摘要
根据波音737飞机龙骨梁下缘条更换修理BS540.6位置处T6态和T77态7150铝合金结构腐蚀规律和采用TEM获得的合金晶界微观组织结构,研究了T6态和T77态7150铝合金剥蚀根源。结果表明:T77态比T6态抗剥蚀性能好得多。T6态晶界η析出相分布连续,基体边缘无明显PFZ;T77态基体边缘PFZ连续分布,晶界η析出相不连续。T6态和T77态的剥蚀根源分别为晶界η析出相和PFZ作为阳极被腐蚀溶解。
The exfoliation fracture corrosion（EFC） origin of 7150 alloy at different aging states（T6 and T77） was investigated based on the EFC laws of Boeing 737 keel beam lower chord replacement area at BS540.6 and the microstructure of grain boundary with TEM.The results show that T77 has better resistance to EFC than T6.Continuous η precipitate phases exist on the grain boundary of T6 with no PFZ.Continuous PFZ and dispersed η phases are observed on the grain boundary of T77.The EFC origins of T6 and T77 are the corrosion of η phase and the PFZ as anode,respectively.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2012年第3期54-57,共4页
Nonferrous Metals（Extractive Metallurgy)
关键词
波音737
剥蚀
时效态
η析出相
PFZ
基体
原因
Boeing 737
exfoliation corrosion
aging state
η precipitate phase
PFZ
matrix
reason
