Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca

doi:10.11902/1005.4537.2022.084

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 428-434 DOI: 10.11902/1005.4537.2022.084

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Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca

ZHANG Quanfu¹, SONG Lei¹, WANG Jian¹, GUO Zhenyu², REN Naidong¹, ZHAO Jianqi¹, WU Weikang¹, CHENG Weili²(

)

^1.Xiaoyi Dongyi Magnesium Industry Co, Ltd., Xiaoyi 032308, China
^2.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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Abstract

Due to its rapid corrosion rate, the mechanical support function of Mg-alloy implants will be lost in a short time after implantation. Mg-Bi based alloys have attracted much attention in biomedical field because of their non-toxic, excellent biocompatibility and corrosion-resistance. However, the low strength restricts the wide application of Mg-Bi binary alloy. Therefore, the effect of Sn and Ca addition on the microstructure, mechanical properties and corrosion behavior of extruded Mg-0.5Bi-based alloy was investigated in the present article. The results indicated that the extruded Mg-0.5Bi-0.5Sn-0.5Ca (mass fraction,%) alloy consists mainly of phases α-Mg, Mg₂Bi₂Ca and Mg₂Sn, and the alloy presents a fully recrystallized microstructure and uniform grain size distribution. The alloy possesses ultimate tensile strength (UTS) of 191 MPa with elongation at break (EL) of 31.5%. In addition, its corrosion rate (P_i) is 0.51 mm/a and polarization resistance (R_p) is 707.19 Ω·cm². The hydrogen evolution rate initially increased and then decreased with increasing immersion time due to the formation of Sn and Ca-containing products. Finally, the hydrogen evolution rate reached 2.43 mL/d, which is related to the broken of corrosion product film.

Key words: Mg-Bi based alloy microstructure mechanical property strengthening mechanism corrosion behavior

Received: 24 March 2022 32134.14.1005.4537.2022.084

ZTFLH:

TG146

Fund: Shanxi Scholarship Council of China(2019032);Science and Technology Major Project of Shanxi Province(20191102008)

About author: CHENG Weili, E-mail: chengweili7@126.com

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	Quanfu ZHANG
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Cite this article:

ZHANG Quanfu, SONG Lei, WANG Jian, GUO Zhenyu, REN Naidong, ZHAO Jianqi, WU Weikang, CHENG Weili. Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 428-434.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.084 OR https://www.jcscp.org/EN/Y2023/V43/I2/428

Fig.1 Microstructures (a) and grain size distribution (b) of the extruded Mg-0.5Bi-0.5Sn-0.5Ca alloy

Fig.2 X-ray diffraction pattern (a), SEM micrographs (b, c) and pole figures (d, e) of the extruded Mg-0.5Bi-0.5Sn-0.5Ca alloy

Fig.3 Engineering stress-strain curve (a), work hardening rate curve (b) and fracture surfaces of the tensile samples (c, d) of the extruded Mg-0.5Bi-0.5Sn-0.5Ca alloy

Fig.4 Hydrogen volume evolution (a) and corrosion rates (b) for the extruded Mg-0.5Bi-0.5Sn-0.5Ca alloy measured in the SBF

Fig.5 Polarization curve (a), Nyquist diagram (b) and equivalent circuits of the EIS spectra (c) for the extruded Mg-0.5Bi-0.5Sn-0.5Ca alloy measured in the SBF

Fig.6 XPS analysis of the formed products on the studied alloy: (a) high-resolution Mg 1s spectrum; (b) high-resolution Ca 2p spectrum; (c) high-resolution Sn 3d spectrum; (d) high-resolution O 1s spectrum

Table 1 Comparison of the corrosion resistance for Mg-0.5Bi-0.5Sn-(0.5Ca) alloy

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