| 摘要 |
The purpose of the present invention is to provide a 7000-series aluminum alloy extruded material having a desired strength and being unlikely to have a streak pattern formed on the surface of a positive electrode oxide film. The present invention provides: an aluminum alloy extruded material having excellent external appearance quality and having a positive electrode oxide film having a metal composition being a re-crystalized composition; and a production method therefor. The aluminum alloy extruded material contains 4.0%-7.5% by mass Zn, 1.0%-2.2% by mass Mg, 0.05%-0.20% by mass Fe, no more than 0.30% by mass Cu, 0.005%-0.04% by mass Ti, 0.001%-0.02% by mass B, no more than 0.15% by mass Si, no more than 0.05% by mass Zr, no more than 0.05% by mass Mn, no more than 0.05% by mass Cr, and no more than 0.05% by mass V. The total Zr, Mn, Cr, V, and Ti content expressed by [Zr + Mn + Cr + V + Ti] fulfils the relationship [Zr + Mn + Cr + V + Ti] ≤ 0.10% by mass. The remainder comprises aluminum and unavoidable impurities, except when the Zn content is no more than 6.0% by mass and the Mg content is no more than 1.2% by mass. |
