Process Overview
Zinc Plating
Zinc plating is the most widely used method of corrosion protection for ferrous metals. It acts as a sacrificial coating — the zinc corrodes preferentially, protecting the steel substrate beneath. Available in clear, yellow, black, and olive-drab passivations to suit different aesthetics and corrosion requirements.
Coating Thickness
5–12 µm (standard) | 12–25 µm (heavy)
Typical Turnaround
2–4 business days (standard)
Available Types
Types of Zinc Plating
Clear Zinc (Blue-White)
Bright, silvery appearance with a thin chromate passivation. Provides moderate corrosion protection, suitable for interior hardware and general-purpose fasteners.
Yellow Zinc
Iridescent yellow-gold appearance with thicker hexavalent or trivalent chromate. Superior corrosion protection (72–96 hours salt spray). Common for automotive and industrial fasteners.
Black Zinc
Matte black appearance achieved with black passivation over zinc. Combines aesthetic appeal with good corrosion resistance. Used in automotive interior parts and consumer electronics.
Why It Works
Key Advantages
- Sacrificial cathodic protection of steel
- Excellent cost-to-performance ratio
- Wide range of passivation colours
- Good adhesion for paints and powder coatings
- RoHS-compliant trivalent options available
- Suitable for complex shapes and threaded fasteners
Where It's Used
Applications
- →Automotive fasteners and brackets
- →Construction hardware
- →Electrical enclosures
- →Agricultural equipment parts
- →General industrial components
- →Sheet metal stampings
How We Do It
Our Process
Alkaline or acid cleaning
Acid pickling to remove scale/rust
Zinc electrodeposition (alkaline or acid bath)
Chromate passivation (clear, yellow, or black)
Sealer application (optional)
Inspection