I. Core Process Principle

Adopting 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

Indicator Parameter Value/Characteristic Testing Standard

Zinc coating thickness ≥65μm (average) / ≥55μm (local) GB/T 13912

Salt spray resistance ≥1000 hours without red rust, per ASTM B117

Adhesion, Impact Deformation with No Flaking – 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):

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• Light-duty (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-Fog Zone: Sacrificial Anode Protection (Self-Healing at Damage Points)

Underground Utility Tunnel: Moisture- and Mold-Proof (100% Humidity Tolerant)

High-temperature workshop, continuously withstands temperatures up to ≤200°C (zinc coating remains intact without chalking).

5. Comparison with Electro-Galvanized Cable Trays

Features: Hot-Dip Galvanized Cable Trays vs. Electro-Galvanized Cable Trays (Comparison)

Zinc coating thickness: 65–300 μm, 5–20 μm

Corrosion resistance lifespan: 25 years, 3–8 years

Processing methods: 1. Form first, then galvanize (fully coated) 2. Base material pre-galvanized (cut surfaces remain exposed)

Cost-effective: Low lifecycle costs and low initial investment.

6. Key Technical Considerations for Selection

Zinc Flower Control:

Regular zinc flowers: Crystalline patterns (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.