研究了在3.5%NaCl水溶液(质量分数,下同)中性盐雾环境中,带有局部包铝层的2024和7B04高强铝合金轴向疲劳板材光滑试样的腐蚀。发现疲劳试样表面的局部包铝层不仅保护其覆盖区域不被腐蚀,同时也间接减轻了其未覆盖区域的腐蚀程度。这主要是由于局部包铝层的存在减小了其未覆盖区域的腐蚀面积,而铝合金腐蚀面积的减小会造成腐蚀程度降低。腐蚀面积的变化对2024铝合金影响较小,造成腐蚀深度的减小;对7B04铝合金影响较大,可以使其不发生点腐蚀。
Abstract
The pitting of 2024 and 7B04 aluminum alloy plate fatigue samples with partial aluminum clad in 3.5% NaCl NSS(Neutral Salt Spray Test) was investigated.It was found that the partial aluminum clad not only protected the covered area from corrosion but also decreased the pitting probability of uncovered area indirectly,because the reducing of corrosion area decreased the pitting probability of aluminum alloy.As the area reduced,the pitting expansion of 2024 aluminum alloy samples slowed and the pitting probability of 7B04 aluminum alloy samples became zero.
关键词
铝合金 /
包铝层 /
疲劳 /
腐蚀
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Key words
partial aluminum all /
aluminum clad /
fatigue /
pitting
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参考文献
秦剑波,王生楠,刘亚龙,等.LY12CZ铝合金预腐蚀及疲劳损伤研究[J].材料工程,2006,(3):14-17.
吴学仁,刘建中.基于小裂纹理论的航空材料疲劳全寿命预测[J].航空学报,2006,27(2):219-226.
张有宏,常新龙,张世英,等.铝合金结构腐蚀损伤性能评价指标[J].试验技术与试验机,2007,(4):5-7.
GRUENBERG K M,CRAIG B A.Predicting fatigue life of pre-corroded 2024-T3 aluminium[J].International Journal of Fatigue,2004,26(6):629-640.
柴志刚,陈荣,张栋.1420合金预腐蚀疲劳性能研究[J].装备环境工程,2005,2(2),1-5.
贺小帆,刘文,王忠波,等.预腐蚀对疲劳寿命分布特性及参数影响的初步研究[J].航空材料学报,2007,27(6):21-26.
朱立群,谷岸,刘慧丛,等.典型高强铝合金材料的点腐蚀坑前缘特征的研究[J].航空材料学报,2008,28(6):51-66.
汝继刚,伊琳娜.不同时效处理对7804铝合金腐蚀性能的影响[J].轻合金加工技术,2004,32(5):45-47.
吴昊,李松梅,刘建华,等.新型Al-Zn-Mg-Cu合金的应力腐蚀行为研究[J].飞机设计,2006,3:11-16.
AZIZ P M,GODARD Hugh P.Influence of specimen area on the pitting probability of aluminum[J].J Electrochem Soc,1955,102(10):577-579.
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