Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet

doi:10.11900/0412.1961.2018.00519

Acta Metall Sin

2019, Vol. 55

Issue (8): 958-966 DOI: 10.11900/0412.1961.2018.00519

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Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet

Chao CAI¹(

),Yang LI¹,Jinfeng LI²,Zhao ZHANG³,Jianqing ZHANG³

1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
3. Department of Chemistry, Zhejiang University, Hangzhou 310058, China

Cite this article:

Chao CAI,Yang LI,Jinfeng LI,Zhao ZHANG,Jianqing ZHANG. Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet. Acta Metall Sin, 2019, 55(8): 958-966.

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Abstract

The microstructures and open circuit potential (OCP) of 2A97 Al-Li alloy sheets with different ageing and their corrosion features in intergranular corrosion (IGC) medium were investigated. As the extension of ageing time, T₁ (Al₂CuLi) phases are precipitated, the alloy potential is decreased, which is accompanied with the following corrosion mode evolution: pitting, IGC (including local IGC and general IGC) and pitting again. Meanwhile, with ageing progress, the IGC depth is increased firstly and then decreased. Compared to T6 ageing, T8 ageing accelerates the precipitation of T₁ phases, the potential therefore decreases more quickly. After a certain ageing, the lower the potential, the smaller the IGC degree, and the greater the pitting degree. A correlation between OCP and corrosion mode was proposed, which may be used to compare the IGC sensitivity of Al-Li alloy with different tempers.

Key words: Al-Li alloy ageing precipitation intergranular corrosion potential

Received: 16 November 2018

ZTFLH:

TG113

Fund: National Natural Science Foundation of China (No.51741107)(No.51741107);Major Innovation Projects for Building First-Class Universities in China's Western Region(No.ZKZD17003);National First-Class Discipline Construction Project of Ningxia(No.NXYLXK2017A04)

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	Chao CAI
	Yang LI
	Jinfeng LI
	Zhao ZHANG
	Jianqing ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00519 OR https://www.ams.org.cn/EN/Y2019/V55/I8/958

Fig.1 Typical sectional corrosion morphologies of 2A97 Al-Li alloy with T6 ageing after corrosion test for 2 h (a), 4 h (b), 58 h (c) and 120 h (d)

Table 1 Corrosion type and maximum corrosion depth of 2A97 Al-Li alloy with T6 ageing after corrosion test for different time

Fig.2 Typical sectional corrosion morphologies of 2A97 Al-Li alloy with T8 ageing after corrosion test for 2 h (a), 4 h (b), 36 h (c) and 120 h (d)

Table 2 Corrosion type and maximum corrosion depth of 2A97 Al-Li alloy with T8 ageing after corrosion test for different time

Fig.3 Polarization curves of 2A97 Al-Li alloy sheet with T6 ageing for different time

Fig.4 Open circuit potential of 2A97 Al-Li alloy sheet with T6 and T8 ageing for different time in 3.5%NaCl solution

Fig.5 TEM images of 2A97 Al-Li alloy with T6 ageing for 4 h (a, b), 12 h (c, d) and 60 h (e, f)(a, c, e) <100>_Al direction (b, d, f) <112>_Al direction

Fig.6 TEM images of 2A97 Al-Li alloy with T8 ageing for 4 h (a, b), 16 h (c, d) and 40 h (e, f)(a, c, e) <100>_Al direction (b, d, f) <112>_Al direction

Fig.7 Phenomenological corrosion diagram relating OCP evolution to corrosion mode

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