GOLD COBALT ELECTROLYTE
AURUNA® 311 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 successfully used as well for other passive materials difficult to plate. The gold electrolyte is suitable for both strike gold layers and thick coatings in the decorative field. The coatings are ductile, low in pores and protect against corrosion. The alloy electrolyte can be used for rack and barrel operation as well as in reel-to-reel plating (e.g. spray and dip cells and brush). AURUNA® 311 is also available as a cobalt-free special version.
Advantages
• Hard gold electrolyte for the direct gold-plating of stainless steel
• 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
• Available as a cobalt-free special version
• The coatings are RoHS compliant
• Suitable for rack, barrel and reel-to-reel plating
Applications
• Household articles
• Writing implements
• Spectacle frames
• Watches
• Cutlery
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ELECTROLYTE CHARACTERISTICS |
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COATING CHARACTERISTICS |
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Electrolyte type |
Strongly acidic |
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Coating |
Gold-cobalt |
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Metal content |
2 (1.0 - 2.5) rsp. 4 (3.5 - 4.5) g/l Au |
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Alloy composition, approx. values |
0.3 weight % Co 99.7 weight % Au |
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pH value |
0.6 (0.1 - 0.8) |
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Colour of deposit |
Deep yellow |
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Operating temperature |
Room temperature |
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Brightness |
Bright |
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Current density range |
2 - 6 A/dm² |
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Hardness of deposit |
165 HV |
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Plating speed |
0.04 - 0.15 μm/min |
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Max. coating thickness |
Approx. 10 μm |
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Anode material |
Pt-Ti, MMO (type PLATINODE 177) |
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Density of the coating |
Approx. 17.5 g/cm³ |
