Black Nickel Electroplating: Sulfur Chemical Immersion and Sealant Layers
Engineering Overview: Process breakdown of Black Nickel electroplating on brass lock cylinders, detailing nickel-zinc-sulfide alloy deposition and protective clear coats.
Technical & Engineering Specifications
| Substrate | Solid H59 Extruded Brass |
|---|---|
| Salt Spray | ASTM B117 144 hours |
| Application | Modern Architectural & High-End Residential |
| Finish Code | Black Nickel / Gun Black |
| Plating Stack | Bright Nickel (12um) + Black Ni-Zn Strike (1.5um) + Lacquer |
Black Nickel Chemistry
Black Nickel (BN / Gun Black) delivers an elegant deep metallic black finish with gunmetal undertones, distinct from matte powder coats.
Electroplating Process
- Bright Nickel Base: 12 μm standard bright nickel base layer for corrosion resistance.
- Black Nickel Alloy Strike: Electroplated from a specialized bath containing nickel sulfate, zinc sulfate, and sodium thiocyanate, depositing a thin metallic Nickel-Zinc-Sulfide alloy layer.
- Thermosetting Lacquer: Sealed with baked clear polyurethane lacquer to provide ASTM B117 salt spray endurance of 144+ hours.
Frequently Asked Engineering & Selection Questions
Q1: What gives black nickel its distinctive metallic black color?
A co-deposited alloy of nickel, zinc, and sulfide plated over a bright nickel base, sealed with clear lacquer.