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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。
Based on AA2099-T8 alloy, the latest progress in the research on microstructure, corrosion behavior and anodization of the third generation new Al-Li alloy is reviewed comprehensively. The effects of microstructure of the alloy on corrosion resistance before and after anodic oxidation of alloy influences. The results show that metastable localized corrosion and severe localized corrosion occur on AA2099-T8 alloy in 3.5% NaCl solution. The former is mainly caused by Al-Fe-Mn-Cu- (Li) second phase particles , While the latter is related to the local plastic deformation during thermomechanical processing and the non-uniform precipitation of T 1 (Al 2 CuLi) phase. Under tartaric acid-sulfuric acid anodization (TSA) conditions, the anodic oxidation behavior of the second phase particles of Al-Fe-Mn-Cu- (Li) is obviously different from that of the aluminum alloy matrix and the continuity of the anodized film is destroyed. The corrosion resistance of the treated alloy is adversely affected.