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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

2015 m. Nr. 1

Corrosion resistance of Mg-Nb alloy films in Hank’s balanced salt solution
Asta GRIGUCEVIČIENĖ, Konstantinas LEINARTAS, Laurynas STAIŠIŪNAS, Povilas MIEČINSKAS, Vitalija JASULAITIENĖ, Jūratė VAIČIŪNIENĖ, Eimutis JUZELIŪNAS

Magnesium alloys are promising materials for in vivo applications due to superior mechanical properties, biodegradability and biocompatibility. Novel Mg-xNb systems with Nb content ranging between 4 and 44 at.% were formed by sputtering technique. Electrochemical and corrosion behaviour of the alloys was studied in Hank’s balanced salt solution employing the methods of inductively coupled plasma / optical emission analysis, DC voltammetry, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The experiments showed ennoblement of the alloys with increase in Nb concentration. High corrosion resistance was achieved when Nb content in the alloy exceeded ~26 at.%. EIS data indicated the presence of two oxygen containing layers on the corroding surface: a thin and highly protective one next to the metal, and much thicker, but porous and poorly protective layer on the top. It has been concluded that corrosion reactions occur predominantly within the pores of the thin protective layer composed of MgO+NbO. By changing Nb content the corrosion rate of Mg-Nb alloys could be adjusted according to biomedical in vivo requirements.

Keywords: Mg-Nb alloy, magnetron sputtering, Hank’s solution, voltammetry, EIS

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