Microstructure Evolution and Corrosion Behavior of Degradable Zn-7Mg Alloy After Heat Treatment

doi:10.11902/1005.4537.2016.046

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 347-353 DOI: 10.11902/1005.4537.2016.046

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Microstructure Evolution and Corrosion Behavior of Degradable Zn-7Mg Alloy After Heat Treatment

Zhenguo NIU^1,², Pushan GUO¹, Hong YE², Lijing YANG¹(

), Cheng XU¹, Zhenlun SONG¹

1 Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China

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Abstract

Microstructure evolution and corrosion behavior of a degradable Zn-7Mg alloy after heat treatment was investigated by means of inductively coupled plasma emission spectrometer (ICP) and energy dispersive spectrometer (EDS), optical microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD) as well as electrochemical test in phosphate buffered saline (PBS). Results indicated that, the microstructure of the as-cast Zn-7Mg alloy was mainly composed of α-Zn and MgZn₂, while the peritectic reaction occurred rapidly during heat treatment. After heat treatment the Zn-7Mg alloy was composed of stable phase Mg₂Zn₁₁ and a little of residual MgZn₂. The phase Mg₂Zn₁₁ showed lower corrosion resistance in PBS solution than the pure zinc, therefore, the phase Mg₂Zn₁₁ should be avoided in actual production.

Key words: Zn alloy heat treatment microstructure corrosion

Received: 06 April 2016

ZTFLH:

TG146.1+3

Fund: Supported by National Natural Science Foundation of China (51301193), Public Welfare Project of Zhejiang Province (2015C31031) and Natural Science Foundation of Ningbo (2015A610070)

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These authors contributed equally to this work.

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	Zhenlun SONG

Cite this article:

Zhenguo NIU, Pushan GUO, Hong YE, Lijing YANG, Cheng XU, Zhenlun SONG. Microstructure Evolution and Corrosion Behavior of Degradable Zn-7Mg Alloy After Heat Treatment. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 347-353.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.046 OR https://www.jcscp.org/EN/Y2017/V37/I4/347

Fig.1 Optical micrograph of as-cast Zn-7Mg alloy

Fig.2 Mg-Zn phase diagram^[25]

Fig.3 SEM image of as-cast Zn-Mg alloy (a) and the magnified image of area I in Fig.3a (b)

Table 1 EDS analysis results of different zones in Fig.3 (mass fraction / %)

Fig.4 XRD patterns of as-cast Zn-7Mg alloy after heat-treatment for different time

Fig.5 Optical graphs of Zn-7Mg alloy after heat treatment for 1 h (a), 3 h (b), 5 h (c) and 8 h (d)

Fig.6 SEM images of Zn-7Mg alloy after heat treatment for 1 h (a), 3 h (b), 5 h (c) and 8 h (d)

Table 2 EDS analysis results of different zones in Fig.6a (mass fraction / %)

Fig.7 Open circuit potentials of pure zinc and Mg₂Zn₁₁ in PBS solution

Fig.8 EIS (a) and the corresponding circuit model (b) for EIS of pure zinc and Mg₂Zn₁₁ in PBS solution

Table 3 Fitting values of electrochemical parameters of EIS

Fig.9 Polarization curves of pure zinc and Mg₂Zn₁₁ in PBS solution

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