Electrochemical characterization and passivation behaviour of new beta-titanium alloys (Ti35Nb10Ta-xFe)
| Autor: | J. Navarro Laboulais, A. Igual Muñoz, V. Amigó Borrás, A. Amigó Mata |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Passivation General Chemical Engineering Alloy Oxide 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Electron Microscopy Service of the UPV INGENIERIA QUIMICA chemistry.chemical_compound Electrochemical Impedance Spectroscopy Powder metallurgy CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA Electrochemistry Titanium alloys Beta-titanium passivity Composite material Metallurgy Titanium alloy 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy powder metallurgy chemistry engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1016/j.electacta.2016.12.125 |
| Popis: | [EN] Passivation kinetics is a crucial factor in the electrochemical behavior of passive metals and alloys when subjected to operating conditions in real systems such as biomedical devices or aeronautical applications. The aim of this work is to describe the passivation behavior of new beta-titanium alloys (Ti35Nb10Ta-xFe with x = 1.5, 3 and 4.5 where numbers indicate the %wt in the alloying elements) obtained by powder metallurgy using different electrochemical techniques and existing theoretical models for oxide film growth (High Field Model, HFM, and Interface Models, IFM). Influence of Fe content in the alloy and prevailing lectrochemical conditions (i.e. applied potential) on the kinetic parameters were analyzed. The oxide film growth can be described by a HFM approach considering that the film thickness is related to the current flowing through the system, thus constant values for passive film formation were considered. The electric field in the film and the thickness of the oxide layer were quantified. Iron content in the alloy does not significantly modifies the passive film properties of the obtained materials but decreases the passive film growth of the resulting alloy. The applied potential reduces the electric field in the oxide layer while increasing its thickness. The authors thank Spanish Government, "Ministerio de Economia y Competitividad" (project reference MAT2014-53764-C3-1/3) and to the Generalitat Valenciana PROMETEO 2016/040 for the economic support. They would like also to thank the Electron Microscopy Service of the UniversitatPolitecnica de Valencia for the microstructural characterisation. |
| Databáze: | OpenAIRE |
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