AURUNA® 311 GOLD COBALT ELECTROLYTE FOR TECHNICAL APPLICATIONS


FOR TECHNICAL APPLICATIONS - GOLD COBALT ELECTROLYTE
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).
 
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







ELECTROLYTE CHARACTERISTICS

 

 


COATING CHARACTERISTICS

 

  Electrolyte type

Strongly acidic

 

Coating

Gold-cobalt

 Metal content

2 (1 - 10) g/l Au

 

Alloy composition

Approx.
99.7 weight % Au
0.3 weight % Co

pH value

0.6 (0.1 - 0.8)

 

Colour of deposit

Deep yellow

Operating temperature

25 (20 - 40) °C

 

Brightness

Bright

Current density range

2 - 6 A/dm²

 

Hardness of deposit
HV 0.015 (Vickers)
approx. values

160 HV

Plating speed

0.08 μm/min at
2 g/l Au, 2 A/dm²

 

Max. coating thickness

10 μm

Anode material

Pt-Ti, MMO (type PLATINODE    177)

   

 

 

     

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