Our Black Oxide Finish Services
Deliver consistent black conversion coatings with 0.5-2.5μm thickness control. Our chemical processing lines handle parts up to 2m in length, offering three process variants:
Hot alkaline black oxide (140-150°C)
Mid-temperature (90-100°C)
Room temperature blackening
What is Black Oxide Finish?
A chemical conversion process where:
1.Ferrous metals react with alkaline oxidizers
2.Forms magnetite (Fe₃O₄) surface layer
3.Maintains precise part dimensions
Technical specifications:
Coating weight: 0.5-3.0 g/ft²
Salt spray resistance: 12-96 hours (with sealant)
Surface roughness: Ra ≤0.2μm change
| Surface Roughness |
Applicable Materials |
Cosmetic Availability |
Visual Appearance |
|---|
Black Oxide Advantages
- Dimensional Stability - Near-zero thickness buildup
- Reduced Light Reflectance - ≤5% gloss at 60°
- Enhanced Lubricity - 30% friction reduction
- Cost Efficiency - 60% cheaper than black plating
- Electrical Conductivity - Maintains EMI/RFI shielding
Notes
- Material restrictions: Only for ferrous metals
- Post-treatment: Oil/water displacement required
- Color variation: Dark gray to velvety black
Black Oxide Applications
- Firearms: Receiver components, barrels
- Automotive: Fasteners, brake components
- Aerospace: Tooling, ground support equipment
- Industrial: Gears, hydraulic cylinders
- Medical: Surgical instrument bodies
