Influence of thermomechanical treatment and rare-earth element doping on the corrosion behavior of Mg-based alloys in NaCl solution

• N.I. Karakchieva, E.D. Khabibova, O.M. Bausheva, V.I. Sachkov and A.S. Knyazev

National Research Tomsk State University, 634050, Tomsk, Lenin Ave., 36, Russia

Abstract: This paper presents the results of a study on the corrosion resistance of Mg95 magnesium alloys doped with Ti–Al–Me (Ti:Al=49:49; Me=Sc, Y, Nd, Dy, Ho, Er, Zr, Hf, 2 at.%) and subjected to additional thermomechanical treatment. Thermomechanical treatment resulted in increased polarization resistance and a corresponding decrease in current density for the alloys: a 6.75-fold increase for Y, a 14.36-fold increase for Er, a 3.13-fold increase for Nd, and a 3.04-fold increase for Sc. The study also examined the effect of doping element composition on the corrosion resistance of Mg95 magnesium alloys in a 3 wt.% NaCl solution. Thermomechanical treatment of Mg95 alloys doped with Dy, Y, Er, Nd, and Sc leads to a substantial increase in corrosion resistance, evidenced by a significant reduction in corrosion current density: from 1.0908 to 0.1616 mA·cm^–2 for Y; from 2.1130 to 0.1471 mA·cm^–2 for Er; from 1.2337 to 0.3936 mA·cm^–2 for Nd; and from 2.3066 to 0.7587 mA·cm^–2 for Sc. For the Mg95 alloy with the Ti–Al–Ме (Ме=Ho, Zr) composition, thermomechanical treatment (TMT) reduces corrosion resistance. Specifically, the corrosion current density (jcorr) increased by 0.0325 mA·cm^–2 for Ho and by 0.7079 mA·cm^–2 for Zr. SEM images illustrating the surface morphology of the alloys, both before and after thermomechanical treatment, following corrosion tests in a 3 wt.% NaCl solution are provided.

Keywords: magnesium, alloying, rare-earth elements, thermomechanical treatment, corrosion, scanning electron microscopy, 3 wt.% NaCl solution, Mg95 alloys

Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 2410-2424
doi: 10.17675/2305-6894-2025-14-4-37

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