I. Core Process Principle

Employing the ASTM A123 standard hot-dip galvanizing process:

Pre-treatment: Alkali degreasing → Hydrochloric acid pickling → Activator-based coating activation
Galvanizing process: Immersion in a zinc molten bath at 450–465°C (duration: 5–10 minutes)
Zinc-iron reaction: Formation of a δ-phase zinc-iron alloy layer (hardness > 240 HV)
Zinc layer structure:
Outer pure zinc layer (corrosion-resistant barrier)
Inner alloy layer (metallurgically bonded, peel-resistant)

II. Core Performance Parameters
Metrics Parameter Value/Characteristic Testing Standard
Zinc coating thickness: ≥65 μm (average) / ≥55 μm (local), per GB/T 13912
Salt Spray Resistance: ≥1000 hours without red rust, per ASTM B117
Adhesion: No peeling upon hammering and deformation. ISO 1460
Service Life: Industrial Zone – 25+ years / Coastal Zone – 15+ years – ISO 9224

3. Structural Design Standards
Base material: Q235B low-carbon steel (tensile strength ≥375 MPa)
Load classification (according to CECS 31 standard):
Markdown
Copy Code
• Lightweight (Q): ≤800 N/m (uniformly distributed load on walkway panels)
• Medium (Z): ≤1600 N/m
• Heavy-duty (C): ≤3200 N/m

Connecting system:
Punching positioning protruding teeth (installation error ≤ ±0.8 mm)
Galvanized Bolt Set (Corrosion-Resistant Match)

4. Advantages of Scenario-Based Applications
Environmental Type | Solution Highlights
Chemical Corrosion Zone: Zinc Coating Resistant to H₂S/SO₂ Gas Corrosion
Coastal High-Salt-Mist Zone: Sacrificial Anode Protection (Self-Healing for Damage Points)
Underground Utility Tunnel: Moisture- and Mold-Proof (100% Humidity Tolerance)
High-temperature workshop – Continuous temperature resistance ≤200°C (zinc coating remains intact without chalking)

5. Comparison with Electro-Galvanized Cable Trays
Features: Hot-Dip Galvanized Cable Trays vs. Electrically Galvanized Cable Trays (Comparison)
Zinc coating thickness: 65–300 μm / 5–20 μm
Corrosion resistance life: 25 years, 3–8 years
Processing methods: 1. Form first, then galvanize (fully coated) 2. Base material pre-galvanized (cut surfaces remain exposed)
Cost-effectiveness: Low life-cycle costs, low initial cost

6. Key Technical Considerations for Selection
Zinc Flower Control:
Regular zinc flower: Crystalline pattern (average aesthetic appeal)
Zinc-free: Contains aluminum/antimony elements (smooth surface, suitable for cleanroom environments)
Weld seam treatment:
The weld areas require secondary zinc coating (≥55 μm) or application of epoxy-rich zinc primer.
Specially Enhanced:
Coastal Engineering: Requires a zinc coating ≥80μm + sealed topcoat

Certification System: Certified to ISO 1461, UL 1565, and GB/T 3091, meeting the stringent entry standards of CNPC/State Grid Corporation of China and other leading organizations.