Study of the Degradation Behaviour of Biomaterial Mg-4.0Zn-2.0Sr Alloy in SBF

Abstract:

In vitro degradation behaviour and biological properties of Mg-4.0Zn-2.0Sr alloy sheet had been studied. The results indicate that a novel biodegradable Mg-4.0Zn-2.0Sr (wt. %) alloy sheet was successfully produced using a series of metallurgical processes. The corrosion of Mg-4.0Zn-2.0Sr (wt. %) alloy sheet immersed in SBF occurred as a cyclic process: pitting corrosion →extending of pitting corrosion along grain boundary→ localized corrosion → pitting corrosion again at the new exposed surfaces and the corrosion products were found that contain HA, CaCO₃ and MgOH. The change of corrosion rate of Mg-4.0Zn-2.0Sr alloy sheets immersed in SBF is unstable until the 17th day and the average corrosion rate of the alloy sheets was 1.244 g/(m² • h) after 17 days immersing, which is slightly higher than that of Mg-4.0Zn-1.0Sr alloy sheet 1.163 g/(m² • h). The corrosion resistance property in SBF of Mg-4.0Zn-2.0Sr alloy is slightly lower than that of Mg-4.0Zn-1.0Sr alloy, which is proved by electrochemical measurements.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 309-313
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.309
• Online since: March 2015
• Authors: Tong Cui*, Ren Guo Guan, Hai Ming Qin, Fu Lin Song
• Keywords: Biomaterial, Corrosion Rate, Degradation Behaviour, Mg-Zn-Sr Alloy

References

[1] Witte F, Fischer J, Nellesen J, et al. Acta Biomater, Vol. 6(5) (2010), pp.1792-1799.

[2] Gu X N, Zheng Y F, Cheng Y, et al. Biomaterials, Vol. 30(4) (2009), pp.484-498.

[3] Brar H S, Platt M O, Sarntinoranont M, et al. JOM, Vol. 61(9) (2009), pp.31-34.

[4] Yun Y, Dong Z Y, Lee N, et al. Materials Today, Vol. 12(10) (2009), pp.22-32.