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Correlation between the Susceptibility to Breakdown and Surface Properties of Thin Films on Titanium Alloys in Physiological Fluids

Published online by Cambridge University Press:  15 February 2011

Agustin Santana Lopez ,
Julia Mirza-Rosca ,
Mihai V. Popa ,
Ioana Demetrescu ,
Ecaterina Vasilescu ,
Paula Drob ,
Cora Vasilescu  and
Daniela Ionita
Agustin Santana Lopez
Affiliation:
Las Palmas de Gran Canaria University, Despacho 11, 35017 Tafira, Gran Canaria, Spain.
Julia Mirza-Rosca
Affiliation:
Las Palmas de Gran Canaria University, Despacho 11, 35017 Tafira, Gran Canaria, Spain.
Mihai V. Popa
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania.
Ioana Demetrescu
Affiliation:
Politehnica University, Str. Polizu nr.1, 78126 Bucharest, Romania.
Ecaterina Vasilescu
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania.
Paula Drob
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania.
Cora Vasilescu
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania.
Daniela Ionita
Affiliation:
Politehnica University, Str. Polizu nr.1, 78126 Bucharest, Romania.
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Abstract

Correlation between the susceptibility to breakdown and surface properties of thin films on implant titanium alloys Ti-5Al-4V and Ti-6Al-4Fe in Ringer 1 and Ringer 2 solutions of different pH values (6.98, 4.35, 2.5) which simulate the conditions that can appear at the longterm (13,000 hours) contact between implant and tissues were studied in this paper. The passive films are very stable up to +1.8 V; Ti-6Al-4Fe alloy presents pitting attack at a pitting initiation potential of +3.5 V in Ringer 1 solution and at +3.9 V in Ringer 2 solution. The pitting protection potential is about +1.75 V in both solutions; this is a very noble potential. Impedance spectra were modeled with one time constant equivalent electrical circuit, typically for a compact oxide film, for all materials, in all tested solutions. The fitting parameters indicate a long-term stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 781: Symposium Z – Mechanisms in Electrochemical Deposition and Corrosion , 2003 , Z3.3
Copyright
Copyright © Materials Research Society 2003

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