High-strength corrosion-resistant Al-Zn-Mg aluminum alloy and preparation method thereof

The invention provides a high-strength corrosion-resistant Al-Zn-Mg aluminum alloy. The high-strength corrosion-resistant Al-Zn-Mg aluminum alloy comprises the following components in percentage by mass: 4.10 < = Zn/Mg < = 5.40; 12wt% < = 4Mg + Zn < = 14.5 wt%; less than or equal to 0.20 wt% of Fe; less than or equal to 0.10 wt% of Si; cu is less than or equal to 0.30 wt%; mn is less than or equal to 0.10 wt%; less than or equal to 0.10 wt% of Cr; 0.10 wt% or less of Ti; 0.10 wt% to 0.25 wt% of Zr; the balance is inevitable impurity elements and Al; the single content of the impurity elements is less than or equal to 0.05 wt%, and the total content is less than or equal to The aluminum alloy has excellent yield strength and corrosion resistance. 本发明提供的高强耐蚀Al-Zn-Mg铝合金，包括以下质量百分比成分：4.10≤Zn/Mg≤5.40；12wt％≤4Mg+Zn≤14.5wt％；Fe≤0.20wt％；Si≤0.10wt％；Cu≤0.30wt％；Mn≤0.10wt％；Cr≤0.10wt％；Ti≤0.10wt％；Zr：0.10～0.25wt％；其余为不可避免的杂质元素和Al；所述杂质元素单个含量≤0.05wt％，合计≤0.15wt％。该铝合金具有优异的屈服强度及耐腐蚀性能。