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Electrochemical evaluation of the stability of ceramic nanostructured titanium oxide layers in Ringer solution

I. ROMAN1,* , C. FRATILA2, E. VASILE1, A. PETRE3, M.-L. SOARE1

Affiliation

  1. METAV Research & Development, 02001, C.A.Rosetti St., no. 31, Bucharest, Romania
  2. Research & Development National Institute for Nonferrous and Rare Metals - INCDMNR-IMNR, Bucharest, Romania
  3. UMF “Carol Davila”, Dental Medicine Faculty, Bucharest, Romania

Abstract

The paper presents the results of the stability evaluation by electrochemical polarization of experimental samples in a synthetic biological electrolyte, the Ringer solution. The cyclic voltammetry and the transmission electronic microscopy investigations show that the anodically oxidized and thermally untreated samples posses a thin, nanostructured, stable oxidic layer, with an ohmic behavior in the case of TA6V4 alloy. Titanium shows a typical behavior of electrochemically passivating metal, by polarization being evidenced a critical passivation potential with a corresponding critical current and a passivity domain characterized by a reduced passivity current. The electrochemical reactivity of the samples is unfavorably raised by thermal processing at 350 and 600o C in air, when the presence of detrimental anatase in the layers is evidenced by X-ray diffraction analysis. The same analysis shows that the favorable rutille appears in the the oxidic layer at 600o C, but it predominates or even becomes exclusive after the thermal treatment in air at 770o C. The thermochemical treatment at this temperature and the resulted crystalline nanostructures ensure an increase of the interface stability and an improvement of the ohmic behavior and biocompatibility characteristics for the oxidic layers achieved by following an anodic oxidation formula, both on titanium and its alloy..

Keywords

Biomaterials, Titanium, Anodization, Cyclic voltammetry, Anatase, Rutile, X-Ray Diffractometry.

Submitted at: Feb. 24, 2010
Accepted at: July 14, 2010

Citation

I. ROMAN, C. FRATILA, E. VASILE, A. PETRE, M.-L. SOARE, Electrochemical evaluation of the stability of ceramic nanostructured titanium oxide layers in Ringer solution, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 7, pp. 1597-1603 (2010)