Effect of Calcium Content on the Microstructure and Degradation of Mg-Ca Binary Alloys Potentially Used as Orthopedic Biomaterials

Ana Iulia Blajan; Florin Miculescu; Ion Ciucă; Mihai Cosmin Cotruț; Augustin Semenescu; Iulian Antoniac

doi:10.4028/www.scientific.net/KEM.638.104

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 638Effect of Calcium Content on the Microstructure...

Effect of Calcium Content on the Microstructure and Degradation of Mg-Ca Binary Alloys Potentially Used as Orthopedic Biomaterials

Abstract:

The effect of calcium addition in modifying the microstructural aspects and corrosion behavior was investigated on two different biodegradable magnesium alloys type Mg-xCa binary alloys (x = 0.8, 1.8 wt. (%)). Systematic microstructure investigations was made using optical microscopy and scanning electron microscopy coupled with energy dispersive X-ray. Following these experimental investigations, in the microstructure of the investigated Mg-Ca alloys a notable refinement was observed occurred with increasing the calcium content. The evaluation of corrosion resistance was performed both using electrochemical measurements and hydrogen release in simulated body fluid (SBF), as proposed by Kokubo and his colleagues, maintaining the temperature at 37°C. The results showed a lower corrosion resistance when the calcium content was increased, due to the increased Mg₂Ca intermetallic phase in grain boundaries. Consequently, our preliminary results showed that MgCa0.8 alloy having a minimal amount of Mg₂Ca appear to be a promising alloy to be used as a biomaterial for orthopedic implants.

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Periodical:

Key Engineering Materials (Volume 638)

Pages:

104-108

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.638.104

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Online since:

March 2015

Authors:

Ana Iulia Blajan, Florin Miculescu, Ion Ciucă, Mihai Cosmin Cotruț, Augustin Semenescu, Iulian Antoniac*

Keywords:

Corrosion, Hydrogen Release, Magnesium Alloys, Orthopedic, SEM

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