Global photovoltaic installed capacity keeps growing year by year with diversified application scenarios, including inland mountain PV, industrial rooftop PV, coastal tidal flat PV and offshore floating PV. Great differences exist in corrosion, temperature difference and wind pressure among various environments. Ordinary galvanized fasteners can no longer support the 25-year long service life of power stations, creating huge market opportunities for high-performance anti-corrosion solar fasteners.
Inland mountain PV features dry air and low chloride content, where conventional hot-dip galvanized fasteners work for a short period. Coastal and offshore areas suffer from heavy salt in sea wind and long-term high humidity that accelerates metal rust. Industrial plants with acid and alkali waste gas also erode bracket connections.
Rust, thread jamming and strength degradation of fasteners easily lead to loose and displaced brackets, bringing safety risks to PV modules and raising later maintenance replacement costs. EPC contractors are upgrading fastener procurement standards comprehensively.
1. 304 stainless steel: Suitable for common inland PV projects, better anti-rust performance than galvanized carbon steel with high cost performance, widely used in residential rooftop PV. 2. 316 stainless steel: With molybdenum element, outstanding salt fog and pitting resistance, the top choice for coastal and offshore PV with long maintenance-free service life. 3. Carbon steel with Dacromet coating: High substrate strength and excellent salt fog resistance, popular for large ground PV to balance cost and anti-corrosion performance. 4. Hot-dip galvanized carbon steel: Only for short-term dry inland projects, eliminated by large-scale projects due to short service life in corrosive environments.
Updated domestic standards for PV bracket components set minimum neutral salt fog test hours for coastal and offshore fasteners. Tender projects in Europe, America and Southeast Asia require manufacturers to provide material certificates, salt fog test records, mechanical strength reports, ISO and RoHS certifications. Products without complete test documents will be excluded from procurement lists.
Single anti-rust materials fail to meet current construction demands. Integrated PV screws with flange surface, EPDM waterproof gaskets and anti-loose teeth are becoming mainstream. One fitting realizes fastening, waterproofing, anti-loose and anti-rust functions simultaneously, simplifying construction procedures, reducing accessory types and improving overall installation efficiency.
New energy support policies launched worldwide drive concentrated construction of coastal and island PV projects, pushing up overseas demand for long-term anti-corrosion hardware. PV fastener manufacturers with stable production capacity, complete quality inspection systems and customized size services enjoy rapid growth in export orders, making weather-resistant anti-corrosion fittings core competitive products.