Corrosion Behavior of Mg-Gd-Y-Zr Alloy in Simulated Coastal Storage Environment

doi:10.11902/1005.4537.2024.206

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (3): 731-738 DOI: 10.11902/1005.4537.2024.206

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Corrosion Behavior of Mg-Gd-Y-Zr Alloy in Simulated Coastal Storage Environment

ZHANG Chao¹, CHEN Junhang², ZOU Shiwen¹, ZHANG Huan¹, LI Zhaoliang¹, XIAO Kui²(

)

^1.Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
^2.Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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ZHANG Chao, CHEN Junhang, ZOU Shiwen, ZHANG Huan, LI Zhaoliang, XIAO Kui. Corrosion Behavior of Mg-Gd-Y-Zr Alloy in Simulated Coastal Storage Environment. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 731-738.

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Abstract

In order to evaluate the corrosion behavior evolution of aerospace cast Mg-Gd-Y-Zr alloy in coastal storage environments, herein, an accelerated environmental spectrum test method was designed to simulate coastal storage environments based on environmental parameters of several typical southern coastal cities of our country. The corrosion behavior of Mg-Gd-Y-Zr alloy in the simulated coastal storage environment was studied by means of corrosion kinetics, scanning electron microscopy, X-ray diffraction analysis, and electrochemical testing. The results showed that with the progress of corrosion process, corrosion products formed on Mg-Gd-Y-Zr alloy increased gradually, and the resistance R_f of the rust layer continued to increase, while the alloy showed continually a decreasing trend in corrosion rate. The XRD results indicate that the corrosion products are composited mainly of Mg(OH)₂, MgCl₂·6H₂O, MgO, Gd₂O₃, and a small amount of ZrO₂. Correspondingly, the scale of corrosion products on the alloy was gradually divided into two layers, with the outer layer being relatively loose and the inner layer being relatively dense.

Key words: casting Mg-alloy storage environment corrosion product

Received: 09 July 2024 32134.14.1005.4537.2024.206

ZTFLH:

TG172

Corresponding Authors: XIAO Kui, E-mail: xiaokui@ustb.edu.cn

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	ZHANG Chao
	CHEN Junhang
	ZOU Shiwen
	ZHANG Huan
	LI Zhaoliang
	XIAO Kui

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.206 OR https://www.jcscp.org/EN/Y2025/V45/I3/731

Fig.1 Accelerated test method for simulating coastal storage environment

Fig.2 Microscopic morphology and phase composition of Mg-Gd-Y-Zr alloy: (a) metallographic structure morphology, (b) BSE morphology, (c) XRD pattern

Fig.3 Corrosion mass loss (a) and mass loss rate (b) curves of Mg-Gd-Y-Zr alloy after simulating coastal storage envir-onment experiment

Fig.4 Surface corrosion product morphologies of Mg-Gd-Y-Zr alloy after simulating coastal storage environment experiment for 284 h (a), 568 h (b), 852 h (c) and 1136 h (d)

Table 1 EDS spectra of surface corrosion products

Fig.5 Morphologies of rust layer on the cross-section of Mg-Gd-Y-Zr alloy after simulating coastal storage environment experiment for 284 h (a), 568 h (b), 852 h (c) and 1136 h (d)

Fig.6 XRD patterns of corrosion products after different cycles of simulating coastal storage environment experiment

Fig.7 Polarization curves (a) and fitting parameters (b) of Mg-Gd-Y-Zr alloy after simulating coastal storage environment experiment

Fig.8 Nyquist (a) and Bode modulus (b) plots of Mg-Gd-Y-Zr alloy after simulating coastal storage environment experiment

Table 2 Fitting parameters of electrochemical impedance spectroscopy

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