High-strength corrosion-resistant aluminum alloy and preparation method thereof

Abstract

The invention belongs to the field of aluminum alloy materials and discloses a high-strength corrosion-resistant aluminum alloy. The high-strength corrosion-resistant aluminum alloy comprises the following components: 1.3-1.8% of Mg, 1.5-2.0% of Si, 0.7-0.9% of Mn, 0.1-0.4% of Cu, 0.3-0.8% of Zn, 0.1-0.3% of Fe, 0.08-0.2% of Cr, 0.1-0.3% of other alloying elements and the balance Al; the other alloying elements comprise Ni, V, Ti, Zr, and a combination of rare earth elements, with a ratio being (0.2-0.4): (1.6-1.8): (0.4-0.6): (1.4-1.6): 0.2; the ratio of Zn to Fe is 3:1; and the rare earth elements comprises Gd, La, Eu, with Gd accounting for 60% or more of the total amount of the rare earth elements. The aluminum alloy of the invention improves the strength and mechanical properties by improving the material formula, and is mainly used for manufacturing some aluminum alloy parts which require corrosion resistance and certain high strength.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and in particular relates to a high-strength corrosion-resistant aluminum alloy and a preparation method thereof. Background technique [0002] The 6xxx series aluminum alloys are the most widely used and the largest output aluminum alloys. The existing 6xxx series aluminum alloys have been used in important industries such as aerospace, weaponry, transportation, and electric power. However, with the expansion of the application range, the strength, toughness, weldability and corrosion resistance of 6xxx series aluminum alloys have been severely challenged. [0003] The 6xxx series is an Al-Mg-Si alloy, which is an aluminum alloy that can be precipitated and strengthened, and the main strengthening phase is Mg 2 Si, however, currently the content of alloying elements in 6xxx series aluminum alloys is low, for example, the content of Mg is 0.3%-1.2%; the content of Si is 0.3%-1.7%, therefo...

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Problems solved by technology

However, with the expansion of the application range, the strength, toughness, weldability and corrosion resistance of 6xxx series aluminum alloys have been severely challenged.

[0003] The 6xxx series is an Al-Mg-Si alloy, which is an aluminum alloy that can be precipitated and strengthened, and the main strengthening phase is Mg 2 Si, however, the content of alloying elements in 6xxx series aluminum alloys is low at present, such as the content of Mg is 0.3%-1.2%; the content of Si is 0.3%-1.7%, therefore, the alloy strength and hardness are low

Although zirconium, vanadium, boron, titanium and other elements can be added to modify the aluminum alloy, but after the strength of the aluminum alloy is increased, the toughness, corrosion resistance and welding performance will be reduced

[0004] Chinese patent application document CN110066932A discloses a medium-strength corrosion-resistant 6xxx series aluminum alloy and its preparation method. This invention is to solve the problem that the strength and hardness of the existing 6xxx series aluminum alloy alloys are low, which will be reduced when modified with other elements. Toughness, corrosion resistance and weldability issues

Although the aluminum alloy of this invention has good corrosion resistance and welding performance, its strength is still not enough in some special fields, so a high-strength corrosion-resistant aluminum alloy is needed

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