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Artículo

Influence of the electrolyte concentration on the smooth TiO2 anodic coatings on Ti-6Al-4V

Vera, Maria LauraIcon ; Colaccio, Ángeles; Rosenberger, Mario RobertoIcon ; Schvezov, Carlos EnriqueIcon ; Ares, Alicia EstherIcon
Fecha de publicación: 03/2017
Editorial: MDPI
Revista: Coatings
e-ISSN: 2079-6412
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Recubrimientos y Películas

Resumen

To obtain smooth TiO2 coatings for building a new design of Ti-6Al-4V heart valve, the anodic oxidation technique in pre-spark conditions was evaluated. TiO2 coating is necessary for its recognized biocompatibility and corrosion resistance. A required feature on surfaces in contact with blood is a low level of roughness (Ra ≤ 50 nm) that does not favor the formation of blood clots. The present paper compares the coatings obtained by anodic oxidation of the Ti-6Al-4V alloy using H2SO4 at different concentrations (0.1?4 M) as electrolyte and applying different voltages (from 20 to 70 V). Color and morphological analysis of coatings are performed using optical and scanning microscopy. The crystalline phases were analyzed by glancing X-ray diffraction. By varying the applied voltage, different interference colors coatings were obtained. The differences in morphologies of the coatings caused by changes in acid concentration are more evident at high voltages, limiting the oxidation conditions for the desired application. Anatase phase was detected from 70 V for 1 M H2SO4. An increase in the concentration of H2SO4 decreases the voltage at which the transformation of amorphous to crystalline coatings occurs; i.e., with 4 M H2SO4, the anatase phase appears at 60 V.
Palabras clave: Anodic Oxidation , Titanium Dioxide , Electrolyte Concentration , Sulfuric Acid
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/44436
URL: http://www.mdpi.com/2079-6412/7/3/39
DOI: http://dx.doi.org/10.3390/coatings7030039
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Articulos(IMAM)
Articulos de INST.DE MATERIALES DE MISIONES
Citación
Vera, Maria Laura; Colaccio, Ángeles; Rosenberger, Mario Roberto; Schvezov, Carlos Enrique; Ares, Alicia Esther; Influence of the electrolyte concentration on the smooth TiO2 anodic coatings on Ti-6Al-4V; MDPI; Coatings; 7; 3; 3-2017; 1-11
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