HARD GOLD ELECTROLYTE
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.
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
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ELECTROLYTE CHARACTERISTICS |
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COATING CHARACTERISTICS |
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Electrolyte type |
Weakly acidic |
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Coating |
Gold-Cobalt |
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Metal content |
8 (0.5 - 12) g/l Au |
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Alloy composition |
99.7 wt.% Au |
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pH value |
4.2 (3.8 - 4.6) |
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Colour of deposit |
Yellow |
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Operating temperature |
50 (48 - 52) °C |
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Brightness |
Bright |
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Current density range |
2.5 (1 - 5) A/dm² |
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Hardness of deposit |
150 - 220 HV |
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Plating speed |
0.1 - 1.0 μm/min |
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Max. coating thickness |
Crack-free up to |
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Anode material |
MMO (type PLATINODE 167 or 177) |
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Classification acc. to ASTM B-488- |
Type I-II, Code C-D |
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Solderability |
ZCT < 0.2 s |
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Density of the coating |
Approx. 17 g/cm³ |
