HUIYI G90 Galvanized Steel: 275g/m² Zinc Fights Coastal Corrosion
August 5, 2025
HUIYI's ASTM G90 Galvanized Steel Coil 275g/m² Zinc Coating Delivering Extreme Corrosion Resistance deploys a 275g/m² zinc coating (38.5μm) engineered through precision hot-dip galvanization. This creates a metallurgically bonded zinc-iron alloy layer (ZF) that withstands 1,000+ hours of ASTM B117 salt spray testing - exceeding ISO 9227 C5-M requirements for marine environments. Certified to ASTM A653 and EN 10142, the coating's sacrificial protection mechanism actively repairs micro-scratches, ensuring continuous defense against chloride penetration.
The coil's corrosion resistance stems from three patented factors:
- Electrochemical Priority: Zinc sacrificially corrodes before steel, with corrosion rate <1μm/year in pH 5-12 environments.
- Self-Passivating Layer: Zinc carbonate (Zn₅(CO₃)₂(OH)₆) formation blocks oxygen diffusion (O₂ permeability: 0.05 cc/m²/day).
- Alloy Barrier: Zeta-phase crystals (FeZn₁₃) at steel-zinc interface resist abrasion (HV 250 hardness).
Backed by a 25-year anti-perforation warranty, every coil includes:
- Batch Traceability: Laser-etched coil IDs linked to mill test reports.
- Climate-Adaptive Packaging: VCI kraft paper with humidity-controlled resin activation.
- Global Rapid Response: 15-day delivery for emergency infrastructure repairs.