波音737cl龙骨梁bs535区域腐蚀规律及剥蚀成因研究

simon · 发表于 2010-7-27 18:44:26

波音737CL龙骨梁BS535区域腐蚀规律
黄昌龙1,2 万小朋1
（1.西北工业大学航空学院，陕西西安，710072；
2. 广州民航职业技术学院，广东广州，510403）
摘要：本文针对波音737CL老龄飞机龙骨梁下缘条BS535区域普遍存在的腐蚀，根据腐蚀现象以及腐蚀环境、应力分析，并采用TEM手段以及海洋性盐雾环境腐蚀试验，研究了腐蚀规律及其原因。结果表明：剥蚀为波音737CL龙骨梁下缘条BS535区域主要腐蚀类型，空调舱冷凝水溶液是腐蚀的外因，龙骨梁下缘条挤压型材扁平状晶粒以及沿晶界连续分布的无弥散区是剥蚀的内因，压应力加速了剥蚀扩展。
关键词：老龄飞机；龙骨梁；剥蚀；拉长晶粒；无弥散区；压应力
Corrosion character of 737CL keel beam at BS535
HUANG Changlong1,2, WAN Xiaopeng1
(1. Aeronautics school, Northwestern Polytechnic University. Xi’an 710072, China
2. Guangzhou Civil Aviation College. Guangzhou 510403,China)
ABSTRACT: Corrosion character and causes on the keel beam lower chord of 737CL at BS535 area, which is prevalent on aging airplane, were investigated based on the corrosion signs, environment, stress, TEM and corrosion test in oceanic environment. The results showed that the main type of corrosion was EFC. The condensed water in air-condition bay provided the corrosive environment. The intrinsic factors of EFC include the elongated grains and the continuous PFZ along the grain boundary of the material. Compression stress accelerated EFC.
KEY WORDS: aging airplane; keel beam; EFC; elongated grain; PFZ; compression stress