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Electrochemical studies on zirconium and its biocompatible alloys Ti‐50Zr at.% and Zr‐2.5Nb wt.% in simulated physiologic media
Author(s) -
Oliveira Nilson T.C.,
Biaggio Sonia R.,
RochaFilho Romeu C.,
Bocchi Nerilso
Publication year - 2005
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.30352
Subject(s) - materials science , corrosion , anodizing , pitting corrosion , alloy , zirconium , electrochemistry , oxide , zirconium alloy , metallurgy , biocompatible material , cyclic voltammetry , nuclear chemistry , aluminium , electrode , biomedical engineering , chemistry , medicine
Different electrochemical studies were carried out for Zr and its biocompatible alloys Ti‐50Zr at.% and Zr‐2.5Nb wt.% in solutions simulating physiologic media, Ringer and PBS (phosphate buffered saline) solutions. The results from rest‐potential measurements showed that the three materials are spontaneously passivated in both solutions and that the Ti‐50Zr alloy has the greatest tendency for spontaneous oxide formation. Some corrosion parameters (such as the pitting and repassivation potentials) were obtained via cyclic voltammetry in both solutions, revealing that the Ti‐50Zr has the best corrosion protection while Zr has the worst. On the other hand, the pre‐anodization (up to 8 V vs. SCE) of the alloys in a 0.15 mol/L Na 2 SO 4 solution led to a significant improvement in their protection against pitting corrosion when exposed to the Ringer solution. Elemental analyses by EDX showed that during pitting corrosion, there is no preferential corrosion of any of the alloying elements (Zr, Ti, Nb). © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2005