How to Improve Corrosion Resistance of 5052 Marine Grade Aluminium
The common marine grade aluminum alloys are 5083. 5456 and 5052 aluminum plates. 5083 aluminum is often used for marine yachts, 5456 is for inland rivers and 5052 is for park boats. These three alloys have relatively superior mechanical properties, corrosion resistance and welding performance.
5052 marine grade aluminum is one of 5xxx Al-Mg aluminum alloy with a Mg content of 2.2-2.8%. It features light weight, medium strength, good corrosion resistance, good weldability, and easy processing and forming.
The application of aluminum alloy in the shipbuilding industry requires high corrosion resistance against marine atmosphere and seawater corrosion. Although the 5052 aluminum also has a certain degree of corrosion resistance, which cannot fully meet the application requirements of the shipbuilding industry.
Adding trace rare earth elements to aluminum alloy can significantly improve the metallographic structure of 5182 aluminum alloy, refine the grains, remove gases and harmful impurities in the aluminum alloy and reduce the source of cracks in the aluminum alloy, which not only increases the strength of the 5052 aluminum coil, but also It also improves the heat resistance and toughness of aluminum alloys.
Grain refinement can make 5052 aluminum sheet easier to form a passivation film on the surface of the aluminum alloy, which improve the passivation performance of the material, and make the aluminum alloy have higher corrosion resistance.
We also need to effectively control the content of harmful impurities Si and Fe, which can also improve the corrosion resistance of aluminum alloys. Part of Mn dissolves into the aluminum ingot, which can increase the recrystallization temperature, contributing to improving corrosion resistance and reduce welding cracks.
In order to prevent grain coarsening, the content of Mn is controlled within 0.1. The addition of Cr has a strengthening effect on the alloy, but too much content will affect the plasticity, so its content is controlled between 0.18-0.30%. Cu can appropriately improve the corrosion resistance of the alloy, so the Cu content is controlled within 0.20%.
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