Marine aluminum alloys can be divided into deformed aluminum alloys and cast aluminum alloys according to different manufacturing processes. Because marine aluminum alloys have special requirements for strength, corrosion resistance, and weldability, aluminum-magnesium alloys are mostly used for marine aluminum alloys.aluminum-magnesium-silicon-based alloys and aluminum-zinc-magnesium-based alloys, among which 5 series aluminum-magnesium alloys are widely used on ships, then, what are the characteristics of 5 series marine aluminum alloys?



There are three main types of 5 series marine aluminum alloys: 5083, 5086, and 5456. The 6 series alloys will undergo intergranular corrosion in seawater, so the ship's superstructure is used more. The 7 series alloys have the disadvantage of poor corrosion resistance, so the use range is limited. Taken together, the 5 series marine aluminum plate is currently a more widely used and more promising aluminum alloy product.

5083 marine aluminum can be regarded as the representative product of 5 series marine aluminum plate. The states are O, H111, H112, H116, H321, etc. The composition of 5083 aluminum plate alloy is: aluminum Al: balance, silicon Si: ≤0.40, copper Cu: ≤0.10 , Magnesium Mg: 4.0 ～ 4.9, zinc Zn: ≤0.25 manganese Mn: 0.40 ～ 1.0 titanium Ti: ≤0.15 chromium Cr: 0.05 ～ 0.25 iron Fe: 0 ～ 0.400, 5083 aluminum alloy has medium strength, good corrosion resistance and formability , High fatigue resistance, generally used as the main structure of the hull. Others such as 5052, 5086, 5454, 5456, etc. are also mostly used in hull structures or pressure vessels, pipelines, hulls and decks.

Generally speaking, the thickness of the plate is determined by the hull structure, ship specifications, and location of use. From the perspective of hull lightweighting, thin plates are generally used as much as possible, but the depth of plate corrosion during use should also be considered. The plate has a thin plate of more than 1.6mm and a thick plate of more than 30mm. There are also some special specifications of plates used in shipyard contracts. For non-slip, the deck is patterned.

With the R & D innovation and the enhancement of production capacity, 5 series marine aluminum plates will usher in greater development opportunities, providing a broad space for development and transformation of aluminum processing.