2197铝锂合金在不同热处理状态下的晶间腐蚀及剥蚀行为
Intergranular Corrosion and Exfoliation Corrosion Behaviors of 2197 Al-Li Alloy with Different Aging Treatments
摘 要
研究了T6和T8态两种时效状态下的2197铝锂合金的晶间腐蚀和剥蚀行为.结果表明,随时效时间延长,晶界T1相数量及晶界无沉淀带宽度增加,合金晶间腐蚀和剥蚀敏感性增加;更低的时效温度和时效前的预变形,促进T1相析出,并使无沉淀析出带宽度减小,因此T8态的耐蚀性优于T6态.通过电化学阻抗谱可准确地判断合金的剥蚀敏感性,由此判断出的剥蚀发生时间和剥蚀敏感性与通过剥蚀照片观察的结果一致.
晶间腐蚀
剥蚀
电化学阻抗谱
2197 Al-Li alloy
intergranular corrosion
exfoliation corrosion
electrochemical impedance spectruscopy
Abstract
The intergranular corrosion and exfoliation corrosion behaviors of 2197 Al-Li alloy with T6 temper and T8 temper were investigated.The results show that with the increase of aging time,the number of T1 phase and precipitate-free zone(PFZ) at grain boundaries increased,and the susceptibility to intergranular corrosion and exfoliation corrosion was enhanced.The corrosion resistence of the alloy under T8 condition was better than that under T6 condition,because lower aging temperatured and pre-deformation prior to aging promoted T1 phase precipitation and minimize PFZ at grain boundaries.The susceptibility to exfoliation corrosion estimated by the electrochemical impedance spectruscopy(EIS) was the same as the one estimated by exfoliation photograph observesion.
中图分类号 TG172 TG146.2
所属栏目 试验研究
基金项目 民口配套项目:(MKPT-2004-19ZD)
收稿日期 2008/12/22
修改稿日期 2009/2/2
网络出版日期
作者单位点击查看
备注郑子樵,博士生导师.
引用该论文: CHEN Yuan-yuan,ZHENG Zi-qiao,WEI Xiu-yu,PAN Zheng-rong,LI Shi-chen. Intergranular Corrosion and Exfoliation Corrosion Behaviors of 2197 Al-Li Alloy with Different Aging Treatments[J]. Corrosion & Protection, 2010, 31(1): 29～33
被引情况:
【1】马灿,谭澄宇,覃思思,李杰,蒋建辉, "时效对7056铝合金在EXCO溶液中剥落腐蚀行为的影响",腐蚀与防护 37, 93-99(2016)
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【3】HE Bin,SUN You-chao,FAN Wei-xun.Influence of exfoliation corrosion on the fatigue of aluminium alloy[J].Journal of Nanjing University of Aeronautics and Astronautics,1998,30(3):306-310.
【4】GB 7998-1987.Standard test method for intergranular corrosion susceptibility in Al alloys[S].
【5】ASTM G34-1979.Standard Test Method for Exfoliation corrosion susceptibility in 2××× and 7××× series aluminium alloys(EXCO test)[S].
【6】JIANG Na,LI Jin-feng,ZHENG Zi-qiao,et al.Effect of aging on mechanical properties and localized corrosion behaviors of Al-Cu-Li alloy[J].Trans Nonferrous Met Soc China,2005,15(1):23-29.
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【9】Kumai C,Kusinski J,Thomas G,et al.Influence of aging at 200 ℃ on the corrosion resistance of Al-Li and Al-Cu-Li alloys[J].Corrosion,1989,45(4):294-302.
【10】Keddam M,Kuntz C,Takenouti H,et al.Exfoliation corrosion of aluminum alloys examined by electrode impedance[J].Electrochimica Acta,1997,42(1):87-97.
【11】曹楚南,王佳,林海潮.氯离子对钝态金属电极阻抗频谱的影响[J].中国腐蚀与防护学报,1989,9(4):261-270.
【12】Conde A,Damborenea J de.Evaluation of exfoliation susceptibility by means of the electrochemical spectroscopy[J].Corros Sci,2000,42(8):1363-1377.
【13】Conde A,Dambonea J de.Electrochemical modelling of exfoliation corrosion behavior of 8090 alloy[J].Electrochimi Acta,1998,43(8):849-860.
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