Coating anti-corrosion performance varies greatly. Proper coating selection based on site environment balances project cost and 25-year service requirement of photovoltaic power station.
List verified neutral salt spray endurance of four mainstream coatings widely used in solar bracket industry for quick reference.
Hot-dip galvanized for inland dry area, Dacromet for industrial polluted zone, zinc-nickel or 316 stainless steel for coastal high-salt environment.
Reserve thread tolerance for hot-dip galvanized bolts due to thick coating layer; apply zinc-nickel fasteners only on critical load positions to save cost.