Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/48950
Título: Corrosion Behavior of Some Titanium Base Alloys in Acid Solutions
Autores/as: Popa, M. V.
Vasilescu, E.
Drob, P.
Vasilescu, C.
Mirza-Rosca, J. 
Lopez, A. Santana
Palabras clave: Anodic Oxide-Films
Omega Phase
Ti
Al
Aluminum, et al.
Fecha de publicación: 2005
Editor/a: 1042-6914
Publicación seriada: Materials and Manufacturing Processes 
Resumen: Corrosion and passivation behavior of new, ternary titanium alloys Ti-10Mo-10Al and Ti-15Mo-5Al in nitric acid solutions of different concentrations (20% and 60%) and temperatures (25degrees, 50degrees, and 75degreesC) is presented in this paper. Electrochemical impedance spectroscopy (EIS) data were obtained at different potentials as Bode plots. The spectra show some deviations from the ideal behavior, which demonstrate the necessity to consider a complex equivalent circuit with two time constants. This equivalent circuit is composed of the uncompensated ohmic resistance of the solution (R-Omega), the double layer capacity (C-dl) in parallel with the polarization resistance (R-p) for a passive film, and a Warburg element (W) associated with a resistance (R-1) for the diffusion processes. The anodic polarization curves present the self-passivation of these alloys. Both titanium and its ternary alloys directly pass into a passive state, due to the fact that, in strong oxidizing nitric acid solutions, the titanium directly oxidizes to Ti4+ ions and spontaneously forms titanium dioxide TiO2. The passivation of the titanium alloys is due to the compact and protective film containing titanium dioxide, TiO2, and some insoluble molybdenum oxide, MoO3.
URI: http://hdl.handle.net/10553/48950
ISSN: 1042-6914
DOI: 10.1081/AMP-200041602
Fuente: Materials and Manufacturing Processes[ISSN 1042-6914],v. 20, p. 35-45
Colección:Actas de congresos
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