The difference between aluminum and marine-grade aluminum is how it is alloyed. Aluminum has its own innate properties that make it resistant to corrosion. However, if the intentional use of the material will be in constant contact with moisture, then a marine-grade series aluminum is best.We use a 5052 marine-grade aluminum alloy, which has the following attributes:High resistance to corrosion when in constant contact with moistureLightweightHigh-strengthWeldability