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| Corrosion Behavior and DFR Degradation Law of 2024-T3 Aluminium Alloy in Different Surface State |
| Received:December 29, 2019 Revised:January 14, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.06.008 |
| KeyWord:2024-T3 aluminium alloy accelerated corrosion test corrosion behavior detail fatigue rating (DFR) |
| Author | Institution |
| CHEN Yue-liang |
Qingdao Campus of Naval Aviation University, Qingdao , China |
| WU Xing-jun |
Qingdao Campus of Naval Aviation University, Qingdao , China |
| ZHANG Yong |
Qingdao Campus of Naval Aviation University, Qingdao , China |
| BIAN Gui-xue |
Qingdao Campus of Naval Aviation University, Qingdao , China |
| ZHANG Zhu-zhu |
Qingdao Campus of Naval Aviation University, Qingdao , China |
| ZHANG Yang-guang |
Qingdao Campus of Naval Aviation University, Qingdao , China |
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| Abstract: |
| The paper aims to study the corrosion behavior and fatigue deterioration law of aeronautical aluminium alloy specimens with damaged anodic oxide film under accelerated corrosion conditions in laboratory, and to compare with specimens with intact anodic oxide film.2024-T3 aluminium alloy specimens with different surface states were studied, accelerated corrosion tests of different time lengths and DFR experiments after accelerated corrosion were carried out. Corrosion behavior was observed by observing corrosion morphology, measuring pit depth and pitting corrosion rate. Degradation law of DFR was studied by calculating the DFR after corrosion. Corrosion pits appeared in 2024-T3 aluminium alloy specimens with intact and damaged anodic oxide film after 180 h and 36 of accelerated corrosion, respectively. The average corrosion pit depth and accelerated corrosion time coincided with power function relations. The degradation laws of DFR of the specimen with intact anodic oxide film and damaged anodic oxide film under accelerated corrosion in laboratory coincided with exponential function. Compared with the specimens with intact anodic oxide film, the damage of anodic oxide film would reduce the corrosion resistance of 2024-T3 aluminium alloy specimens and accelerate the degradation rate of fatigue property of specimens. |
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