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| Corrosion Behavior of 7B50 Aluminum Alloy in Four Typical Atmospheric Environments |
| Received:March 11, 2021 Revised:May 14, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.11.020 |
| KeyWord:7B50 aluminum alloy 7B50-T7751 7B50-T77511 atmospheric environment exposure test corrosion behavior |
| Author | Institution |
| NPZHONG Yong |
Southwest Institute of Technology and Engineering, Chongqing , China |
| SU Yan |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LUO Lai-zheng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WU Yang |
Southwest Institute of Technology and Engineering, Chongqing , China;National Field Scientific Observation and Research Station for Atmospheric Material Corrosion in Mohe, Mohe , China |
| YANG Hua-ming |
Southwest Institute of Technology and Engineering, Chongqing , China;National Field Scientific Observation and Research Station for Atmospheric Material Corrosion in Lhasa, Lhasa , China |
| CHEN Xi-dong |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan National Field Scientific Observation and Research Station for Atmospheric Environment and Material Corrosion, Wanning , China |
| ZHAO Quan-cheng |
Southwest Institute of Technology and Engineering, Chongqing , China;National Field Scientific Observation and Research Station for Atmospheric Environment and Material Corrosion in Dunhuang, Dunhuang , China |
| WU Shuai |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHU Yu-qin |
Southwest Institute of Technology and Engineering, Chongqing , China |
| SHU Chang |
Southwest Institute of Technology and Engineering, Chongqing , China |
| TENG Jun-peng |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The paper aims to research the corrosion behavior of 7B50 aluminum alloy in four typical atmospheric environments:damp hot ocean, dry-heat desert, cold countryside and warm plateau. The corrosion behaviors and rules of 7B50-T7751 and 7B50-T77511 aluminum alloys in different atmospheric environments were investigated and compared by test the macroscopic corrosion morphology, the metallographic microscope, the corrosion depth and the tensile strength of the material. After exposed for 3 years, the corrosion of 7B50-T7751 aluminum alloy was serious in damp hot ocean atmospheric environment, the local maximum corrosion depth was 166 μm, the tensile strength and elongation after fracture decreased by 5% and 25%, respectively. And the corrosion was secend in dry-heat desert atmospheric environment, the local maximum corrosion depth was 44 μm. And no obvious corrosion was found in cold countryside and warm plateau atmosphere environment. However, when exposed to the damp hot ocean, dry-heat desert, cold countryside and warm plateau atmospheric environment, the 7B50-T77511 aluminum alloy showed obvious corrosion. The local maximum corrosion depths were 141, 80, 42 and 29 μm, respectively. The corrosion resistance of 7B50 aluminum alloy in typical atmospheric environment is different, it mainly presents the mixed corrosion of pitting corrosion and intergranular corrosion, and it has obvious tendency of intergranular corrosion and denudation. And the corrosion resistance of 7B50-T7751 plate is slightly better than that of 7B50-T77511 profile when exposed to the same atmospheric environment. |
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