针对老龄飞机7150铝合金结构普遍存在的剥蚀问题，在海洋性盐雾环境下，通过T73时效态不受载和悬臂梁加载剥蚀试验，以及T77时效态波音737CL龙骨梁下缘条不受载和受载剥蚀试验，研究了正应力对 7150铝合金剥蚀的影响。结果表明：T73时效态剥蚀，L轴向拉应力作用表面最轻，其次为不受载表面，L轴向压应力作用表面最严重。T77时效态龙骨梁下缘条剥蚀，在L轴向压应力作用下的产生和扩展速度，比不受载状态下快得多。由此认为：L轴向压应力可以加速7150铝合金剥蚀的形成和扩展，而L轴向拉应力可以抑制剥蚀的形成和扩展。
The effects of axial stress on exfoliation corrosion (EFC) of T73 tempered and T77 tempered 7150 alloy were investigated based on EFC test with loading and without loading respectively in oceanic environment. It was found that EFC on T73 tempered specimen without stress was severer than that with tension stress of L axis, but milder than that with compression stress of L axis. The development of EFC on T77 tempered specimen with compression stress of L axis was much quicker than that without stress. It could be concluded that compression stress of L axis can accelerate EFC and tension stress of L axis can reduce EFC.
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