Heavy-Duty Anti-Corrosion Coating System for Hangzhou Bay Cross-Sea Bridge Concrete Piers
Advanced marine-grade coating solutions for Hangzhou Bay Cross-Sea Bridge concrete piers. ISO-certified corrosion-resistant systems against saltwater, humidity & chemical erosion. Extend infrastructure lifespan with our epoxy-polyurethane hybrid coatings.
Project Overview
The concrete piers of the Hangzhou Bay Cross-Sea Bridge are exposed to severe marine corrosion (salt spray concentration >1,500mg/m².d, tidal zone wet-dry cycles ≥2/day).
Pre-application inspections revealed critical issues:
✔ Chloride penetration depth: 20mm
✔ Concrete spalling in splash zones
✔ Steel reinforcement corrosion rate exceeding design limits by 300%. In 2024, our C5-M marine-grade heavy-duty anti-corrosion system was deployed to achieve 30-year maintenance-free protection.
Technical Challenges
1: Complex corrosion factors: Seawater pH8.1-8.4, sulfate content exceeding Class III limits per GB/T 50476-2019.
2: Harsh construction constraints: 3-4 hour daily tidal work windows, substrate moisture content <6%.
3: Durability requirements:
✔ Chloride diffusion coefficient <1×10⁻¹²m²/s
✔ Freeze-thaw resistance (300 cycles)
✔ Impact resistance (5kJ/m²energy absorption).
Coating System Design
Layer | Material & Specifications | Key Function |
Penetration Sealer | Solvent-free epoxy Primer (≥8mm penetration) | Chloride migration barrier |
Anti-Corrosion Layer | Glass flake epoxy coating (500μm DFT) | Mechanical/chemical resistance |
Weathering Topcoat | Aliphatic Topcoat (ASTM G154 3,000h UV resistance) | Biofouling/UV protection |
