Photovoltaic fasteners are exposed to sunlight, rain and temperature variation all year round. Coastal power stations suffer salt fog erosion. Anti‑corrosion performance determines long‑term safety of PV bracket systems, and salt spray test serves as a critical pre‑project inspection item.
Salt‑spray requirement is low for indoor fasteners. Fasteners for rooftop distributed and inland ground‑mount PV projects usually pass 48‑200 hours NSS test. For coastal and tidal‑flat power plants, stainless‑steel or Dacromet coated parts shall reach more than 500‑hour salt‑spray resistance.
Material alone cannot guarantee performance. Machining defects and surface contaminants may still cause pitting corrosion. Buyers should request third‑party salt‑spray reports during procurement to avoid later‑stage maintenance risks caused by poor‑quality components.
As domestic and overseas PV projects expand toward coastal and island zones, demand for high‑weather‑resistance fasteners will keep growing, driving continuous improvement of industry technical specifications.