5383VS 5083 Aluminum Sheet in Shipbuilding
The working environment of ships requires that aluminum alloys not only have good corrosion resistance, but also have certain mechanical strength, fatigue strength, plasticity and impact resistance. Among them, Al-Mg alloys such as 5083, 5383, 5A06, 5A01 and other high-magnesium aluminum alloys are used to make ship parts such as ship plates and ship hulls.
Al 5083 h321 is an aluminum-magnesium alloy. In this alloy: the content of Si is not more than 0.40%; Fe, 0.40%; Cu, 0.10%; Cr, between 0.05-0.25%; Ti, less than 0 15%; Mg, between 4.0-4.9%; Zn, not more than 0.25%; Al is the remainder.
Through special production process, 5083 alloy can be guaranteed to have moderate strength and good corrosion resistance at the same time, especially its resistance to exfoliation corrosion and intergranular corrosion.
5383 aluminum plate is an improved alloy of 5083 aluminum alloy. Compared with 5083 aluminum alloy, 5383 aluminum alloy has higher strength and better welding performance. The Mg content in the 5383 aluminum alloy is between 4.0 and 5.2%. However, it needs stabilization annealing to improve its corrosion resistance.
The reason why the 5383 aluminum alloy sheet prepared by the traditional process is prone to corrosion failure is that the Al3Mg2 phase in the 5383 aluminum alloy is easy to precipitate and distribute continuously along the grain boundary.
If the Al3Mg2 phase in the 5383 aluminum alloy is intermittently distributed, the corrosion failure will not extend to the aluminum alloy matrix, and the corrosion resistance is better than when Al3Mg2 is continuously distributed along the grain boundary.
The stabilization process of the 5383 aluminum plate developed by Haomei Aluminum changes the distribution state of Al3Mg2 by adjusting the amount of cold rolling deformation of the 5383 aluminum alloy sheet and the temperature and time of the heat treatment, so that the Al3Mg2 phase in the 5383 aluminum alloy is intermittently distributed, thus improving its corrosion resistance.
