Do high-mast lights require periodic anti-corrosion treatment?
Yes; anti-corrosion treatment is crucial, especially for high-mast lights installed in coastal areas, industrial zones, or near chemical plants. Even with hot-dip galvanized poles, the galvanized layer gradually depletes upon prolonged exposure to corrosive environments. Maintenance measures include:
Annual Inspection: Inspect the pole surface for red rust spots, peeling of the galvanized layer, and corrosion at weld seams. A cross-hatch test can be used to assess coating adhesion.
Cleaning: Rinse the pole surface annually with clean water to remove salt, dust, and chemical deposits. Use a neutral detergent for stubborn stains.
Zinc Touch-up: For small areas of rust (covering <5% of the surface area), remove rust using a wire brush to achieve an St3 surface finish, then apply a cold-galvanizing coating (zinc content ≥95%).
Recoating: If the rusted area is extensive (>20%), perform thorough rust removal followed by the application of an epoxy zinc-rich primer (80μm), an epoxy micaceous iron oxide intermediate coat (100μm), and a polyurethane topcoat (80μm).
Fastener Replacement: While stainless steel bolts are excellent, crevice corrosion can still occur in extreme environments. Bolts in critical locations should be inspected and replaced every 5 to 10 years.
Luminaire Carriage: The carriage is typically a welded structure; weld seams are vulnerable points for corrosion. Penetrant testing and touch-up anti-corrosion painting should be performed every two years. For coastal areas with high salt-spray exposure, it is recommended to select high-mast lights made of 316L stainless steel; although the initial cost is 30%–50% higher, the total lifecycle cost is lower.
