Al-Zn-Mg-Cu alloy with high surface treatment effect as well as preparation method and application of Al-Zn-Mg-Cu alloy

The invention discloses an Al-Zn-Mg-(Cu) alloy with a high surface treatment effect as well as a preparation method and application of the Al-Zn-Mg-(Cu) alloy. The alloy comprises the following components in percentage by mass: 7.00%-8.50% of Zn, 1.80%-3.50% of Mg, 0.20%-0.50% of Cu, 0.03%-0.15% of Mn, 0.005%-0.015% of Ti, less than or equal to 0.001% of Cr, less than or equal to 0.08% of Fe, less than or equal to 0.08% of Si and the balance of Al and inevitable impurities. The Al-Zn-Mg-Cu alloy has high tensile strength and high yield strength, also has good corrosion resistance and good surface treatment effect, solves the problems that the Al-Zn-Mg-Cu alloy is low in surface glossiness and rough and uneven in surface after anodic oxidation, and is suitable for popularization and application in large-scale industrialization. 本发明公开了一种高表面处理效果的Al-Zn-Mg-(Cu)合金及其制备方法与应用，所述合金包含以下质量百分比的组分：Zn：7.00％-8.50％，Mg：1.80％-3.50％，Cu：0.20％-0.50％，Mn：0.03％-0.15％，Ti：0.005％-0.015％，Cr≤0.001％，Fe≤0.08％，Si≤0.08％，其余为Al和不可避免的杂质。本发明的Al-Z