Creating metal sculptures that withstand saltwater corrosion requires careful material selection and specialized techniques. The best approach involves using corrosion-resistant metals like stainless steel (grade 316L is ideal for marine environments), bronze, or aluminum alloys. These materials naturally resist oxidation and pitting caused by saltwater exposure.

For additional protection, apply marine-grade protective coatings such as epoxy primers or powder coatings specifically formulated for underwater use. Electroplating with zinc (galvanization) or nickel can also significantly extend your sculpture's lifespan in coastal areas.

Proper fabrication techniques are equally important. Use TIG welding for stainless steel to maintain its corrosion resistance, and avoid creating crevices where salt can accumulate. Regular maintenance, including freshwater rinsing and wax applications, will further protect your artwork.

Consider designing sculptures with smooth surfaces and minimal joints to reduce areas vulnerable to corrosion. Many marine artists incorporate the natural patina process into their designs, allowing controlled oxidation to become part of the artwork's aesthetic while maintaining structural integrity.

For permanent underwater installations, consult with marine engineers about cathodic protection systems, which use sacrificial anodes to divert corrosion away from your sculpture. With these methods, your metal artworks can endure harsh saltwater environments for decades while maintaining their artistic integrity.