Different contents of Sc and Zr were alloyed into Al-Zn-Mg alloys: Alloy A (0 pct Sc + 0 pct Zr), Alloy B (0.19 pct Sc + 0.09 pct Zr), and Alloy C (0.19 pct Sc + 0.18 pct Zr). The combined alloying of Sc and Zr promoted the primary phase of Al-Zn-Mg alloys to dissolve into the matrix during cold rolling, and produced Al₃(Sc,Zr) precipitates by subsequent aging. The combined alloying of Sc and Zr restrained the recrystallization of Al-Zn-Mg alloys, and caused finer and more uniform grains by the two-stage solution. The distribution of texture was important to understand the microstructural evolution of alloys. The combined alloying of Sc and Zr with the two-stage solution promoted the increase of the cubic texture {001} <100>. The microstructural evolutions including the Al₃(Sc,Zr) precipitates, the precipitation free zone (PFZ) width, the textures and the recrystallizations were the main factors affecting the corrosion resistance of the Al-Zn-Mg alloys containing Sc and Zr. Alloy C after the two-stage solution treatment followed by the two-stage aging had the best stress corrosion cracking (SCC) resistance and the highest electrochemical corrosion resistant properties.

不同含量的Sc和Zr合金化为Al-Zn-Mg合金：合金A（0 pct Sc + 0 pct Zr），合金B（0.19 pct Sc + 0.09 pct Zr）和合金C（0.19 pct Sc + 0.18 pct Zr）。Sc和Zr的合金化促进了Al-Zn-Mg合金的初相在冷轧过程中溶解到基体中，并通过随后的时效生成了Al ₃（Sc，Zr）沉淀。Sc和Zr的联合合金化抑制了Al-Zn-Mg合金的再结晶，并且通过两步溶液使晶粒更细，更均匀。织构的分布对于理解合金的微观结构演变很重要。Sc和Zr与两步溶液的组合合金化促进了立方织构{001} <100>的增加。包括Al ₃在内的微观组织演变（Sc，Zr）析出物，无沉淀区（PFZ）宽度，织构和再结晶是影响含Sc和Zr的Al-Zn-Mg合金耐蚀性的主要因素。经过两步固溶处理并经过两步时效的合金C具有最佳的抗应力腐蚀开裂（SCC）性能和最高的耐电化学腐蚀性能。