Four selection principles for marine aluminum alloys

[China Aluminum Industry Net] Marine aluminum alloy is one of the emerging fields of aluminum alloy products, and it is also the focus of transformation and upgrading of many domestic aluminum processing companies. Marine aluminum alloys are used in marine ships and other fields, so they have more stringent process requirements and performance standards than other common aluminum alloy products. The principle of material selection for marine aluminum can be divided into four aspects. First, there is a high specific strength and specific modulus. The structural strength and size of a ship are closely related to the yield strength and elastic modulus of the material. Since the elastic modulus and density of aluminum alloy are approximately the same, the addition of alloying elements also has little effect. Therefore, increasing the yield strength within a certain range is effective in reducing the structure of the ship. High-strength aluminum alloys are often difficult to have both good corrosion resistance and weldability. Therefore, marine aluminum alloys are generally medium-strength, corrosion-resistant weldable alloys. The second is excellent welding performance. At present, the main use of the ship is the automatic argon arc welding method. Good weldability means that the aluminum alloy has a smaller tendency to form cracks during welding, that is, the aluminum alloy must have good welding crack resistance. The lost weldability cannot be restored by reheat treatment under shipbuilding conditions. The third is excellent corrosion resistance, and the use of ship structures in harsh marine media and marine environments. Corrosion resistance is therefore one of the main signs of marine alloys. Fourth, aluminum alloys have good cold and hot forming properties, because shipbuilding must undergo cold processing and thermal processing. Therefore, marine aluminum alloys must be easily processed and formed without crack defects, and they can still meet strength and strength after processing. Corrosion resistance requirements. Marine aluminum alloy material selection is more rigorous. At present, more aluminum alloy products such as 5083, 5086, 5454, 5754, 6061 are used. In practical applications, the advantages of marine aluminum alloys are very obvious. The first is the small proportion, which can reduce the weight of the ship, save energy, and increase the load. Secondly, it has good corrosion resistance, reduces the cost of oil painting and extends the service life. The third is the welding and processing of the forming number, which is conducive to later processing; Aluminum scrap is easy to recycle and can be recycled. At the same time, it does not burn and it is safe in fire.