- Stainless steel contacts
- Stainless steel springs
