It's a great question! Seeing rusty bolts on a public bench definitely undermines that sense of quality and care. Here’s how we, and most reputable manufacturers and city maintenance teams, tackle corrosion to ensure benches last for years.
The first and most crucial line of defense is material selection. For critical fasteners like bolts, nuts, and washers, we specify stainless steel (typically Grade 304 or 316). The chromium in stainless steel forms an invisible, self-repairing oxide layer that shields the metal from moisture and oxygen. For structural frames, hot-dip galvanized steel is the standard. This process involves dipping the steel into molten zinc, creating a thick, bonded coating that sacrificially protects the underlying metal even if scratched.
Beyond the base metal, we apply advanced powder coatings to bench frames. This dry powder is electrostatically applied and then heat-cured into a durable, uniform skin. It provides an exceptional barrier against moisture, UV rays, and salts. For added protection in harsh coastal or high-humidity areas, we use zinc-rich primer beneath the topcoat, offering dual-layer cathodic protection.
Smart design is also key. We design benches to minimize water and debris traps. Smooth contours, proper drainage holes, and placing fastener heads in sheltered positions prevent the constant wetness that accelerates rust.
Finally, it's about proactive maintenance. Regular inspections by city crews are vital. They look for chips in the coating, loose fittings, or early signs of corrosion. Any issues are addressed immediately—tightening loose bolts, touching up coatings, or replacing a single fastener before problems spread. This cycle of quality materials, intelligent design, and routine care is what keeps urban benches safe, sturdy, and aesthetically pleasing season after season.