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| Corrosion Behavior of 7A85 Aluminum Alloy in Two Typical Atmospheric Environments |
| Received:March 22, 2020 Revised:April 09, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.07.013 |
| KeyWord:7A85 aluminum alloy atmospheric corrosion damp hot ocean atmospheric environment dry heat desert atmospheric environment |
| Author | Institution |
| ZHAO Quan-cheng |
Southwest Technology and Engineering Research Institute, Chongqing , China;Dunhuang Gansu Materials Corrosion in Atmospheric Environment, National Observation & Research Station, Dunhuang , China |
| LUO Lai-zheng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Xiao-feng |
Chongqing College of Electronic Engineering, Chongqing , China |
| SU Yan |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The paper aims to research influences of two typical atmospheric environments of damp hot ocean and dry-heat desert on corrosion behavior of 7A85 aluminum alloy. Atmospheric exposure tests of 7A85 aluminum alloy were carried out in Wanning and Dunhuang. The corrosion characteristics of 7A85 aluminum alloy in two typical atmospheric environments were investigated by metallographic microscope. The tensile strength and corrosion depth of the material were tested regularly. After 7A85 aluminum alloy was exposed for 3 years in damp hot ocean atmospheric environment and dry heat desert atmospheric environment, the maximum corrosion depth was 254 μm and 90 μm respectively; the tensile strength was reduced by 18% and 5% respectively; and the elongation after fracture was reduced by 72% and 22% respectively. If 7A85 aluminum alloy is exposed in dry-heat desert environment with low relative humidity, the further corrosion would be prevented by the corrosion product film formed on the surface. The corrosion of 7A85 aluminum alloy exposed to the damp hot ocean environment will be gradually deepened with the extension of the exposure time. |
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