Black Chromate Passivation Agent
Black chromate passivation agent produces a uniform, decorative black chromate conversion coating on electroplated zinc substrates, combining aesthetic appeal with good corrosion protection. The black film is achieved through the incorporation of silver or cobalt ions into the classic hexavalent chromate formulation. It is widely used for decorative hardware, automotive trim, and consumer electronics components requiring a black metallic appearance.
Technical Specifications
| pH | 1.0-2.0 |
| appearance | Dark brown to black liquid concentrate |
| film appearance | Uniform matte to semi-gloss black |
| active content (%) | ≥28 |
| salt spray resistance (h) | ≥96 |
Applications
- Decorative hardware and door fittings black finishing
- Automotive interior trim and fastener black treatment
- Consumer electronics metal component black passivation
- Military and tactical equipment black zinc coating
- Furniture hardware and architectural metalwork finishing
Key Features
- Uniform black appearance suitable for decorative applications
- Good corrosion resistance with minimum 96-hour salt spray performance
- Compatible with wax and lacquer topcoats for enhanced durability
- Stable bath chemistry with consistent color output