Marine Grade Aluminum 5086 and 1561
5059 and 1561 aluminum plates are the highest-end marine aluminum alloys and are currently recognized as the most technically difficult high-end marine aluminum alloys in the industry. 1561 aluminum plate is an aluminum alloy with low density, high specific strength and good elongation.
1561 aluminum alloy is a new type of anti-rust aluminum alloy developed on the basis of the existing Al-Mg series to increase the Mg and Mn content and reduce the content of impurity elements to meet the needs of high corrosion-resistant load-bearing components.
Compared with 5083 aluminum alloy, 1561 aluminum alloy has higher strength. With the trend of high-speed, lightweight and large-scale ship manufacturing, 1561 aluminum alloy will become the preferred material to improve the quality and performance of ships.
After the 1561 aluminum alloy undergoes solution treatment, the precipitated phase and the segregated Mg element at the grain boundary are dissolved back into the aluminum matrix. The alloy's resistance to intergranular corrosion is improved and the susceptibility to stress corrosion cracking is reduced. The dispersed phase Al_6 (Fe, Mn) phase in the alloy, as a cathode phase, can cause corrosion of the nearby aluminum matrix, which is the main form of pitting corrosion in 1561 aluminum alloy.
Marine grade aluminum 5086 is the the recommended hull material for small aluminum boats and large yachts. Its high strength and excellent corrosion resistance make it ideal for yachts. The tensile strength of 5454 aluminum alloy sheet is the same as that of 5086 aluminum alloy. The United States mainly uses 5456 aluminum alloy, but recently used 5086-O aluminum alloy plates and 5086-H111 aluminum alloy extruded profiles on high-speed boats.
5086 aluminum plate belongs to the 5xxx Al-Mg alloy. The magnesium content generally does not exceed 7%. As the magnesium content increases, the strength of the alloy will increase, while the plasticity will decrease. is usually used in the annealed state, cold work hardening or semi cold work hardening state. Due to the role of magnesium, 5086 anti-rust aluminum plates have a much higher density than other aluminum plates and have very good corrosion resistance.
