AURUNA® 527 Barrel Gold-Plating Electrolyte

Excellent Coating Thickness Distribution

AURUNA® 527 is a mildly acidic Gold-Nickel plating solution featuring excellent throwing power and highly uniform coating thickness distribution, especially on hollow components.

This makes the solution ideal for bulk material plating in barrel and vibration plating systems. The interior of housings or sockets often requires gold plating. The outstanding throwing power of the solution significantly improves thickness distribution between inner and outer surfaces, thereby saving gold consumption.

The resulting coating offers high wear resistance, low contact resistance, and impressive corrosion resistance.

Bath Characteristics

• Bath type: Mildly acidic.
• Metal content: 4 (2 – 5) g/l Gold.
• pH value: 4.4 (4.0 – 4.6).
• Operating temperature: Room temperature (20 °C to maximum 28 °C).
• Current density range: 0.3 (0.1 – 0.5) A/dm².
• Deposition rate: Approx. 0.05 (0.02 – 0.11) μm/min.

Coating Characteristics

• Coating: Gold-Nickel (containing approx. 0.15 wt.% Cobalt).
• Purity: Approx. 99.8% Gold.
• Deposit color: Pale yellow.
• Hardness: Approx. 150 HV 0.025.
• Density: Approx. 17.5 g/cm³.
• Standard classification: ASTM B 488-01 Type 1, Code C (equivalent to Type 1, Grade C according to military standard MIL-G-45204 C).

Advantages

• Gold saving due to optimal coverage on hollow components
• Outstanding throwing power
• Long-term stability during continuous operation
• Coating classified according to ASTM B-488-01: Type 1, Code C

Applications

• Bulk parts and barrel plated components
• Pins, springs, and plug contacts
• Contact sockets