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材料工程  2016, Vol. 44 Issue (9): 8-15    DOI: 10.11868/j.issn.1001-4381.2016.09.002
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
硼酸-硫酸阳极氧化2A97 Al-Cu-Li合金在热带海洋大气环境中的初期腐蚀机理
骆晨1, Sergiu P. Albu2, 孙志华1, 汤智慧1, 陆峰1, Xiaorong Zhou2
1 北京航空材料研究院 航空材料先进腐蚀与防护航空科技重点实验室, 北京 100095;
2 曼彻斯特大学 材料学院, 英国 曼彻斯特 M13 9PL
Mechanism of Early Stage Corrosion for Boric-sulfuric Acid Anodized 2A97 Al-Cu-Li Alloy Under Tropical Marine Atmosphere
LUO Chen1, Sergiu P. Albu2, SUN Zhi-hua1, TANG Zhi-hui1, LU Feng1, Xiaorong Zhou2
1 Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2 School of Materials, The University of Manchester, Manchester M13 9PL, UK
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摘要 采用光学显微镜、扫描电镜、能谱仪、电化学阻抗谱测试结合超薄切片,分析阳极氧化2A97 Al-Cu-Li合金在大气腐蚀前后的微观形貌、化学成分及电化学性能。结果表明:在不同温度利用含有硼酸-硫酸或酒石酸-硫酸组合的电解液生长膜层时,硼酸添加和较高温度允许较大的电流密度通过,使膜生长加速;对于不同电解液,孔的几何构形和结构相似;硼酸-硫酸阳极氧化试样在热带海洋大气环境中暴露1个月后,出现主要由O,Al,Cl,Cu组成的分散性黑色锈斑,表面产生白色沉淀;随着户外暴露时间的延长,合金发生严重的点蚀并深入合金内部,腐蚀的扩展与θ相粒子有关。
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骆晨
Sergiu P. Albu
孙志华
汤智慧
陆峰
Xiaorong Zhou
关键词 硼酸-硫酸阳极氧化Al-Cu-Li合金大气腐蚀点蚀    
Abstract:Optical microscopy(OM), scanning electron microscopy(SEM), EDX and EIS combined with ultramicrotomy were employed to investigate the micro morphology, chemical composition and electrochemical properties of anodized 2A97 Al-Cu-Li alloy before and after atmospheric corrosion. The results show that when electrolytes containing combinations of tartaric-sulfuric or boric-sulfuric acid are used to grow the films at different temperatures, boric acid addition and higher temperature allow for higher current density that speeds up the film growth. The pore geometry and structure is similar for different electrolytes. Dispersive dark rusty spots composed of O, Al, Cl, Cu are present on the boric-sulfuric acid anodized specimen after exposure in tropical marine atmosphere for 1 month. Deposition of white corrosion product is found on the specimen surface as well. Severe pitting occurs and develops deeply into the alloy substrate after elongated outdoor exposure. Corrosion propagation is associated with θ-phase particles.
Key wordsboric-sulfuric acid anodizing    Al-Cu-Li alloy    atmospheric corrosion    pitting corrosion
收稿日期: 2015-12-31      出版日期: 2016-09-27
中图分类号:  TG174.4  
通讯作者: 骆晨(1984-),男,博士,高级工程师,主要从事腐蚀与防护研究工作,联系地址:北京市81信箱5分箱(100095),E-mail:chen.luo.23@qq.com     E-mail: chen.luo.23@qq.com
引用本文:   
骆晨, Sergiu P. Albu, 孙志华, 汤智慧, 陆峰, Xiaorong Zhou. 硼酸-硫酸阳极氧化2A97 Al-Cu-Li合金在热带海洋大气环境中的初期腐蚀机理[J]. 材料工程, 2016, 44(9): 8-15.
LUO Chen, Sergiu P. Albu, SUN Zhi-hua, TANG Zhi-hui, LU Feng, Xiaorong Zhou. Mechanism of Early Stage Corrosion for Boric-sulfuric Acid Anodized 2A97 Al-Cu-Li Alloy Under Tropical Marine Atmosphere. Journal of Materials Engineering, 2016, 44(9): 8-15.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.002      或      http://jme.biam.ac.cn/CN/Y2016/V44/I9/8
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