[1]麻彦龙.非均匀微观组织对AA2099-T8新型铝锂合金耐腐蚀性能的影响[J].中国材料进展,2015,(预先出版):006-10.
 Ma Yanlong,Effect of heterogeneous microstructure on corrosion resistance of the new-type aluminum-lithium alloy AA2099-T8[J].MATERIALS CHINA,2015,(预先出版):006-10.
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非均匀微观组织对AA2099-T8新型铝锂合金耐腐蚀性能的影响()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2015年预先出版期
页码:
006-10
栏目:
特约研究论文
出版日期:
2015-10-15

文章信息/Info

Title:
Effect of heterogeneous microstructure on corrosion resistance of the new-type aluminum-lithium alloy AA2099-T8
作者:
麻彦龙12
1. 重庆理工大学材料科学与工程学院
2. 重庆市模具技术重点实验室(重庆理工大学)
Author(s):
Ma Yanlong 1 2
关键词:
铝锂合金微观组织局部腐蚀阳极氧化
文献标志码:
A
摘要:
综述了第三代新型铝锂合金在微观组织、腐蚀及阳极氧化方面的最新研究进展,重点分析了AA2099-T8合金的微观组织对合金阳极氧化前后耐腐蚀性能的影响。研究发现:在3.5%NaCl溶液中,AA2099-T8合金上发生亚稳态局部腐蚀和严重局部腐蚀两类腐蚀,前者主要由Al-Fe-Mn-Cu-(Li)第二相颗粒引起,而后者则与热机械加工过程中的局部塑性变形及T1(Al2CuLi)相的非均匀析出有关;在酒石酸-硫酸阳极氧化(TSA)条件下,Al-Fe-Mn-Cu-(Li)第二相颗粒的阳极氧化行为明显不同于铝合金基体,结果破坏了阳极氧化膜的连续性,进而对阳极氧化处理合金的耐腐蚀性能产生不利影响。
Abstract:
State-of-the-art research progress on microstructure, corrosion resistance and anodizing behavior of the third generation aluminum-lithium alloys has been reviewed, with particular focus on the effect of microstructure on corrosion resistance of the new-type aluminum-lithium alloy AA2099-T8 before and after anodizing. It was found that two types of localized corrosion occurred in the alloy in 3.5% NaCl solution, namely metastable localized corrosion and severe localized corrosion. The metastable localized corrosion is ascribed to Al-Fe-Mn-Cu-(Li) constituent particles while the severe localized corrosion is associated with localized plastic deformation and heterogeneous precipitation of the T1(Al2CuLi) phase. During tartaric-sulphuric acid anodizing (TSA), the Al-Fe-Mn-Cu-(Li) constituent particles behaved differently compared with the alloy matrix, leading to the formation of discontinuities in the anodic film, which deteriorates the corrosion resistance of the anodized alloy.
更新日期/Last Update: 2015-07-31