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. 2021 Nov 6;12(11):1368.
doi: 10.3390/mi12111368.

Laser-Sintered Mg-Zn Supersaturated Solid Solution with High Corrosion Resistance

Youwen Yang  1 , Wei Wang  1 , Mingli Yang  1 , Yingxin Yang  1 , Dongsheng Wang  2 , Zhigang Liu  3 , Cijun Shuai  1   4   5
Affiliations

Laser-Sintered Mg-Zn Supersaturated Solid Solution with High Corrosion Resistance

Youwen Yang et al. Micromachines (Basel). .

Abstract

Solid solutions of Zn as an alloy element in Mg matrixes are expected to show improved corrosion resistance due to the electrode potential being positively shifted. In this study, a supersaturated solid solution of Mg-Zn alloy was achieved using mechanical alloying (MA) combined with laser sintering. In detail, supersaturated solid solution Mg-Zn powders were firstly prepared using MA, as it was able to break through the limit of phase diagram under the action of forced mechanical impact. Then, the alloyed Mg-Zn powders were shaped into parts using laser sintering, during which the limited liquid phase and short cooling time maintained the supersaturated solid solution. The Mg-Zn alloy derived from the as-milled powders for 30 h presented enhanced corrosion potential and consequently a reduced corrosion rate of 0.54 mm/year. Cell toxicity tests confirmed that the Mg-Zn solid solution possessed good cytocompatibility for potential clinical applications. This study offers a new strategy for fabricating Mg-Zn solid solutions using laser sintering with MA.

Keywords: Mg-Zn solid solution; corrosion resistance; laser sintering; mechanical alloying.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic map showing the preparation process for laser-sintered Mg-Zn parts.
Figure 2
Figure 2
SEM morphologies of (a) initial mixed powders and (b–e) mixed powders after milling for 10, 20, 30, and 40 h, respectively.
Figure 3
Figure 3
SEM image showing the cross-sections of Mg-Zn powders after milling for (a) 10 h, (b) 20 h, and (c) 30 h. (d) XRD patterns of as-milled powders.
Figure 5
Figure 5
(a) Laser-sintered parts and corresponding surfaces after polishing. (b) XRD patterns of laser-sintered samples.
Figure 6
Figure 6
(a) Potentiodynamic polarization curves. (b) Nyquist diagrams. (c) Bode impedance plots. (d) Bode phase angle curves.
Figure 7
Figure 7
(a) Corrosion rates, (b) pH values, and (c) Mg2+ and (d) Zn2+ ion concentrations for all sample extracts.
Figure 8
Figure 8
Surface morphologies of laser-sintered parts: (a) before and (b) after removing corrosion products.
Figure 9
Figure 9
(a) Cell morphology and (b) cell viability results for MG-63 cells after 1, 3, and 5 d culture in M0 and M30 extracts.
Figure 4
Figure 4
TEM analysis of Mg-Zn powder after milling for 30 h: (a) bright-field TEM image; (b) SAED pattern; (c) high-resolution image with FFT inset; (d) corresponding inverse FFT image.
See this image and copyright information in PMC

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