Aluminum is corrosion resistant and light weight.
It has a lower structural stiffness than steel (about 1/3), which must be compensated for by thicker gauge.
Powdercoat, No Finish or Grained Finish
Typically, stainless steel fasteners are used with aluminum. However, in some cases, zinc-plated fasteners are used, depending on the application.
Stocked Aluminum alloy (Sheet Metal)
5052 Aluminum - H32
5052 Aluminum is optimal for sheet metal work and is very easy to form at room temperature. This material is very bendable, and can therefore handle tight radii. A non-heat treatable alloy, 5052 aluminum is readily welded by conventional methods. It has good forming characteristics and good corrosion resistance, including resistance to salt water. 5052 aluminum is also relatively easy to machine.
6061 Aluminum - T6
Aluminum is a general-purpose alloy commonly used in extrusions, and is also available in sheet metal. However, it is not recommended for sheet metal work because it tends to crack on the outside radii once it passes its yield (and therefore requires a much larger radii to be able to bend properly). 6061 aluminum is also very easy to machine.
Note: Gauges are typically not used when specifying aluminum as the actual thickness of the aluminum is more internationally recognized. It starts at sheet by thickness and migrates into plate at the thicker end of the scale.