中文摘要：

利用C型环试样、单轴加载的拉伸试样和预制裂纹的试样研究了高强度铝合金在大气环境下的应力腐蚀性能，并与实验室加速试验结果进行对比。施加应力后的试样分别暴露于北京、团岛、万宁3个不同的大气试验站，同时在实验室进行了C型环试样在3．5％NaCl溶液中周期浸润腐蚀试验、单轴拉伸试样在3％NaCl＋0．5％H2O2溶液中的拉伸应力腐蚀试验和预制裂纹的试样在3．5％NaCl溶液中腐蚀试验。结果表明，高强度铝合金在不同环境中产生应力腐蚀的敏感性不同，在海洋性环境下应力腐蚀性较高；在海洋性环境下2A12铝合金的应力腐蚀的敏感性比7A04铝合金高，在暴露期间未开裂的2A12铝合金C环试样发生严重剥落腐蚀，未开裂的7A04铝合金C环试样则遭受严重点腐蚀；3．5％NaCl溶液中周期浸润腐蚀试验和3％NaCl＋0．5％H20：溶液中的拉伸应力腐蚀试验作为高强铝合金SCC敏感性判定方法，模拟海洋大气腐蚀过程，与户外的试验结果具有较好的相关性。

英文摘要：

An investigation of the stress corrosion cracking resistance of high strength aluminum alloys 2A12 and 7A04 in different atmospheric environments were presented, results were compared with those obtained in labo- ratory accelerated tests. C-ring and direct tension stress corrosion specimens were taken from the short transverse grain and the longitudinal direction of aluminum alloy stick respectively, applied stress levels were 60, 70, 80 and 90 percent of the σ02. The atmospheric stress corrosion tests were exposed to three different atmospheric test stations in China, one in Beijing, typical semi-rural atmosphere, others in coastal city, Qingdao （East of Chi- na） and Wanning （South of China）. In the meantime, ahemate immersion and direct tension stress corrosion im- mersion in salt solution were conducted in laboratory condition. The results showed that SCC performance of alu- minum alloys could be evaluated within one year in marine atmospheric environment, otherwise, only exfoliation corrosion or pitting was observed. The alternate corrosion results showed that SCC of aluminum alloy was consis- tent with outdoor exposed samples in the marine atmospheric environment.