Aluminum sheet for marine purpose have many excellent properties and are superior materials for the manufacture of marine structures and ships for their corrosion resistance. Many advantages of marine aluminum sheet, such as light weight, high strength, high corrosion resistance, low maintenance cost and recyclability, greatly meet the needs of marine engineering equipment development. Marine aluminum sheet alloy is not only a good material for manufacturing shore, shore-based facilities, and the upper and interior of ships, but also a material for manufacturing the underwater part of ships, that is, the hull. As early as the 1930s, aluminum alloys were used to manufacture hulls.

The oxide film is of decisive significance to the corrosion resistance of aluminum sheet for marine purpose, all factors that can improve the density of the oxide film, increase the thickness of the oxide film, and improve the insulation performance of the oxide film will help improve the corrosion resistance. Compared to boats constructed from steel and other materials, aluminum ship is 15-20% lighter.

The corrosion resistance of marine aluminum sheet in seawater is arranged in descending order as follows: aluminum-magnesium alloys (5xxx series), aluminum (1xxx series), aluminum-manganese alloys (3xxx series), aluminum-magnesium-silicon alloys (6xxx series) ), aluminum-zinc-magnesium alloys (7xxx series), aluminum-silicon alloys (4xxx series), aluminum-zinc-copper-magnesium alloys (7xxx series), aluminum-copper-magnesium alloys (2xxx series), and aluminum-copper alloys (2xxx series). Therefore, when selecting marine aluminum sheet materials, 5xxx series aluminum alloys should be the first choice. At the same time, the magnesium content of the alloy should be ≤5%, so as to have good formability. 5052, 5083, 5086, 5454 aluminum alloys can be regarded as the representative products of 5000 series aluminum sheet for marine purpose, and the states are O, H111, H112, H116, H321, etc.