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| The Influence of Different Enviroments on Stress Corrosion Cracking |
| 北京航空材料研究院 |
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Abstract An investigation of the stress corrosion cracking resistance of high strength aluminum alloys 2A12 and 7A04 in different atmospheric environment were presented, results were compared with those obtained in laboratory 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 level were 60, 70, 80 and 90 percent of the σ0.2. 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 China) and Wanning (South of China). In the meantime, alternate immersion and direct tension stress corrosion immersion in salt solution were conducted in laboratory condition. The results showed that SCC performance of aluminum 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 consistent with outdoor exposed samples in the marine atmospheric environment.
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Received: 06 November 2006
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