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Effects of zirconium and strontium on the biocorrosion of Mg-Zr-Sr alloys for biodegradable implant applications

Ding, Yunfei, Li, Yuncang, Lin, Jixing and Wen, Cuie 2015, Effects of zirconium and strontium on the biocorrosion of Mg-Zr-Sr alloys for biodegradable implant applications, Journal of materials chemistry B, vol. 3, no. 18, pp. 3714-3729, doi: 10.1039/c5tb00433k.

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Title Effects of zirconium and strontium on the biocorrosion of Mg-Zr-Sr alloys for biodegradable implant applications
Author(s) Ding, Yunfei
Li, Yuncang
Lin, Jixing
Wen, Cuie
Journal name Journal of materials chemistry B
Volume number 3
Issue number 18
Start page 3714
End page 3729
Total pages 16
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2015
ISSN 2050-7518
Summary The successful applications of magnesium (Mg) alloys as biodegradable orthopedic implants are mainly restricted due to their rapid degradation rate in the physiological environment, leading to a loss of mechanical integrity. This study systematically investigated the degradation behaviors of novel Mg-Zr-Sr alloys using electrochemical techniques, hydrogen evolution, and weight loss in simulated body fluid (SBF). The microstructure and degradation behaviors of the alloys were characterized using optical microscopy, XRD, SEM, and EDX. The results indicate that Zr and Sr concentrations in Mg alloys strongly affected the degradation rate of the alloys in SBF. A high concentration of 5 wt% Zr led to acceleration of anodic dissolution, which significantly decreased the biocorrosion resistance of the alloys and their biocompatibility. A high volume fraction of Mg17Sr2 phases due to the addition of excessive Sr (over 5 wt%) resulted in enhanced galvanic effects between the Mg matrix and Mg17Sr2 phases, which reduced the biocorrosion resistance. The average Sr release rate is approximately 0.15 mg L-1 day-1, which is much lower than the body burden and proves its good biocompatibility. A new biocorrosion model has been established to illustrate the degradation of alloys and the formation of degradation products on the surface of the alloys. It can be concluded that the optimal concentration of Zr and Sr is less than 2 wt% for as-cast Mg-Zr-Sr alloys used as biodegradable orthopedic implants.
Language eng
DOI 10.1039/c5tb00433k
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Royal Society of Chemistry
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Document type: Journal Article
Collection: Institute for Frontier Materials
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