Abstract
The initial stages of corrosion of AZ31B magnesium alloy, immersed in Ringer’s solution at 37 °C body temperature for four days, have been evaluated by independent gravimetric and chemical methods and through electrochemical impedance spectroscopy (EIS) measurements. The corrosion current densities estimated by hydrogen evolution are in good agreement with the time-integrated reciprocal charge transfer resistance values estimated by EIS. The change in the inductive behavior has been correlated with difference in the chemical composition of corrosion layers. At the shorter immersion of 2 days, EDS analysis of cross section of the uniform corrosion layer detected Cl and Al elements, perhaps as formed aluminum oxychlorides salts.
Highlights
Magnesium (Mg) alloys are being suggested as biodegradable implant materials for clinical applications [1,2,3,4,5], because Mg is non-toxic, biocompatible and beneficial for bone growth and metabolic processes in the human body [6,7,8,9]
The aim of this study is to follow the evolution of AZ31B magnesium alloy surface activity during the initial stages of corrosion in Ringer’s solution, maintained at a body temperature of 37 ◦ C
The cross covered the AZ31B alloy surface (Figure 1a)
Summary
Magnesium (Mg) alloys are being suggested as biodegradable implant materials for clinical applications [1,2,3,4,5], because Mg is non-toxic, biocompatible and beneficial for bone growth and metabolic processes in the human body [6,7,8,9]. As a consequence, these alloys are widely used as materials for biomedical applications [10,11,12,13,14]. As test media in this work was selected Ringer’s solution, which is an isotonic (physiological) aqueous solution of NaCl with additional compounds, as found in human body fluids (blood serum)
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