Microstructure and Corrosion Resistance of High-pressure Solidified Mg-xAl (x = 3, 5, 7, 9, 12) Alloys

doi:10.11902/1005.4537.2024.333

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (5): 1265-1276 DOI: 10.11902/1005.4537.2024.333

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Microstructure and Corrosion Resistance of High-pressure Solidified Mg-xAl (x = 3, 5, 7, 9, 12) Alloys

GUO Yaowei¹, AI Shimin¹, FANG Daran¹^,², LIN Xiaoping¹^,²(

), YANG Lianwei¹^,², ZHENG Zhehao¹

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China

Cite this article:

GUO Yaowei, AI Shimin, FANG Daran, LIN Xiaoping, YANG Lianwei, ZHENG Zhehao. Microstructure and Corrosion Resistance of High-pressure Solidified Mg-xAl (x = 3, 5, 7, 9, 12) Alloys. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1265-1276.

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Abstract

Mg-xAl (x = 3, 5, 7, 9, 12, mass fraction, %) alloys were prepared using both atmospheric pressure solidification and high-pressure solidification methods. The microstructure and corrosion resistance of the alloys were investigated using electrochemical tests, SEM and XPS. The results indicated that, after high pressure solidification at 4 GPa, the desolvation transition was inhibited for the alloy, and the eutectic composition point and maximum solubility point shifted to the right. Compared to atmospheric pressure solidification, the maximum matrix solid solubility of the high-pressure solidified Mg-Al alloys increased by 0.38%-3.43%, while the content of the eutectic β-Mg₁₇Al₁₂ phase decreased by 0.1%-14.9%. Furthermore, high pressure solidification could effectively improve the morphology and distribution of β-Mg₁₇Al₁₂. As a result, the propensity for galvanic coupling corrosion in the high-pressure solidified alloys decreased, and their corrosion resistance was significantly enhanced. Among the high-pressure solidified alloys with different Al contents, the Mg-5Al and Mg-9Al alloys exhibited the best corrosion resistance, which may be attributed to the better protective effect of their surface corrosion products on the substrate.

Key words: Mg-Al alloys high pressure solidification organization corrosion resistance

Received: 10 October 2024 32134.14.1005.4537.2024.333

ZTFLH:

T146.2

Fund: National Natural Science Foundation of China(51675092);Natural Science Foundation of Hebei Province(E2022501001);Natural Science Foundation of Hebei Province(E2022501006)

Corresponding Authors: LIN Xiaoping, E-mail: lxping3588@163.com

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	GUO Yaowei
	AI Shimin
	FANG Daran
	LIN Xiaoping
	YANG Lianwei
	ZHENG Zhehao

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.333 OR https://www.jcscp.org/EN/Y2025/V45/I5/1265

Table 1 Compositions of Mg-xAl (x = 3, 5, 7, 9, 12, mass fraction, %) alloys

Fig.1 Schematic diagram of the CS-1V type six-sided top pressure machine (a) and assembly of the high-pressure solidification sample (b): 1-top hammer, 2-thermocouple, 3-talc, 4-conductive block, 5-graphite, 6-boron nitride, 7-sample

Fig.2 Effect of Al content (mass fraction ) on the microstructure of conventional cast Mg-Al alloys: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d, e) Mg-9Al, (f) Mg-12Al

Fig.3 Effects of Al content on the amount of β-Mg₁₇Al₁₂ phase in Mg-Al alloys (a) and the solubility of Al in the matrix (b)

Fig.4 Effect of Al content (mass fraction ) on the microstructure of high-pressure solidified Mg-Al alloys: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d, e) Mg-9Al, (f) Mg-12Al

Fig.5 Effect of high-pressure solidification on the hydrogen evolution rate of Mg-xAl (x = 3, 5, 7, 9, 12) alloys

Fig.6 Polarization curves of conventional cast (a) and high-pressure solidified (b) Mg-xAl (x = 3, 5, 7, 9, 12) alloys, variations of corrosion potential (E_corr) and corrosion current density (I_corr) with Al content (c)

Fig.7 Nyquist plots of conventional cast Mg-3Al, Mg-5Al and Mg-7Al alloys (a), Mg-9Al and Mg-12Al alloys (b), and high-pressure (4 GPa) solidified Mg-xAl (x = 3, 5, 7, 9, 12) alloys (c)

Fig.8 Bode plots of conventional cast (a, c) and high-pressure solidified (b, d) Mg-xAl (x = 3, 5, 7, 9, 12) alloys: (a, b) frequency vs. phase angle curves, (c, d) frequency vs. impedance value curves

Fig.9 Polarization resistance (R_p) values of high-pressure solidified Mg-xAl (x = 3, 5, 7, 9, 12) alloys under different solidification pressures

Fig.10 Macroscopic corrosion morphologies of conventional cast Mg-xAl alloys: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d) Mg-9Al, (e) Mg-12Al

Fig.11 Macroscopic corrosion morphologies of high-pressure solidified Mg-xAl alloys: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d) Mg-9Al, (e) Mg-12Al

Fig.12 SEM corrosion morphologies of conventional cast Mg-xAl alloys: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d) Mg-9Al, (e) Mg-12Al

Fig.13 SEM corrosion morphologies of high-pressure solidified Mg-xAl alloys after immersion in 3.5%NaCl solution for 2 h: (a) Mg-3Al, (b) Mg-5Al, (c) Mg-7Al, (d) Mg-9Al, (e, f) Mg-12Al

Fig.14 Surface and cross-sectional SEM morphologies, and EDS element mappings of conventional cast alloys Mg-3Al (a-c), Mg-5Al (d-f) and Mg-9Al (g-i), and high-pressure solidified alloys Mg-3Al (j-l), Mg-5Al (m-o) and Mg-9Al (p-r)

Fig.15 XPS spectra of conventional cast Mg-5Al (a1-a3) and high-pressure solidified Mg-5Al (b1-b3) and Mg-9Al (c1-c3) alloys soaked in 3.5%NaCl solution for 24 h

Table 2 Surface chemical compositions of high-pressure solidified Mg-xAl (x = 5, 9) alloys

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