ABSTRACT:Objective To investigate the influence of four typical atmospheric environments including marine atmosphere, dry-heat desert, low temperature and low barometric pressure in high altitude on the corrosion behavior of 7050 high-strength aluminum alloy. Methods Atmospheric exposure test of 7050 high-strength aluminum alloy was carried out four typical environments in Wanning, Dunhuang, Mohe and Lhasa. The corrosion rule and behavior of 7050 high-strength aluminum alloy in four typical atmospheric environments in China were investigated by corrosion weight loss, mechanical property, corrosion morphology and metallurgical microscope. Results After 1-year Exposure, marine atmosphere had a significant effect on the corrosion weight loss, mechanical property, corrosion morphology and metallographic microstructure of 7050 high-strength aluminum alloy. Dry-heat desert environment had an effect on thecorrosion morphology and metallographic microstructure of 7050 high-strength aluminum alloy. And 7050 high-strength aluminum alloy was not sensitive to the corrosion of atmospheric environments of low temperature and low barometric pressure in high altitude. Conclusion The result showed that the impact of the four typical environments on the corrosion of 7050 high-strength aluminum alloy was in the order of Wanning>Dunhuang>Mohe and Lhasa.%目的：研究海洋大气、干热沙漠、寒冷低温和高原低气压四种典型大气环境对7050高强铝合金腐蚀行为的影响。方法通过在万宁、敦煌、漠河、拉萨四种典型环境中开展7050高强铝合金大气暴露试验，利用腐蚀质量损失、力学性能、腐蚀形貌、金相显微分析7050高强铝合金在我国四种典型大气环境中的腐蚀规律和行为。结果暴露1年，海洋大气环境对7050高强铝合金的腐蚀质量损失、力学性能、腐蚀形貌和金相显微组织有明显影响，干热沙漠环境对铝合金的腐蚀形貌和金相显微组织有一定影响，铝合金对寒冷低温和高原低气压大气环境腐蚀不敏感。结论四种典型大气环境对7050高强铝合金腐蚀影响大小的顺序为万宁＞敦煌＞漠河和拉萨。
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