Cold Room Temperature Steel Blackening Agent
Cold room temperature steel blackening agent produces a black conversion coating on steel at ambient temperature (15-35°C) without the high-temperature caustic bath required for hot black oxide, using a selenium dioxide or copper selenide-based chemistry. The cold black finish is ideal for field application, large structures, and temperature-sensitive assemblies where hot processing is impractical. The resulting coating provides a decorative black appearance and, when sealed with oil or lacquer, offers acceptable corrosion protection for indoor applications.
Technical Specifications
| pH | 1.0-3.0 |
| appearance | Dark brown to black liquid concentrate |
| film appearance | Matte to satin black |
| active content (%) | ≥25 |
| process temperature (°C) | 15-35 |
Applications
- Field and on-site blackening of steel structures and fabrications
- Large or assembled components that cannot be tank processed
- Maintenance and touch-up blackening of existing finishes
- Decorative metalwork blackening without heat treatment
- Tooling and dies touch-up blackening after grinding
Key Features
- Ambient temperature process eliminates heating equipment cost
- Brush, spray, or immersion application for flexible processing
- Suitable for large structures and field repair applications
- Enhanced corrosion protection when sealed with oil or lacquer