Effect of High-temperature Oxidation Treatment on the Corrosion Resistance of Mg-Nd Alloys

XIA Shouxin; YUE Siyu; WANG Li; LONG Jiabao; WANG Qinghang

doi:10.3969/j.issn.1674-6457.2026.04.004

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (4) : 33-44. DOI: 10.3969/j.issn.1674-6457.2026.04.004

Light Alloy Forming

Effect of High-temperature Oxidation Treatment on the Corrosion Resistance of Mg-Nd Alloys

XIA Shouxin, YUE Siyu, WANG Li, LONG Jiabao, WANG Qinghang^*

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Abstract

The work aims to investigate the corrosion behavior and corrosion resistance of as-cast Mg-xNd alloys (x=1.1%, 5.5% and 9.9%) and high-temperature oxidized Mg-xNd alloys in a 3.5 wt.% NaCl solution. The corrosion resistance of alloy samples was compared and analyzed with hydrogen evolution method and electrochemical method. The phase composition of alloy samples was obtained by X-ray diffractometer. The microscopic morphology characteristics of alloy samples before and after corrosion were observed by scanning electron microscopy. The corrosion depth of alloy samples after removal of corrosion products was analyzed by laser confocal microscopy. Under both the as-cast condition and the high-temperature oxidation treatment conditions, the corrosion rate of alloy samples increased with the increasing content of Nd element. Especially in the high-Nd content as-cast alloy, the Mg₁₂Nd phase and the magnesium matrix suffered severe galvanic corrosion, significantly reducing the corrosion resistance of alloy samples. However, the sample surface after high-temperature oxidation formed a dense Nd₂O₃/MgO composite protective film, which further isolated the chloride ions from eroding the magnesium matrix and effectively improved the corrosion resistance of alloys. Among them, the corrosion resistance of the Mg-1.1% Nd alloy in the high-temperature oxidation state was the most outstanding. The corrosion resistance of alloy samples is the result of the combined effects of Nd element content, phase composition, heat treatment state and oxide film structure. Although the increase in Nd element content leads to an increase in the corrosion rate of alloys, through high-temperature oxidation treatment, a dense Nd₂O₃/MgO composite protective film can be formed with the Nd element, thereby partially counteracting its promoting effect on corrosion and achieving an improvement in corrosion resistance.

Key words

Mg-Nd alloy / high-temperature oxidation treatment / microstructure / oxide film / corrosion resistance

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XIA Shouxin, YUE Siyu, WANG Li, LONG Jiabao, WANG Qinghang. Effect of High-temperature Oxidation Treatment on the Corrosion Resistance of Mg-Nd Alloys[J]. Journal of Netshape Forming Engineering. 2026, 18(4): 33-44 https://doi.org/10.3969/j.issn.1674-6457.2026.04.004

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