Engineering guide to electroplating brass components — Bright Nickel, Electroless Nickel (ENP), Tin, Chrome, Gold, Silver, Acid Passivation, and ASTM B117 salt spray tests.
Surface finishing protects brass components from oxidation, dezincification, and mechanical wear while providing required aesthetic or electrical properties. Electroplated nickel (ISO 1456) and Electroless Nickel (ENP - MIL-C-26074E) provide uniform barrier protection against harsh atmospheric moisture and corrosive industrial chemicals.
| Plating Finish | Thickness Class | Specification Code | Salt Spray Hours (ASTM B117) | Primary Industrial Benefit |
|---|---|---|---|---|
| Bright Electro-Nickel | 3 – 15 μm | ISO 1456 / ASTM B689 | 48 – 96 Hours | Corrosion barrier, decorative shine, wear resistance. |
| Electroless Nickel (ENP) | 5 – 25 μm | MIL-C-26074E | 100 – 240 Hours | Uniform coating inside blind bores, high hardness (500+ HV). |
| Matte / Bright Tin | 5 – 12 μm | ASTM B545 | 24 – 48 Hours | Excellent solderability for electrical terminals & PCB pins. |
| Silver Plating | 3 – 10 μm | ASTM B700 | 24 Hours | Maximum electrical conductivity for high-voltage switchgear. |
| Natural Acid Passivation | Clean Metal Surface | ASTM B600 | 24 Hours | Removes free iron contamination, bright golden finish. |
