摘要
围绕AA2099-T8合金,全面综述了第三代新型铝锂合金在微观组织、腐蚀行为及阳极氧化等方面取得的最新研究进展,重点分析了该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%Na Cl溶液中,AA2099-T8合金上发生了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,后者则与热机械加工过程中的局部塑性变形及T_1(Al_2CuLi)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,破坏了阳极氧化膜的连续性,对阳极氧化处理合金的耐腐蚀性能产生不利影响。
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 re- sistance of the new-type aluminum-lithium alloy AA2099-T8 before and after anodizing. It was found that two types of local- ized corrosion occurred in the alloy in 3.5% NaCl solution, namely metastable localized corrosion and severe localized corro- sion. The metastable localized corrosion is ascribed to Al-Fe-Mn-Cu-（Li） constituent particles while the severe localized cor- rosion is associated with localized plastic deformation and heterogeneous precipitation of the T1 （Al2CuLi） phase. During tar- taric-sulphuric acid anodizing （TSA）, the A1-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.
出处
《中国材料进展》
CAS
CSCD
北大核心
2015年第12期928-932,共5页
Materials China
基金
国家自然科学基金(51301214
51441002)
重庆市基础与前沿研究计划项目(cstc2013jcyjA50017)
留学回国人员科研启动基金(第47批)
关键词
铝锂合金
微观组织
局部腐蚀
阳极氧化
aluminum-lithium alloy
microstructure
localized corrosion
anodizing
