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Passive Layer Breakdown on Titanium in Doped and Undoped Artificial Saliva

Published online by Cambridge University Press:  15 February 2011

Ioana Demetrescu ,
Mihai V. Popa ,
Ecaterina Vasilescu ,
Paula Drob ,
Belarisa Popescu ,
Daniela Ionita  and
Cora Vasilescu
Ioana Demetrescu
Affiliation:
Politehnica University, Str. Polizu no. 1, 78126 Bucharest, Romania
Mihai V. Popa
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 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
Belarisa Popescu
Affiliation:
Politehnica University, Str. Polizu no. 1, 78126 Bucharest, Romania
Daniela Ionita
Affiliation:
Politehnica University, Str. Polizu no. 1, 78126 Bucharest, Romania
Cora Vasilescu
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania
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Abstract

The aim of this work is to investigate the long term (3000 exposure hours) tendency of passive layers on titanium to breakdown in Tani-Zucchi and Carter-Brugirard artificial saliva undoped and doped with chloride and fluoride ions. The non-uniformity of the saliva pH (from 7.88 to 5.73 and extreme case 2.15) was simulated. The following techniques were used: potentiostatic, potentiodynamic and linear polarization, the monitoring of the open circuit potentials vs. exposure time and atomic force microscopy. The breakdown (pitting) potential at about +2.9 V and the re-passivation potential at +2.4 V in Tani-Zucchi artificial saliva were determined. So, the pitting protection potential is very noble and can not be reached in human body.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 781: Symposium Z – Mechanisms in Electrochemical Deposition and Corrosion , 2003 , Z3.5
Copyright
Copyright © Materials Research Society 2003

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