High-Speed Electrolyte for Hard Gold Deposition
AURUNA® 7000 is used for depositing hard gold coatings in special high-speed equipment. The weakly acidic electrolyte has a wide operating range with easy bath maintenance and high plating speed. No oxidation of the alloy partner iron.
AURUNA® 7000 was specifically developed for the automatic high-speed gold-plating in equipment for selective plating and continuously working reel-to-reel lines. Due to vigorous electrolyte agitation (flow, spray), it allows the working at high current densities with stable long-time behaviour. It can be also operated as a gold strike electrolyte.
The deposits are solderable, low in pores, ultra-bright, hard and abrasion-resistant. They have a constantly low contact resistance. Therefore the electrolyte is excellently suitable for the gold-plating of electronic components such as connectors, contacts and edge connectors on printed circuit boards.
Electrolyte characteristics
Electrolyte type Weakly acidic
Metal content 12 (2 - 18) g/l Au
pH value 4.2 - 4.6
Operating temperature 55 (45 - 60) °C
Current density range 2 - 40 A/dm²
Plating speed 0.3 - 8.0 μm/min
Anode material Pt-Ti (type PLATINODE® Pt/Ti)
Coating characteristics
Coating Gold-Iron
Alloy composition Approx. 99.7 wt. % Au, 0.1 - 0.4 wt. % Fe
Colour of deposit Yellow
Brightness Ultra-bright
Hardness of deposit 170 - 200 HV
Max. coating thickness 10 μm
Density of the coating Approx. 17 g/cm³
Advantages
For use in high-speed equipment
No oxidation of the alloy partner iron
High plating speed
Low-pore, solderable, hard and abrasion-resistant coatings
ASTM B-488-01, Type I-II, Code C-D
The coatings are RoHS compliant
Applications
Connectors
Electrical contacts
Edge connectors of printed circuit boards
