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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
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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)
Corresponding Authors:  Chao CAI     E-mail:  caijingchao@126.com

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.

URL: 

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)
Time / hDominating corrosion modeMax. IGC depth / μmMax. pitting depth / μm
0Pitting-120
2Local IGC140-
4General IGC238-
6General IGC221-
11.5Local IGC with pitting179101
22Local IGC with pitting134135
36Pitting with local IGC101192
45Pitting with local IGC72163
58Pitting with local IGC82151
68Pitting with slight IGC-199
72Pitting with slight IGC-227
98Pitting with slight IGC-167
120Pitting with slight IGC-181
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)
Time / hDominating corrosion modeMax. IGC depth / μmMax. pitting depth / μm
0Pitting-125
1Pitting and local IGC60122
2Pitting and local IGC90120
4Pitting with local IGC115125
10Pitting-98
22Pitting-107
28Pitting-100
36Pitting-107
48Pitting-127
60Pitting-110
72Pitting-140
120Pitting-100
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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