Corrosion Behavior of 2297 Al-Li Alloy under Tensile Load

doi:10.11902/1005.4537.2019.162

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 439-445 DOI: 10.11902/1005.4537.2019.162

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Corrosion Behavior of 2297 Al-Li Alloy under Tensile Load

YU Mei(

),WEI Xindi,FAN Shiyang,LIU Jianhua,LI Songmei,ZHONG Jinyan

School of Materials Science and Engineering, Beihang University, Beijing 100083, China

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Abstract

The effect of tensile load on pitting corrosion behavior of 2297 Al-Li alloy in 3.5% (mass fraction) NaCl solution was studied by short time immersion test and in-situ electrochemical test under different loading conditions within the range of 0%, 30%, 60%, 90% and 103% of the σ_0.2 of the alloy, while the microstructure of the initial and plastically deformed 2297 Al-Li alloy was characterized. After plastic deformation, AlCuMnFe intermetallic particles of 2297 Al-Li alloy become fine and uniformly dispersed, and dislocation walls are formed inside the grains due to dislocation accumulation. Pitting corrosion mainly occurs around the AlCuMnFe intermetallic particles, and crystal defects such as crystal plane slip and dislocation entanglement also become corrosion nucleation sites. The increase of the applied load within the range of 0%σ_0.2~103%σ_0.2 leads to negative shift of the corrosion potential, increase of the corrosion current density and the charge transfer resistance, which will become more obvious when the stress level reaches the plastic stress range.

Key words: Al-Li alloy corrosion stress load microstructure electrochemistry

Received: 20 September 2019

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51671013)

Corresponding Authors: Mei YU E-mail: yumei@buaa.edu.cn

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Cite this article:

YU Mei,WEI Xindi,FAN Shiyang,LIU Jianhua,LI Songmei,ZHONG Jinyan. Corrosion Behavior of 2297 Al-Li Alloy under Tensile Load. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 439-445.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.162 OR https://www.jcscp.org/EN/Y2019/V39/I5/439

Fig.1 L-T oriented plate sample used in tensile test

Fig.2 Schematic diagram of in-situ electrochemical measuring device under external stress (1- tensile tester chuck; 2-silicon carbide ceramic rod; 3-tensile specimen; 4-nylon screw; 5-Luggin capillary; 6-injection port; 7-platinum electrode; 8-outlet)

Fig.3 TEM images of 2297-T87 Al-Li alloy at the orientation of [110]_Al: (a, c, e) the original sample; (b, d, f) the sample deformed under 103%σ_0.2 plastic stress; (g) the EDS result of point 1 in Fig.3a

Fig.4 Metallographic micrographs of 2297-T87 Al-Li alloy after immersion for 2 h under different stress loads: (a) 0%σ_0.2， (b) 30%σ_0.2， (c) 60%σ_0.2， (d) 90%σ_0.2， (e) 103%σ_0.2

Fig.5 BSE-SEM micrographs of 2297-T87 Al-Li alloy after immersion for 2 h under different stress loads: (a) 0%σ_0.2, (b) 30%σ_0.2, (c) 60%σ_0.2, (d) 90%σ_0.2, (e) 103%σ_0.2, (f) image of point A in Fig.4e

Fig.6 EDS area scannings of various elements in Fig.5a

Fig.7 Dynamic potential polarization curves of 2297-T87 Al-Li alloy in 3.5%NaCl solution under different stress loads

Table 1 Electrochemical parameters of dynamic potential polarization curves

Fig.8 Nyquist (a) and Bode (b) plots of 2297-T87 Al-Li alloy after immersion in 3.5%NaCl solution for 1 h under different stress loads

Fig.9 Equivalent circuit diagram for fitting EIS

Table 2 Fitting values of various electrochemical parameters from EIS data of 2297-T87 Al-Li alloy after immersion in 3.5%NaCl solution for 1 h under different stress loads

Fig.10 Corrosion mechanisms of 2297-T87 Al-Li alloy in 3.5%NaCl solution under the conditions of no stress (a), elastic stress (b) and plastic stress (c)

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