EIS study of Ti-23Ta alloy in artificial saliva

Authors: Robin, A.1; Meirelis, J.P.2

Source: Corrosion Engineering, Science and Technology, Volume 44, Number 5, October 2009 , pp. 352-357(6)

Publisher: Maney Publishing

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Abstract:

Although titanium and Ti-6Al-4V alloy have been widely used as dental materials, possible undesirable effects such as cytotoxic reactions and neurological disorder due to metal release led to the development of more corrosion resistant and V and Al free titanium alloys, containing Nb, Zr, Mo and Ta atoxic elements. Fluoride containing products used in the prevention of plaque formation and dental caries can affect the stability of the passive oxide films formed on the Ti alloys. In this work, the corrosion behaviour of the new Ti-23Ta alloy has been evaluated in artificial saliva of different pH and fluoride concentration using electrochemical impedance spectroscopy. Electrochemical impedance spectroscopy study showed that the oxide film formed on the alloy in artificial saliva consists of an inner compact film and an outer porous layer. The corrosion resistance of Ti-23Ta alloy which is reduced by increasing F concentration or decreasing pH is related to the resistance of the inner compact layer. The presence of fluoride and low pH of the saliva enhance the porosity of the oxide film and its dissolution.

Keywords: TITANIUM ALLOY; CORROSION; PASSIVATION; SALIVA; ACIDITY; FLUORIDE; EIS

Document Type: Research article

DOI: 10.1179/147842208X338992

Affiliations: 1: Departamento de Engenharia de Materiais, Escola de Engenharia de Lorena, Universidade de São Paulo, Estrada Municipal do Campinho, CEP 12·601-810, Lorena, São Paulo, Brazil;, Email: alain@demar.eel.usp.br 2: Departamento de Engenharia de Materiais, Escola de Engenharia de Lorena, Universidade de São Paulo, Estrada Municipal do Campinho, CEP 12·601-810, Lorena, São Paulo, Brazil

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