Thank you for your question about our metal outdoor bench’s performance in salty coastal air. This is a critical concern for anyone living or operating near the ocean, where salt-laden moisture accelerates corrosion. I’ll break down exactly how we engineer our metal benches to withstand these harsh conditions.

First, the grade of metal matters. Our standard bench is made from marine-grade aluminum alloy (typically 6061-T6 or 5083-H116), which naturally forms a protective oxide layer that resists pitting and crevice corrosion in salt spray. Unlike mild steel or untreated iron, this alloy does not rust red or flake. We also offer a powder-coated finish—a multi-layer coating baked on at high temperature—that acts as an additional barrier. The coating is UV-stable and tested for 1,000+ hours in ASTM B117 salt fog chambers, simulating years of coastal exposure.

For customers who prefer steel, we use hot-dip galvanized steel with a zinc coating thickness of at least 85 microns, followed by a marine-grade polyester powder topcoat. This dual-layer system prevents the steel from corroding even when the coating is scratched. In our factory, we perform a scribe test: we cut a cross into the coating, then expose the panel to continuous salt spray for 500 hours. The corrosion creep from the scribe line typically stays under 2 mm, far exceeding industry standards.

All fasteners—bolts, screws, rivets—are 316 stainless steel, which contains molybdenum for extra resistance in chloride environments. We also use nylon or aluminum spacers where possible to avoid galvanic corrosion between dissimilar metals. Our welding rods match the base metal’s corrosion resistance.

Finally, we design for drainage. Bench slats have slight gaps and angled supports to prevent water pooling, and all hollow sections are sealed. If moisture cannot collect, rust cannot start.

In short: our metal bench is built to last in coastal air. We provide a 15-year warranty against rust perforation for the marine-grade aluminum version, and 10 years for the galvanized steel option. I invite you to visit our test lab or request a sample panel exposed to your local coastal environment. We stand by our engineering.