In coastal photovoltaic projects, salt spray corrosion is the single greatest threat to long-term structural integrity. High chloride deposition, humidity, and wind-driven salt particles create aggressive marine atmospheres (ISO 12944 C4–C5). Conventional hot-dip galvanized steel often develops rapid red rust at cut edges and fastener points, leading to costly maintenance or premature replacement well before the 25-year design life of a solar plant.
55% Al-Zn Galvalume (GL / AZ-coated) steel solves this challenge through a dual protection mechanism. The coating-typically 55% aluminum, 43.5% zinc and 1.5% silicon applied by continuous hot-dip-forms a dense aluminum-rich oxide barrier that resists moisture and chloride penetration. At the same time, the zinc-rich phases provide sacrificial protection at scratches, cut edges and minor coating damage. Laboratory salt-spray testing (ASTM B117) shows AZ150 Galvalume routinely lasting 1,500–2,000 hours or more before significant red rust appears-noticeably longer than standard galvanized coatings of comparable thickness.
Technical Parameters Comparison
| Parameter | Specification |
|---|---|
| Substrate | Cold-rolled / Hot-rolled steel |
| Coating Type | 55% Al – 43.5% Zn – 1.5% Si (Galvalume / AZ) |
| Coating Weight | AZ100 / AZ150 / AZ185 / AZ200 (g/m²) |
| Thickness | 0.3 – 2.0 mm (customizable) |
| Width | 600 – 1250 mm (customizable) |
| Salt Spray Resistance | ≥1,500–2,000 hours (ASTM B117, AZ150) |
| Corrosion Category | Suitable for ISO 12944 C4–C5 (with proper detailing) |
| Surface Finish | Regular spangle / Minimized spangle / Skin-passed |
| Optional Topcoat | PVDF / PVF / PE (for enhanced coastal protection) |
| Standards | ASTM A792, EN 10346, JIS G 3321, GB/T 14978 |
Real-world coastal projects confirm the durability advantages. Galvalume mounting structures, purlins and brackets deliver excellent strength-to-weight ratio, superior formability and competitive cost compared with aluminum alloys. When correctly specified-higher coating mass, edge treatment and distance-based warranties-they reliably support 25+ year service life targets with significantly reduced maintenance intervals. Many developers already deploy Galvalume systems in C4–C5 environments, reserving Zn-Al-Mg grades only for the most extreme splash zones.
Successful project landing requires precise adaptation: accurate site corrosivity classification, selection of appropriate coating weight and optional topcoat, careful detailing of cut edges and fasteners, and alignment with manufacturer warranties linked to coastal distance. Regular inspection protocols combined with local climate data further optimize long-term performance.
Choose 55% Al-Zn Galvalume steel for your next coastal PV project. Contact us today for full technical data sheets, salt-spray test reports and project-specific coating recommendations that turn salt-spray risk into lasting asset reliability.For a fast quotation, please request a quote.
Packaging & Delivery
Standard Packaging: Waterproof paper + plastic film + steel strapping + wooden pallet / steel frame
Lead Time: 7–15 days after deposit (depending on order quantity)
Port of Loading: Qingdao Port, China
MOQ: 5–10 tons (negotiable for trial orders)
Quality Certifications
ISO 9001 Quality Management System
SGS / BV Third-party Test Reports
Compliance with ASTM, EN, JIS and GB standards
RoHS & REACH environmental compliance
Company Support
Customized production according to project drawings and corrosivity requirements
Professional technical consultation for coastal PV applications
Stable annual supply capacity of 200,000 tons
Flexible payment terms (T/T, L/C, etc.)
Full technical data sheets and salt-spray test reports available
FAQ
Q: Why is Galvalume better than conventional galvanized steel for coastal PV projects?
A: Galvalume's aluminum-rich barrier provides superior resistance to chloride penetration, while zinc still offers sacrificial protection at cut edges. It typically lasts significantly longer in C4–C5 environments.
Q: What coating weight do you recommend for coastal sites?
A: AZ150 is commonly used. For more aggressive marine exposure or closer distance to the sea, we recommend AZ185 or AZ200, sometimes with an additional PVDF topcoat.
Q: Can you supply higher thickness material for structural posts?
A: Yes. We can supply up to 2.0–3.0 mm thickness depending on the specific requirements of the mounting system.
Q: Do you provide test reports?
A: Yes. We can provide salt-spray test reports, coating weight certificates and third-party inspection reports upon request.
Q: What is the typical service life in coastal environments?
A: When correctly specified (coating weight + edge treatment + fasteners), Galvalume systems routinely achieve 25+ year design life targets with proper maintenance protocols.
Contact Us / Call to Action
Choose PINJIE 55% Al-Zn Galvalume steel for your next coastal PV project. Contact us today for full technical data sheets, salt-spray test reports and project-specific coating recommendations.
[Request a Quote] | [Download Specification Sheet] | WhatsApp / Email: kelly@ppgi-steel.com
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