There are four types of metals considered to be corrosion-resistant metals: stainless steel, brass, copper and aluminum. All are effective at preventing corrosion, but they’re more suited to light- or non-structural use because of cost and/or limited strength. Galvanized steel is somewhat corrosion resistant as it slows rust, but it won’t stop rust and will eventually weaken. The most effective choice is a high-strength non-metal material, such as Bedford fiberglass-reinforced plastic.