Electrolyte for abrasion-resistant, low-corrosion hard gold layers
AURUNA® 530 is a weakly acidic hard gold electrolyte with high current efficiency. Its essential property is its high resistance to abrasion and corrosion.
By choosing advantageous operating conditions (pH-value and temperature), printed circuit boards can be treated in a way which is particularly friendly to resists and lacquers, thus avoiding the lifting of masking materials.
With a gold content of at least 3 g/l, the desired high current efficiency can be reached even with sensitive resists. The plating speed is approx. 0.29 μm/min at 1 A/dm² and 35 °C.
Electroylytes Characteristics
| Electrolyte type | Weakly acidic |
| Metal content | 4 (3 - 6) g/l Au |
| pH value | 4.0 (4.0 - 4.4) |
| Operating temperature | 35 °C |
| Current density range | 0.8 A/dm² |
| Plating speed | 0.1 - 0.5 μm/min |
| Anode material | Pt-Ti (type PLATINODE® Pt/Ti) |
Coating Characteristics
| Coating | Gold-cobalt |
| Alloy composition | 99.7 wt.% Au, 0.3 wt.% Co |
| Colour of deposit | Yellow |
| Brightness | Semi-bright |
| Hardness | Approx. 170 HV |
| Density of the coating | Approx. 18 g/cm³ |
Advantages
- Weakly acidic hard gold electrolyte based on gold-cobalt with high current efficiency
- Good compatibility with resists, like dry film and soldermask
- Low contact resistance
- High abrasion resistance
- Good thickness distribution
- Easy maintenance and high stability of the electrolyte
- Low-pore layers with good corrosion resistance
Applications
- Contacts on plug-in cards
- Printed circuit boards
