There are several different grades of aluminum that are suitable for marine conditions. These alloys typically have chromium, magnesium and/or silicon, which increase the aluminum’s corrosive resistance. Common marine-grade aluminum alloys are 2052, 5083, and 5086 aluminums as well as 6061-T6.
Stainless steel is inherently resistant to corrosion, so 304 and 316 are great materials for all manner of uses in marine or outdoor environments. Grade 316 is slightly better in this regard, since 316 tends to have more nickel and molybdenum in the alloy. Both resist the corrosive effects of salt water or spray and chlorine.
Applications: Barriers, fence rails/bannisters, marine fittings and fasteners, and marine structures.
Copper is used in many marine-based applications, as well as in the brewing and distilling industries, plumbing, and appliance design and repair. C706 or C715 copper-nickel (or cupro-nickel) are commonly found in heat exchange units, air conditioners, and condensers. This alloy contains nickel and manganese to help resist corrosion.
Applications: Plumbing tubes, heat exchanger tubes, marine fittings and vales, distilling and brewing systems, water lines, and desalination equipment
Admiralty Brass (C433) and Naval Brass (C464) are both exceptional alloys for use in heat exchangers and condensers, as well as in marine motor and pump applications. Both additions of zinc and tin which allow the brass alloy to resist corrosion in wet or even underwater applications.
Applications: Pipes, baffles, fasteners, marine motors and pumps.