针对老龄飞机7150合金飞机结构普遍存在的剥蚀问题，采用海洋性环境腐蚀试验、透射电子显微镜观测等手段，研究了T6、T73和T77时效态7150合金剥蚀行为。研究结果表明：T77时效态抗剥蚀性能最好，T6时效态抗剥蚀性能最差，T73 时效态介于T77和T6时效态之间。7150-T77合金晶界腐蚀产物的锲力，尚不足以提供其剥蚀扩展所需动力。7150合金时效后的晶界微观组织结构，是抗剥蚀性能的重要决定因素。
The effects of temper on EFC of 7150 alloy, which is prevalent on aging airplane structure, had been investigated by means of corrosion test on T6, T73 and T77 temper in oceanic environment and transmission electron microcopy (TEM). The test results shown that T77 temper was the best for EFC resistance, T73 temper was the next and T6 temper was the worst. The test results also shown that the wedging stress produced by the corrosion product at the grain boundary of 7150-T77 alloy can not sustain the EFC development. TEM observation shown that continuous η phase existed at the grain boundary of T6 temper. The grain boundary of T73 and T77 temper had PFZ zone and dispersed η phase. The PFZ of T77 temper was thicker than T73 temper. The particles of η phase at the grain boundary of T77 temper were coarser than T73 temper. We can draw a conclusion that the microstructure in grain boundary zone of 7150 alloy is the key factor to the EFC resistance.
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