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Hard Gold Bath, Prod-ID: NC220

Hard Gold Cobalt Bath NC220


NC220 the weakly acidic electrolyte is suitable for an uniform bright, yellow, hard gold (Gold-Cobalt) and crack free coatings up to 10 micron.
Due to the usage of special chemical components, the NC220 is equally suitable for rack and barrel application.
The precious metal content of the gold layer is approx. 23ct.

Gold content: 3, 5, 8 and 12  g/L

Catalogue catalog


Very wide operating current density range

For technical and decorative applications

High corrosion and abrasion resistance


Electronic and communication industries

Cosmetic Packaging

Writing Utensils

Jewelry & Spectacle Frames

Bathroom Fittings

Clothing Accessories

Technical Specifications

Electrolyte characteristics

Electrolyte type Weakly acidic
Metal content 3, 5, 8, 12 g/L Au
pH value 4.2 (3.8 - 4.6)
Operating temperature 30 (20 - 40) °C
Current density range 2.5 (1-5) A/dm2
Plating speed 0.15 μm/min
Anode material MMO (RuO2-TiO2) or Pt-Ti

Coating Characteristics

Coating Gold-Cobalt
Alloy composition 99.7 wt. % Au, 0.3 wt. % Co
Color of deposit Yellow
Brightness Bright
Hardness of deposit 150 - 220 HV
Max. Coating Thickness Crack free up to 10 μm
Density of the coating Approx. 17 g/cm3