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Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids

AuthorsAlvarez-López, M.; Pereda, M. D.; Valle, Jorge del; Fernández-Lorenzo, M.; García-Alonso, M. C.; Ruano, Oscar Antonio; Escudero Rincón, María Lorenza
KeywordsAZ31 Mg alloy
Grain size
Electrochemical techniques
Issue Date2010
CitationActa Biomaterialia 6 (5) : 1763-1771 (2010)
AbstractThe corrosion behaviour of AZ31 magnesium alloy with different grain sizes immersed in simulated body fluids was compared in chloride solution (8 g l−1) and in phosphate-buffer solution (PBS). The influence of immersion time was also analyzed. Electrochemical techniques such as open circuit potential, polarization curves, transient currents and electrochemical impedance spectroscopy, complemented with scanning electron microscopy and energy dispersive spectroscopy, were used. Immediately after the immersion in the corrosive media the corrosion resistance was similar for both grain sizes of the AZ31 alloy and higher in NaCl solutions than in PBS. However, this corrosion behaviour was reversed after longer periods of immersion due to the stabilizing of the corrosion products of MgO by P-containing compounds. These P-compounds contribute to a higher level of protection by hindering the aggressive action of chloride ions. The best corrosion behaviour of the AZ31 alloy was obtained for the finest grain alloy associated with the highest transfer resistance value, after long periods of immersion in PBS.
Publisher version (URL)http://dx.doi.org/10.1016/j.actbio.2009.04.041
Appears in Collections:(CENIM) Artículos
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