Welding-Compatible Silver-Copper Anti-Tarnish Coating

a)       Exceptional Corrosion Resistance

Post-treatment, copper substrates demonstrate remarkable durability, enduring a 72-hour neutral salt spray test without discoloration. Silver components maintain integrity, showing no degradation when exposed to a 3% potassium sulfide solution for 5 minutes. Boasting superior anti-sulfidation and anti-oxidation properties compared to industry benchmarks, this protector is engineered for high-corrosion environments.

b)       Environmentally Certified & Operator-Safe Formulation

Leveraging an aqueous-based system, this non-toxic, non-irritant formula adheres to strict environmental regulations. Requiring no specialized personal protective equipment, it's ideal for safety-critical applications such as jewelry manufacturing and electronic connector production.

c)      Welding-Compatible Nanocoating

Featuring a nanometer-scale protective layer, this solution ensures zero interference with the welding performance and electrical conductivity of silver and copper surfaces. It meets the stringent requirements of electronic component interconnections, maintaining optimal contact resistance.

d)      Streamlined Operational Efficiency

Operational flexibility allows usage within the 45-55°C low-temperature range. A simple 3-10 minute immersion process forms a nanoscale uniform film, and post-treatment cleaning leaves no streaks, making it highly suitable for integration into automated manufacturing workflows.

e)      Robust Short-Term Thermal Protection

Pure copper components offer outstanding heat resistance. They retain integrity at 260°C for 20 minutes and withstand 300°C for 5 minutes without discoloration. While long-term thermal resilience is in R&D, it already meets short-term heat requirements of most industrial applications.

a)       Electronics Manufacturing

Optimized for copper-based components in PCB assemblies, electrical connectors, and terminals. Mitigates salt spray corrosion and thermal oxidation, ensuring consistent electrical performance and reliability.

b)       Jewelry Fabrication

Engineered to safeguard silver and copper alloy jewelry against sulfur-induced tarnishing. Protects against environmental contaminants and perspiration, preserving the aesthetic integrity of precious metal items.

c)       Industrial Engineering

Ideal for copper heat exchangers, motor windings, and precision instrument components. Maintains material integrity in corrosive environments,  reducing downtime and lifecycle maintenance costs.

d)       Architectural Hardware

Enhances the durability of silver-copper alloy decorative elements and bathroom fixtures. The protective coating improves weather resistance, ensuring long-term preservation of surface finish quality.

1.       Solution Preparation:

• Thoroughly clean the plating tank, add 75% of the volume of pure water, and heat it to the operating temperature (55℃ is recommended).

• Slowly add the 289-10 protector (at a concentration of 100ml/L), stir evenly, then add pure water to the standard volume, and reheat to the operating temperature.

2.       Workpiece Treatment Process:

• Pretreatment of workpieces: Soak for degreasing and cleaning, then rinse with pure water 3 times.

• Activation treatment (optional): Immerse in a 0.5 - 1% nitric acid solution for 0.5 - 1 minute (suitable for silver workpieces).

• Protective film formation: Soak in the working solution at 55℃ for 5 minutes, take out and rinse with 35 - 40℃ hot pure water.

• Drying treatment: Spin dry (barrel plating) or dry in an oven (rack plating), and pack for delivery after cooling at room temperature.

3.       Maintenance Points:

• Regularly monitor the concentration with a surface active substance detector, and supplement according to the formula (for every 100L, the supplement amount = (10% - measured concentration) × 100L).

• Replace the working solution in time when it is seriously contaminated. If it becomes viscous during storage at room temperature, it can be melted in a 40 - 50℃ water bath before use.