When selecting park benches for a coastal area, the relentless salt air is your primary adversary. Traditional materials like standard wood or untreated steel will succumb rapidly to corrosion and decay. For longevity and minimal maintenance, I strongly recommend two champion materials: Marine-Grade Aluminum and Type 316 Stainless Steel.
Marine-grade aluminum, often alloy 5052 or 6061, is a top-tier choice. It naturally forms a protective oxide layer, making it highly resistant to saltwater corrosion. It's incredibly lightweight, strong, and requires almost no upkeep beyond occasional rinsing. Look for powder-coated finishes for added color and protection.
For maximum durability, specify Type 316 Stainless Steel, often called "marine-grade stainless." It contains molybdenum, which provides superior resistance to chloride corrosion from salt. While more expensive, its strength and iconic, low-maintenance appearance are unmatched for permanent installations.
Avoid these common pitfalls: Standard galvanized steel will eventually rust. Untreated wood will rot and splinter. Regular plastic can become brittle from UV exposure. If you desire a wooden aesthetic, consider sustainably sourced tropical hardwoods like Ipe or thermally modified wood, though these require specialized installation and sealing.
Ultimately, investing in marine-grade aluminum or 316 stainless steel benches ensures your seaside park furniture remains safe, beautiful, and functional for decades, defying the harsh coastal elements with ease.