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Título:
Magnesium alloys as temporary implants: electrochemical study in Hanks solution
Autor/es:
SHEILA OMAR; JOSEFINA BALLARRE; CERE, SILVIA
Reunión:
Simposio; 10th International Symposium on Electrochemical impedance Spectroscopy; 2016
Resumen:
Magnesium and magnesium alloys present good biocompatibility and elasticity modulus close to bone, besides they can biodegrade in situ. This means that they present the potentiality to be used as temporary implants remaining in the body while the bone tissue heals without the need of further removal surgery. The main drawback that the Mg presents is that it has a high corrosion rate in body environment. Many attempts have been done in studying the pure Mg and Mg alloys in vitro in order to evaluate the corrosion rate in physiological fluids. It has been demonstrated that pH increase during corrosion testing in vitro, and so the corrosion rate can be underestimated.This work presents the electrochemical evaluation of AZ31 alloy in Hank ?s solution at room temperature and at 37 °C. Buffered Hank ?s solution with HEPES (N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid) and without buffer are compared. Classical electrochemical techniques (polarization curves, polarization resistance and electrochemical impedance spectroscopy, EIS) were used at various immersion times. The analysis was complemented with surface techniques as Raman spectroscopy to evaluate corrosion products on the surface are presented.