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| STUDY ON EXFOLIATION BEHAVIOUR OF LY12 ALUMINIUM ALLOY |
| Li Di;Zuo Shangzhi;Guo Baolan(Beijing University of Aeronautics and Astronautics) |
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Abstract The exfoliation behaviour of LY12 alloy in the EXCO solution was studied by metallography and electrical resistance methods.The main experimental results are as follows. During the exfoliation development,pitting occurred at first,then followed by intergranular corrosion.Exfoliation took place as a result of the combination of corrosion and tensile stress.A logarithmic relationship between corrosion depth and immersion duration was observed. However,the first and the second steps have different slopes.The peak aged LY12 alloy was found more susceptible to exfoliation than the naturally aged alloy.
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Received: 25 June 1995
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| 1ShafferIS,SebastionJC,RosenfeldMS,KetchanSJ．J．Materials,1968,3(2):4002KetchanSJ,ShafferIS．ASTMSTP,1972,516:33GalveleJR,MicheliSM,CorrosionScience,1970,10:7954李获,张玉梅,郭宝兰,宋成兵．铝合金剥蚀速率测试方法的研究,腐蚀与防护技术论文集,中国腐蚀与防护学会航空航天专业委员会、航空航天工业部航空表面技术专业委员会编辑委员出版,1992．2435王祝堂主编．铝材及其表面处理手册,南京:江苏科学技术出版社,1992．2986HB5455-90铝合金剥层腐蚀试验方法 |
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