W-beam guardrails are exposed outdoors all year round. Rainwater, salt spray and UV rays will accelerate steel corrosion. Anti-corrosion treatment directly affects service life and total project cost. Hot-dip galvanizing and galvanizing plus powder coating are the two most popular processes for export orders.
Hot-dip galvanizing immerses steel parts in molten zinc to form a metallurgically bonded zinc layer. It features strong adhesion and scratch resistance. Suitable for mountainous and coastal areas with heavy salt spray, its maintenance-free life can exceed 20 years, which is the mainstream solution for international highway projects.
Galvanizing plus powder coating adds a polyester powder layer on galvanized steel. It offers both corrosion resistance and decorative appearance with optional colors. It is widely used in scenic roads and park fencing. Note that scratches on the coating will reduce local protection performance, so it is recommended for low-impact locations.
Selection tips for overseas buyers: hot-dip galvanizing for coastal regions; galvanized powder coated guardrails for municipal landscape projects. We can supply zinc thickness test certificates to meet different national engineering standards.
