Solar PV fasteners work outdoors all year round. Anti-corrosion treatment is vital to extend service life. Different coatings and materials have distinct performance in salt spray resistance, durability and cost.
| Treatment | Salt Spray Life | Outdoor Lifespan | Application | Cost |
| Hot-Dip Galvanized | 480-600h | 8-12 years | Inland dry areas | Low |
| 304 Stainless Steel | 500-800h | 15-20 years | Inland & mild humidity | Medium |
| Dacromet | Over 1200h | 20-25 years | Coastal & industrial areas | Medium-High |
| 316 Stainless Steel | 1000-2000h | 25+ years | Offshore & heavy salt spray | High |
Hot-dip galvanized is cost-effective for inland projects. 304 stainless steel is easy to maintain. Dacromet stands out in corrosive environments. 316 stainless steel offers the best protection for offshore and coastal PV stations with long-term lifespan demands.