A critical consideration for the use of Al-cladding for protecting aircraft aluminum alloy 2024 against corrosion
A critical consideration for the use of Al-cladding for protecting aircraft aluminum alloy 2024 against corrosion
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DOI：
10.1016/j.tafmec.2011.12.006
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发表时间：
2012-02-01
影响因子：
5.3
通讯作者：
Kermanidis, Al. Th.
中科院分区：
文献类型：
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作者：
Pantelakis, Sp. G.;Chamos, A. N.;Kermanidis, Al. Th.
对采用铝包层作为航空铝合金2024防腐保护措施的必要性进行了实验研究。对裸露的和覆铝的2024个试件进行了预腐蚀，然后进行了力学测试。由于认识到缺乏实验室模拟飞机结构在服役条件下预期的腐蚀损伤的概念，在本工作中，采用了两种不同的实验室腐蚀试验，即合金在3.5%的氯化钠溶液中的浸泡试验和剥落腐蚀试验来对试件进行预腐蚀。对于侵蚀性剥落腐蚀环境，铝包层的保护作用是保证2024合金良好的拉伸和疲劳性能的关键。另一方面，结果表明，对于温和的3.5%氯化钠溶液环境，熔覆层的使用降低了材料的疲劳性能，从而引发了对涉及熔覆层的必要性的怀疑。结果表明，需要系统地努力制定概念，以便能够在实验室模拟服役期间积累的腐蚀。(C)2012爱思唯尔有限公司。保留所有权利。
The necessity of involving Al cladding as a means of protecting the aircraft aluminum alloy 2024 against corrosion has been assessed experimentally. Bare as well as Al-clad protected 2024 specimens were pre-corroded and then subjected to mechanical tests. By recognizing the lack on validated concepts for the laboratory simulation of the corrosion damage expected in the service conditions of an aircraft structure, in the present work two different laboratory corrosion tests, namely the immersion of the alloy in a 3.5% NaCl solution, and the exfoliation corrosion test have been employed for pre-corroding the specimens. For the case of the aggressive exfoliation corrosion environment the protective role of Al-cladding is essential for ensuring the good tensile and fatigue behavior of the 2024 alloy. On the other hand, the results have shown that for the case of the mild 3.5% NaCl solution environment, the use of a cladding layer downgrades the fatigue behavior of the material, thus giving raise to doubt on the need of involving cladding. The results demonstrate the need for systematic efforts for the development of concepts which will allow the laboratory simulation of corrosion accumulated in service. (c) 2012 Elsevier Ltd. All rights reserved.