Al-Zn-Mg aluminum alloy with high strength and high stress corrosion resistance as well as preparation method and application of Al-Zn-Mg aluminum alloy

The invention discloses an Al-Zn-Mg aluminum alloy with high strength and high stress corrosion resistance as well as a preparation method and application thereof. The Al-Zn-Mg aluminum alloy comprises the following components in percentage by mass: 5.0%-8.0% of Zn, 1.50%-2.50% of Mg, 0.10%-0.60% of Cu, 0.25%-0.60% of Mn, less than or equal to 0.15% of Cr, less than or equal to 0.20% of Zr, less than or equal to 0.10% of Ti, less than or equal to 0.20% of Si, less than or equal to 0.2% of Fe and 85.45%-91.80% of Al. The Al-Zn-Mg aluminum alloy disclosed by the invention not only has relatively high mechanical properties, but also has excellent stress corrosion resistance. 本发明公开了一种高强高抗应力腐蚀性能Al-Zn-Mg铝合金及制备方法与应用。上述Al-Zn-Mg铝合金，按质量百分比计，包括以下组分：Zn：5.0％-8.0％，Mg：1.50％-2.50％，Cu：0.10％-0.60％，Mn：0.25％-0.60％，Cr≤0.15％，Zr≤0.20％，Ti≤0.10％，Si≤0.20％，Fe≤0.2％，Al：85.45％-91.80％。上述Al-Zn-Mg铝合金，既具有较高的力学性能，又具备优异的抗应力腐蚀性能。