Corrosion Resistance of Absorbable Mg-Ca Based Alloys in Physiological Environment by Daniel Jogaib Fernandes, Ana Caroline Crema de Almeida, Victor Brandao, Ariel Assayag, and Carlos Nelson Elias in Open Access Journal of Biomedical Engineering and Biosciences (OAJBEB) in Lupine Publishers
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.
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