Microstructure and Corrosion Resistance of Medical Degradable Mg-2Y-1Zn-xZr Alloy

doi:10.11902/1005.4537.2021.014

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 113-119 DOI: 10.11902/1005.4537.2021.014

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Microstructure and Corrosion Resistance of Medical Degradable Mg-2Y-1Zn-xZr Alloy

WANG Zhongqi¹^,², XU Chunxiang¹(

), YANG Lijing²(

), TIAN Linhai¹, HUANG Tao¹^,², SHI Yixuan², YANG Wenfu¹

^1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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Abstract

The effect of Zr addition of 0%, 0.2%, 0.4% and 0.6% (mass fraction) respectively on the microstructure and corrosion behavior in simulated body fluid of Mg-2Y-1Zn alloys is systematically investigated via XRD, OM, SEM and EDS, as well as hydrogen evolution measurement and electrochemical measurement. The results show that Mg-2Y-1Zn is mainly composed of α-Mg and Mg₃Y₂Zn₃ phases, and the addition of Zr (≤0.4%) does not change the type of the second phase, while Zr can effectively refine the grains, optimize the microstructure, slower the corrosion current density, improve the corrosion resistance of the alloy, and make the alloy tend to uniform corrosion. However, when the addition of Zr is 0.6%, the excess Zr will precipitate to form a Zr rich region, which promotes the occurrence of galvanic corrosion and reduces the corrosion resistance of the alloy. The results of hydrogen evolution measurement show that the Mg-2Y-1Zn-0.4Zr alloy has the best corrosion resistance.

Key words: Zr grain refining metallographic structure electrochemistry corrosion Mg-alloy

Received: 18 January 2021

ZTFLH:

TG27

Fund: National Natural Science Foundation of China(51574175);National Key Research and Development Project(2019YFE0118600);Ningbo Science and Technology Innovation 2025 Major Project(2019B10104);Natural Science Foundation of Ningbo(2018A610211)

Corresponding Authors: XU Chunxiang,YANG Lijing E-mail: xuchunxiang2020@126.com;yanglj@nimte.ac.cn

About author: YANG Lijing, E-mail: yanglj@nimte.ac.cn
XU Chunxiang, E-mail: xuchunxiang2020@126.com

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Cite this article:

WANG Zhongqi, XU Chunxiang, YANG Lijing, TIAN Linhai, HUANG Tao, SHI Yixuan, YANG Wenfu. Microstructure and Corrosion Resistance of Medical Degradable Mg-2Y-1Zn-xZr Alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 113-119.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.014 OR https://www.jcscp.org/EN/Y2022/V42/I1/113

Table 1 Compositions of Mg-2Y-1Zn-xZr alloys

Fig1 XRD patterns of Mg-2Y-1Zn-Zr alloys with the different contents of Zr

Fig.2 Metallographic structures of Mg-2Y-1Zn (a), Mg-2Y-0.2Zr (b), Mg-2Y-0.4Zr (c) and Mg-2Y-0.6Zr (d)

Fig.3 Metallographic structures of Mg-2Y-1Zn-0.4Zr (a) and Mg-2Y-1Zn-0.6Zr (b) and corresponding element mappings of Mg (a2, a2), Y (a3, b3), Zn (a4, b4) and Zr (a5, b5)

Table 2 EDS analysis of the points of A, B, C in Fig.3a (mass fraction / %)

Fig.4 Variations of H₂release (a), hydrogen evolution rate (b) and pH value (c) with immersion time

Fig.5 XRD patterns of Mg-2Y-1Zn-xZr alloys after soaking in SBF solution for 10 d

Fig.6 Surface morphologies of Mg-2Y-1Zn (a, e), Mg-2Y-1Zn-0.2Zr (b, f), Mg-2Y-1Zn-0.4Zr (c, g) and Mg-2Y-1Zn-0.6Zr (d, h) before (a~d) and after (g, h) film removal

Fig.7 Polarization curves of Mg-2Y-1Zn-xZr alloys in SBF solution

Table 3 Fitting results of polarization curves of Mg-2Y-1Zn-xZr alloys in SBF solution

Fig.8 Nyquist (a) and Bode (b, c) plots equivalent circuit of Mg-2Y-1Zn-xZr alloys in SBF solution

Table 4 Fitting results of each component in the fitting circuit

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