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Electrochemical and SEM studies of a new implant bioalloy in physiological electrolytes
Author(s) -
Popa M. V.,
Vasilescu E.,
Drob P.,
Mareci D.,
Moreno J. M. Calderon,
Ivanescu S.,
Vasilescu C.,
Rosca J. C. Mirza
Publication year - 2009
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200905382
Subject(s) - scanning electron microscope , dielectric spectroscopy , materials science , alloy , corrosion , pitting corrosion , electrolyte , electrochemistry , open circuit voltage , magnesium , magnesium alloy , phase (matter) , energy dispersive x ray spectroscopy , chemical engineering , metallurgy , analytical chemistry (journal) , composite material , electrode , chemistry , voltage , physics , organic chemistry , quantum mechanics , chromatography , engineering
A new implant Ti–7Al–3V–2Mo–2Fe alloy was elaborated and its behaviour in Ringer–Brown and Ringer solutions (of different pH values) was studied using cyclic potentiodynamic and linear polarisation, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) with its link energy dispersive X‐ray system (EDX). Cyclic potentiodynamic polarisation curves revealed that the Ti–7Al–3V–2Mo–2Fe alloy is self‐passivated in Ringer solutions. Pitting corrosion appeared in alkaline Ringer solution but at very electropositive values of the breakdown and pitting protection potentials and it is not possible to develop local corrosion on this alloy, even in extreme functional conditions. EIS spectra at open circuit potential exhibited two phase angles characterising a resistant passive film and some charge transfer reactions. SEM–EDX analysis shows the presence of some aggregates containing complex compounds of calcium, magnesium, phosphor, silicon deposited on the alloy surface.