Excellent Protection
Zinc coating provides superior corrosion resistance.
Galvanizing Quality
Corrosion Protection. Long-lasting Performance.
At ZZ Steel, hot dip galvanizing is performed strictly in accordance with international standards and customer requirements to provide excellent corrosion protection and long service life for our steel structures.
Long Service Life
Designed for 20+ years of service in harsh environments.
Uniform Coating
Uniform and metallurgically bonded coating for all surface.
Strict Control
Complete process control to ensure consistent galvanizing quality.
Tested & Verified
Multiple inspections and tests to guarantee coating performance.
Quality Assured
Comply with international standards and project specifications.
Galvanizing Process
1. Surface Preparation
Degreasing and removal of oil, dirt and contaminants.
2. Pickling
Remove rust and mill scale in acid solution.
3. Rinsing
Thorough rinsing with clean water.
4. Fluxing
Immerse in flux solution to improve coating adhesion.
5. Galvanizing
Hot dip in molten zinc bath (≈450°C).
6. Cooling
Cooling in water or air to form zinc layer.
7. Inspection
Inspection and testing before packing.
Galvanizing Standards
- ISO 1461: Hot dip galvanized coatings on fabricated iron and steel articles.
- ASTM A123 / A123M: Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.
- EN ISO 1461: Hot dip galvanized coatings on fabricated steel articles.
- GB/T 13912: Hot dip galvanized coatings on steel articles.
- Other standards and special requirements are available upon request.
Typical Coating Thickness (Minimum Average)
| Material Thickness (mm) | Coating Thickness (μm) | ||
|---|---|---|---|
| ISO 1461 | ASTM A123 | GB/T 13912 | |
| ≥ 6 | 85 | 85 | 70 |
| 3 – 6 | 70 | 70 | 55 |
| 1.5 – 3 | 55 | 55 | 45 |
| 0.7 – 1.5 | 45 | 45 | 35 |
| < 0.7 | 35 | 35 | 25 |
Coating Characteristics
- Metallurgically bonded zinc-iron alloy layers for strong adhesion.
- Uniform coating on internal and external surfaces.
- Cathodic protection – self-healing of minor scratches.
- Excellent corrosion resistance in various environments.
Quality Inspection & Testing
Coating Thickness Test
Magnetic thickness gauge to measure coating thickness.
Appearance Inspection
Visual inspection for surface finish, uniformity and defects.
Adhesion Test
Bend test to verify coating adhesion (no peeling or flaking).
Mass per Unit Area Test
Weighing method to determine zinc coating mass.
Zinc Purity Analysis
Chemical composition analysis to ensure zinc purity.
Salt Spray Test (Optional)
Salt spray test to verify corrosion resistance performance.
Typical Application Environments
Coastal Areas
Industrial Areas
Desert Areas
Mountain Areas
Cold Regions
Benefits of Hot Dip Galvanizing
- Long-term corrosion protection, reducing maintenance cost.
- Durable performance in severe environments.
- Cost-effective solution with long service life.
- Environmentally friendly and 100% recyclable.
Our Commitment
ZZ Steel is committed to delivering high quality galvanized products.
With strict process control, advanced equipment and professional team, we ensure every product we deliver meets the highest standard and your expectations.
Strict Process
Control
Control
Advanced
Galvanizing Line
Galvanizing Line
Experienced
Team
Team
Complete Quality
Inspection
Inspection
Reliable Quality
Assurance
Assurance
Quality Galvanizing. Durable Protection.
ZZ Steel provides reliable and long-lasting solutions for your power infrastructure.