采用金相显微镜、扫描电子显微镜和Х射线衍射仪显微分析技术,研究了强化固溶工艺对含Sr 2099（Al-2.52Cu-1.87Li-1.19Zn-0.497Mg-0.309Mn-0.0825Zr-0.0605Sr）型铝锂合金抗晶间腐蚀和抗剥落腐蚀性能的影响。结果表明：与常规固溶（540℃×2 h）＋T8时效（121℃×14 h＋151℃×48 h）工艺相比,强化固溶（540℃×2 h＋550℃×2.67 h）＋T8时效（121℃×14 h＋151℃×48 h）工艺显著减少了合金中的粗大未溶相,再结晶程度提高,细化了晶粒,且促进等轴晶的形成。按晶间腐蚀标准（GB7998-2005）和剥落腐蚀标准（GB/T 22639-2008）,强化固溶＋T8时效工艺降低了该合金的抗晶间腐蚀能力,但显著提高了该合金的抗剥落腐蚀能力。
The effects of enhanced solid solution treatment on intergranular corrosion and exfoliation corrosion behavior of Sr microalloyed 2099 （ A1-2.52Cu-1.87Li-1.19Zn-0. 497Mg-0. 309Mn-0. 0825Zr-0. 0605Sr） A1-Li alloy were investigated by means of optical microscope, SEM and XRD. The results show that compared to the conventional solid solution treatment（540 ℃× 2 h） plus T8 aging（ 121 ℃×14 h ＋151 ℃×48 h）, enhanced solid solution（540 ℃× 2 h ＋550 ℃× 2.67 h） plus T8 aging can decrease coarse precipitated phases significantly, promote recrystallization, refine grains and increase the formation of equiaxed grains of the 2099-Sr Al-Li alloy. It is found that enhanced solid solution plus T8 aging decreases the resistance of intergranular corrosion, but improves the resistance of exfoliation corrosion for 2099-Sr Al-Li alloy.
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