Effect of Zr Addition on Microstructure and Corrosion Behavior of Mg-3Zn-1Y Alloys

doi:10.11902/1005.4537.2020.033

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (2): 219-225 DOI: 10.11902/1005.4537.2020.033

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Effect of Zr Addition on Microstructure and Corrosion Behavior of Mg-3Zn-1Y Alloys

HUANG Tao¹^,², XU Chunxiang¹(

), YANG Lijing², LI Fuxia¹^,², JIA Qinggong¹, KUAN Jun¹, ZHANG Zhengwei¹, WU Xiaofeng¹, WANG Zhongqi¹^,²

^1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030000, China
^2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315000, China

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Abstract

Mg-3Zn-1Y-xZr (x=0, 0.2, 0.4, 0.6) alloys are prepared by traditional gravity casting. The influence of Zr amount on the microstructure and corrosion behavior of Mg-3Zn-1Y alloys is systematically investigated via optical microscope (OM), scanning electron microscope (SEM), mass loss testing and electrochemical testing. Results show that the Mg-3Zn-1Y alloy is mainly composed of α-Mg matrix and Mg₃YZn₆ (I) phase. The addition of Zr does not change the type of the second phase, while can remarkably refine the grains by increasing nucleation rate, optimize the structure and improve the corrosion resistance of Mg-3Zn-1Y alloys. Meanwhile, the addition of Zr can increase the corrosion potential of alloy substrate, reduce the corrosion current density, thereby decreasing the tendency of corrosion and inhibiting the corrosion. The mass loss results indicate that the Mg-3Zn-1Y-0.6Zr alloy has the best corrosion resistance with corrosion rate of (0.325±0.042) mm/a.

Key words: Zr microstructure corrosion behavior grain refinement mass loss

Received: 05 March 2020

ZTFLH:

TG27

Fund: National Natural Science Foundation of China(51574175);Ningbo Science and;Technology Innovation 2025 Major Project(2019B10104)

Corresponding Authors: XU Chunxiang E-mail: xuchunxiang2020@126.com

About author: XU Chunxiang, E-mail: xuchunxiang2020@126.com

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	Tao HUANG
	Chunxiang XU
	Lijing YANG
	Fuxia LI
	Qinggong JIA
	Jun KUAN
	Zhengwei ZHANG
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	Zhongqi WANG

Cite this article:

HUANG Tao, XU Chunxiang, YANG Lijing, LI Fuxia, JIA Qinggong, KUAN Jun, ZHANG Zhengwei, WU Xiaofeng, WANG Zhongqi. Effect of Zr Addition on Microstructure and Corrosion Behavior of Mg-3Zn-1Y Alloys. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 219-225.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.033 OR https://www.jcscp.org/EN/Y2021/V41/I2/219

Table 1 Chemical compositions of Mg-3Zn-1Y-xZr (x=0, 0.2, 0.4, 0.6) alloys (mass fraction / %)

Fig.1 XRD patterns of four investigated alloys

Fig.2 Metallographic structures of Mg-3Zn-1Y(a), Mg-3Zn-1Y-0.2Zr (b), Mg-3Zn-1Y-0.4Zr (c) and Mg-3Zn-1Y-0.6Zr (d) alloys

Table 2 GRF values and related parameters of various elements in magnesium^[10]

Fig.3 Corrosion rates of four investigated alloys in the Hank's solution

Fig.4 Values of electrolyte pH as a function of immersion time

Fig.5 Corrosion morphologies of Mg-3Zn-1Y(a), Mg-3Zn-1Y-0.2Zr (b), Mg-3Zn-1Y-0.4Zr (c) and Mg-3Zn-1Y-0.6Zr (d) alloys after immersion in the Hank's solution for 240 h

Fig.6 Open circuit potential of four investigated alloys

Fig.7 Potentiodynamic polarization curves of four investigated alloys

Table 3 Fitting results of potentiodynamic polarization curve

Fig.8 Corrosion morphology of Mg-3Zn-1Y-0.6Zr alloy after immersion in the Hank's solution for 45 min

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