Corrosion Resistance of Absorbable Mg-Ca Based Alloys in Physiological Environment

Daniel Jogaib Fernandes*, Ana Caroline Crema de Almeida, Victor Brandão, Ariel Assayag and Carlos Nelson Elias

Received: February 26, 2018;   Published: March 07, 2018

DOI: 10.32474/OAJBEB.2018.01.000116

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Abstract

The objective of this work was to investigate the electrochemical behavior of Mg40Ca and Mg-Ca-Gd alloys for biomedical application as implantable absorbable devices. Electrochemical tests were performed under a physiological electrolyte of 0.9% NaCl, pH=7.4, 37°C, at a rate of 1, 0.1 and 0.01 V/s. Polarization curves showed similar mechanism of electrochemical behavior between alloys. The ternary Mg-Ca-Gd alloy showed lower values of current density and corrosion potential than Mg40Ca alloy. The Mg40Ca based binary alloy showed higher values of corrosion susceptibility and lower polarization resistance than Mg-Ca-Gd alloy. Corrosion resistance improvements were achieved in ternary Mg based alloy with Gd and Ca content. The alloy with Gd and Ca content seemed adequate electrochemical resistance to attend biomedical demand.

Keywords: Magnesium alloy; Biodegradable metals; Rare earth elements; Corrosion; Biocompatibility

Abstract| Introduction| Material and Methods| Results| Discussion| Conclusion| Acknowledgement| References|