Microstructure and Electrochemical Corrosion Properties of Biomedical Extruded Mg-Zn-Gd Alloys

doi:10.11902/1005.4537.2015.050

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (3): 267-272 DOI: 10.11902/1005.4537.2015.050

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Microstructure and Electrochemical Corrosion Properties of Biomedical Extruded Mg-Zn-Gd Alloys

Xiaowei FENG^1,²,Wenjun QI¹(

),Xiaohui LI¹,Zhicheng LI²

1. Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650, China
2. College of Materials Science and Engineering, Central South University, Changsha 410083,China

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Abstract

The microstructure and corrosion morphology of extruded alloys Mg-xZn-yGd (x=1~3, y=0~3) were observed by optical microscopy (OM), scanning electron microscopy (SEM). Results show that after extrusion the microstructure of the alloys is obviously refined and further refined by Gd addition, i.e. the average grain size decreases from (30±3) μm for Mg-3Zn to (10±2) μm for Mg-3Zn-3Gd. The dynamic recrystallization occurs during the extrusion, while the second phase particles tend to distribute as belts along the extrusion direction. Mg-xZn-yGd alloy is sensitive to pitting corrosion in the Hank's solution. Among others the corrosion of Mg-3Zn-2Gd is the fastest,while that of Mg-3Zn is the slowest. After solid solution treatment, the corrosion rate of Mg-3Zn-2Gd and Mg-3Zn-3Gd decreases from (0.605±0.025) and (0.352±0.021) mg/(cm²h) to (0.085±0.010) and (0.167±0.020) mg/(cm²h) respectively. With increasing Zn content the corrosion current density decreases and the high-frequency capacitance increases gradually; with the increase of Gd content, the corrosion current density and high-frequency capacitance of the alloys rise firstly and then reduce gradually. Mg-3Zn alloy exhibits aminimum corrosion current density (8.65×10^-3 mA/cm²)and a maximum Faraday resistance R_t (3312 Ω).

Key words: Mg-Zn-Gd alloy microstructure electrochemistry corrosion

Received: 10 April 2015

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Cite this article:

Xiaowei FENG,Wenjun QI,Xiaohui LI,Zhicheng LI. Microstructure and Electrochemical Corrosion Properties of Biomedical Extruded Mg-Zn-Gd Alloys. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 267-272.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.050 OR https://www.jcscp.org/EN/Y2016/V36/I3/267

Fig.1 OM graphs of extruded Mg-1Zn-1Gd (a), Mg-2Zn-1Gd (b), Mg-3Zn-1Gd (c), Mg-3Zn-2Gd (d), Mg-3Zn-3Gd (e) and Mg-3Zn (f) alloys

Fig.2 OM graphs of extruded Mg-3Zn-2Gd (a) and Mg-3Zn-3Gd (b) alloys after solution treatment (T4)

Fig.3 XRD spectra of extruded Mg-3Zn and Mg-3Zn-2Gd alloys

Fig.4 Corrsion rate curves of Mg-xZn-yGd alloys during immersion in Hank's solution

Fig.5 Corrsion rates of Mg-3Zn-yGd (y=2,3) alloys with T4 and T6 heat treatments during immersion in Hank's solution for 72 h

Fig.6 XRD spectra of corrosion products of Mg-3Zn-2Gd alloy after immersion in Hank's solution for 3 d

Fig.7 SEM images of Mg-3Zn (a), Mg-3Zn-1Gd (b) and Mg-3Zn-2Gd (c) alloys after immersion in Hank's solution for 3 d and then acid cleaning

Fig.8 Potentiodynamic polarization curves (a) and electrochemical impedance spectroscopies (b) of Mg-xZn-yGd alloys during corrosion in Hank's solution and equivalent circuit (c) for EIS

Table 1 Fitting results of polarization curves ofMg-xZn-yGd alloys

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