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Effect of vanadium replacement by zirconium on the electrochemical behavior of Ti6Al4V alloy in Ringer´s solution
Autori: Adrian Cailean, Daniel Mareci, Daniel Sutiman, Igor Creţescu
Data aparitiei: November/December 2008
Revista: Environmental Engineering and Management JournalVol. 7Nr. 6
ISSN: 1843 - 3707
Pret: Gratuit    
Format PDF Format PDF
Abstract
The electrochemical behaviour of Ti6Al4V and Ti6Al4Zr alloys has been evaluated in Ringer's solution at 250C. The effect of the substitution of vanadium in Ti6Al4V alloy has been specifically addressed. The evaluation of the corrosion resistance was carried out through the analysis of the open circuit potential variation with time, potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS) tests. Very low current densities were obtained (order of nA/cm2) from the polarization curves and EIS, indicating a typical passive behaviour for both investigated alloys. The EIS results exhibited capacitive behaviour (large corrosion resistance) with phase angle close to -800 and high impedance values (order of 105 ?™ cm2) at low and medium frequencies, which are indicative of the formation of a highly stable film on these alloys in Ringer’s solution. In conclusion, the electrochemical behaviour of Ti6Al4V is not affected on substituting vanadium with zirconium.



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