Corrosion Behavior of Mg-Gd-Y-Zn-Zr Alloy in NaCl and Na2SO4 Solutions

doi:10.11902/1005.4537.2024.390

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (5): 1289-1299 DOI: 10.11902/1005.4537.2024.390

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Corrosion Behavior of Mg-Gd-Y-Zn-Zr Alloy in NaCl and Na₂SO₄ Solutions

CAI Ketao¹^,², JI Lei³, ZHANG Zhen³(

), FENG Qiang¹^,², DENG Weilin¹^,², LAN Guihong⁴, HE Sha¹^,², ZHAO Zhanyong³, BAI Peikang³

1 Sichuan Kete Testing Technology Co., Ltd., Guanghan 618300, China
2 Safety and Environmental Quality Supervision and Testing Institute of Chuanqing Drilling Engineering Co., Ltd., Guanghan 618300, China
3 School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
4 School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China

Cite this article:

CAI Ketao, JI Lei, ZHANG Zhen, FENG Qiang, DENG Weilin, LAN Guihong, HE Sha, ZHAO Zhanyong, BAI Peikang. Corrosion Behavior of Mg-Gd-Y-Zn-Zr Alloy in NaCl and Na₂SO₄ Solutions. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1289-1299.

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Abstract

The corrosion behavior of Mg-Gd-Y-Zn-Zr alloy in NaCl and Na₂SO₄ solutions was studied using hydrogen evolution measurement, mass loss measurement, cathodic polarization curve, electrochemical impedance spectroscopy and corrosion morphology observation. The results indicated that the corrosion rate of Mg-Gd-Y-Zn-Zr alloy in 0.6 mol/L NaCl solution was much higher than that in 0.6 mol/L Na₂SO₄ solution. A scale of needle-like oxides rapidly formed on the surface of Mg-Gd-Y-Zn-Zr alloy in NaCl solution. As immersion progressed, the oxide scale thickened and a large number of micro-cracks appeared. In the initial stage of Mg-Gd-Y-Zn-Zr alloy soaking in Na₂SO₄ solution, the oxide scale was relatively thin. With the increasing soaking time, the oxide scale exhibited a flocculent characteristic, and significant sulfur enrichment was observed in the corrosion products scale. The corrosion morphology observation showed that the α-Mg matrix of Mg-Gd-Y-Zn-Zr alloy was preferentially dissolved in NaCl solution with deeper and localized corrosion characteristics. In Na₂SO₄ solution, the second phase preferentially corroded with shallower and relatively uniform corrosion. Based on the above results, the influence mechanism of Cl^- and SO $4 2 -$ on corrosion behavior of Mg-Gd-Y-Zn-Zr alloy was discussed from the aspects of oxide scale formation and galvanic corrosion.

Key words: rare-earth Mg alloy corrosion behavior second phase oxide scale galvanic corrosion

Received: 02 December 2024 32134.14.1005.4537.2024.390

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52105409);Fundamental Research Program of Shanxi Province(20210302124042)

Corresponding Authors: ZHANG Zhen, E-mail: zzhang14s@alum.imr.ac.cn

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	Articles by authors
	CAI Ketao
	JI Lei
	ZHANG Zhen
	FENG Qiang
	DENG Weilin
	LAN Guihong
	HE Sha
	ZHAO Zhanyong
	BAI Peikang

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.390 OR https://www.jcscp.org/EN/Y2025/V45/I5/1289

Fig.1 SEM image (a) and magnified image (b) of the surface of cast Mg-10Gd-4Y-2Zn-0.5Zr alloy, and EDS elemental mapping results (c)

Table 1 Compositions of the marked points1, 2 and 3 in Fig.1

Fig.2 Hydrogen evolution amounts (a), hydrogen evolution rates (b) and average corrosion rates (c) of Mg-10Gd-4Y-2Zn-0.5Zr alloy during immersion in 0.6 mol/L NaCl solution and 0.6 mol/L Na₂SO₄ solution

Fig.3 Cathodic polarization curves of Mg-10Gd-4Y-2Zn-0.5Zr alloy after immersion for 1-24 h in 0.6 mol/L NaCl solution (a) and 0.6 mol/L Na₂SO₄ solution (b)

Fig.4 Histograms of I_corr of Mg-10Gd-4Y-2Zn-0.5Zr alloy during immersion for different time in 0.6 mol/L NaCl solution and 0.6 mol/L Na₂SO₄ solution

Fig.5 Nyquist (a, d), Bode module (b, e) and Bode phase angle (c, f) plots of Mg-10Gd-4Y-2Zn-0.5Zr alloy immersed for different time in 0.6 mol/L NaCl solution (a-c) and 0.6 mol/L Na₂SO₄ solution (d-f)

Fig.6 Equivalent circuit diagrams for EIS of Mg-10Gd-4Y-2Zn-0.5Zr alloy during immersion in 0.6 mol/L NaCl solution (a) and 0.6 mol/L Na₂SO₄ solution (b)

Fig.7 R_p vs. time curves for Mg-10Gd-4Y-2Zn-0.5Zr alloy during immersion in two solutions

Fig.8 Surface morphologies of Mg-10Gd-4Y-2Zn-0.5Zr alloy immersed in 0.6 mol/L NaCl solution (a-d) and 0.6 mol/L Na₂SO₄ solution (e-h) for 1 h (a, e), 3 h (b, f), 6 h (c, g) and 24 h (d, h)

Fig.9 Cross-sectional morphologies of Mg-10Gd-4Y-2Zn-0.5Zr alloy immersed in 0.6 mol/L NaCl solution (a, b, e) and 0.6 mol/L Na₂SO₄ solution (c, d, f) for 24 h (a, c), and corresponding EDS element mappings (b, d, e, f)

Fig.10 SEM surface morphologies of Mg-10Gd-4Y-2Zn-0.5Zr alloy immersed in 0.6 mol/L NaCl solution (a-d) and 0.6 mol/L Na₂SO₄ solution (e-h) for 1 h (a, e), 6 h (b, f), 12 h (c, g) and 24 h (d, h), and EDS element mappings of the samples immersed for 24 h (i, j)

Fig.11 Cross-sectional morphologies of Mg-10Gd-4Y-2Zn-0.5Zr alloy after immersion in 0.6 mol/L NaCl solution (a, b) and 0.6 mol/L Na₂SO₄ solution (c, d) for 24 h

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