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采用金相显微镜、慢应变速率拉伸试验(SSRT)、定氢仪、透射电镜等研究了7050铝合金在EXCO溶液中的腐蚀与氢脆行为及其对合金拉伸性能的影响。结果表明:随着合金在溶液中浸泡时间的延长,腐蚀特征由点蚀向剥蚀发展,并且有氢脆效应产生。腐蚀和氢脆共同作用大大降低了合金的拉伸性能。通过去除腐蚀层后继续拉伸定量分析了氢脆影响下合金的剩余强度和延伸率,当浸泡时间达64 h时,氢脆使合金的剩余强度和延伸率分别降至68.2%和60.2%。
The corrosion and hydrogen embrittlement behavior of 7050 aluminum alloy in EXCO solution and its effect on the tensile properties of the alloy were investigated by optical microscope, slow strain rate tensile test (SSRT), hydrogen deposition and transmission electron microscopy. The results show that with the extension of the soaking time of the alloy in solution, the corrosion features develop from pitting corrosion to denudation and hydrogen embrittlement effect occurs. The combined effect of corrosion and hydrogen embrittlement greatly reduces the tensile properties of the alloy. Hydrogen embrittlement reduced the residual strength and elongation of the alloy to 68.2% and 60.2% when the soaking time reached 64 h. The residual strength and elongation of the alloy under the influence of hydrogen embrittlement were analyzed quantitatively by removing the corrosion layer.