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| Comparison of Atmospheric Corrosivity of 2297-T87 Al-Cu-Li Alloy |
| Received:March 16, 2020 Revised:April 18, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.05.002 |
| KeyWord:atmospheric corrosion atmospheric corrosivity Al-Cu-Li alloy natural environmental test |
| Author | Institution |
| LUO Chen |
AECC Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| SUN Zhi-hua |
AECC Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| TANG Zhi-hui |
AECC Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| LU Feng |
AECC Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| The paper aims to evaluate the atmospheric corrosivity by the results of atmospheric corrosion testing of Al-Cu-Li alloy. Corrosion weight loss, corrosion rate, corrosion depth and tensile properties of a 3rd generation Al-Cu-Li alloy 2297-T87 after outdoor exposure in six natural environmental test sites were analyzed to systematically evaluate the atmospheric corrosivity in different regions. Corrosion was evident in 2297-T87 Al-Cu-LI alloy after exposure in Tuandao, Wanning and Yongxing Island. The corresponding corrosion weight loss and corrosion rate were approximately 2 times of those in Jiangjin, and 4 times of those in Xishuangbanna. Corrosion weight loss and corrosion rate in Beijing were the lowest. The changing trend of maximum corrosion depth of the alloy was in line as the corrosion weight loss and corrosion rate. Cross-sectional examination revealed severe pitting in the alloy after exposure in Wanning, Yongxing Island and Jiangjin with irregular pits formed underneath the corrosion product region. Intergranular corrosion was evident in the alloy after exposure in Tuandao. The tensile properties of alloy in Jiangjin, Yongxing Island, Wanning and Tuandao were similar and the tensile stress retention was over 90%. Using corrosion weight loss, corrosion rate and corrosion depth as characterization index, the sequence of atmospheric corrosivity in different test sites is determined as Beijing < Xishuangbanna <Jiangjin < Yongxing Island < Wanning < Tuandao. |
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