Effect of Retrogression Times on Microstructure and Corrosion Resistance of 2024 Aluminum Alloy

doi:10.11901/1005.3093.2021.450

Chinese Journal of Materials Research

2023, Vol. 37

Issue (4): 264-270 DOI: 10.11901/1005.3093.2021.450

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Effect of Retrogression Times on Microstructure and Corrosion Resistance of 2024 Aluminum Alloy

LIAO Hongyu, JIA Yongxin, SU Ruiming(

), LI Guanglong, QU Yingdong, LI Rongde

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Cite this article:

LIAO Hongyu, JIA Yongxin, SU Ruiming, LI Guanglong, QU Yingdong, LI Rongde. Effect of Retrogression Times on Microstructure and Corrosion Resistance of 2024 Aluminum Alloy. Chinese Journal of Materials Research, 2023, 37(4): 264-270.

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Abstract

Good corrosion resistance of 2024 Al-alloy without reducing mechanical properties can be obtained by retrogression and re-ageing (RRA) treatment. The effect of retrogression times of 0.1 h, 0.2 h, 0.3 h, 0.4 h and 0.5 h on the microstructure and corrosion resistance of 2024 Al-alloy treated by RRA were investigated by transmission electron microscopy, scanning electron microscopy, hardness tester, intergranular corrosion test and electrochemical corrosion test. The results show that the main precipitation strengthening phase of 2024 Al-alloy by RRA treatment is S phase. When the retrogression treatment time is 0.2 h, the S phase are small and uniformly distributed, and the properties of the alloy were also significantly improved. At this time, the hardness of the alloy is 147.2 HV_0.5, the intergranular corrosion depth is 98.5 μm, the free-corrosion potential is -0.64 V, the free-corrosion current density is 0.24 μA·cm^-2, and the resistance value is 31397 Ω·cm². Therefore, the appropriate retrogression time is beneficial to improve the hardness and corrosion resistance of 2024 aluminum alloy with RRA treatment.

Key words: metallic materials 2024 aluminum alloy retrogression and re-aging corrosion resistance precipitate

Received: 13 August 2021

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2017YFB1104000);Liaoning Natural Science Foundation(2021-MS-235)

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	LIAO Hongyu
	JIA Yongxin
	SU Ruiming
	LI Guanglong
	QU Yingdong
	LI Rongde

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.450 OR https://www.cjmr.org/EN/Y2023/V37/I4/264

Table 1 Composition of 2024 aluminum alloy (%, mass fraction)

Table 2 Heat treatments of different sample

Fig.1 Hardness of the alloy with different heat treatments

Fig.2 IGC morphologies of the alloy with different heat treatments (a) P; (b) RRA1; (c) RRA2; (d) RRA3; (e) RRA4 and (f)RRA5

Table 3 IGC depth of the alloy with different heat treatments

Fig.3 Polarization curves of the alloy with different heat treatments

Table 4 The polarization curves parameters of the alloy with different heat treatments

Fig.4 Nyquist diagram of the alloy with different heat treatments

Fig.5 Equivalent circuit

Table 5 EIS parameters of the alloy with different heat treatments

Fig.6 Light field TEM of the alloy with different heat treatments (a) P; (b) RRA1; (c) RRA2; (d) RRA3; (e) RRA4 and (f)RRA5

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