| 赵全成,罗来正,黎小锋,苏艳.两种典型大气环境下7A85铝合金的腐蚀行为研究[J].装备环境工程,2020,17(7):70-75. ZHAO Quan-cheng,LUO Lai-zheng,LI Xiao-feng,SU Yan.Corrosion Behavior of 7A85 Aluminum Alloy in Two Typical Atmospheric Environments[J].Equipment Environmental Engineering,2020,17(7):70-75. |
| 两种典型大气环境下7A85铝合金的腐蚀行为研究 |
| Corrosion Behavior of 7A85 Aluminum Alloy in Two Typical Atmospheric Environments |
| 投稿时间：2020-03-22 修订日期：2020-04-09 |
| DOI：10.7643/issn.1672-9242.2020.07.013 |
| 中文关键词: 7A85铝合金 大气腐蚀 湿热海洋大气环境 干热沙漠大气环境 |
| 英文关键词:7A85 aluminum alloy atmospheric corrosion damp hot ocean atmospheric environment dry heat desert atmospheric environment |
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| Author | Institution |
| ZHAO Quan-cheng | Southwest Technology and Engineering Research Institute, Chongqing 400039, China;Dunhuang Gansu Materials Corrosion in Atmospheric Environment, National Observation & Research Station, Dunhuang 736200, China |
| LUO Lai-zheng | Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
| LI Xiao-feng | Chongqing College of Electronic Engineering, Chongqing 401331, China |
| SU Yan | Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
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| 中文摘要: |
| 目的 研究湿热海洋、干热沙漠两种典型大气环境对7A85铝合金腐蚀行为的影响。方法 在万宁、敦煌两种典型环境中开展7A85铝合金大气暴露试验，利用金相显微镜分析7A85铝合金在我国两种典型大气环境中的腐蚀特征，定期测试该材料的拉伸强度和腐蚀深度。结果 暴露3 a，7A85铝合金湿热海洋、干热沙漠两种典型大气环境中的最大腐蚀深度分别为254、90 μm，抗拉强度分别下降了18%和5%，断后伸长率分别下降了72%和22%。结论 7A85铝合金暴露于相对湿度较低的干热沙漠环境，表面形成的腐蚀产物膜会阻止腐蚀的进一步发生；暴露于湿热海洋大气环境，随暴露时间的延长，7A85铝合金腐蚀逐渐加深。 |
| 英文摘要: |
| 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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