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Improving corrosion stability and antibacterial activity of the titania coatings by plasma electrolytic oxidation

M. M. DICU1, M. URSU2, C. UNGUREANU3, P. C. DICU1, S. POPESCU3,*

Affiliation

  1. University of Pitesti, Faculty of Mechanics and Technology, Targu din Vale, No 1, 110040, Pitesti, Romania
  2. Renault Technologie Roumanie, Uzinei, No 1-3, 115400, Mioveni, Arges, Romania
  3. University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, Polizu no 1-7, 011061, Bucharest, Romania

Abstract

The titania (TiO2) coatings containing Ca and P was successfully deposited on titanium substrate by plasma electrolytic oxidation (PEO) technique. The electrolyte was a mixture consisting of β-glycerophosphate disodium salt pentahydrate and calcium acetate monohydrate. The obtained surfaces were characterized using SEM, XRD, AFM, FTIR and contact angle measurements in order to obtain morphological, topographical, compositional features and wettability of the surface. The electrochemical behavior of the Ti/TiO2 coating was tested in buffer solution. The corrosion parameters obtained from linear polarisation measurements, electrical parameters from electrochemical impedance spectroscopy and cyclic potentiodynamic polarisation were obtained. The antibacterial activity of the TiO2 coatings against Escherichia coli was examined by bacterial counting method. Percentage inhibition of bacteria growth was determined by streak method. The results showed a good electrochemical stability, combined with positive results regarding their antibacterial activity and in vitro cytotoxicity..

Keywords

Titania, Plasma electrolytic oxidation, Surface analysis, Corrosion stability, Antibacterial activity, In vitro cytotoxicity.

Submitted at: Sept. 29, 2015
Accepted at: Oct. 28, 2015

Citation

M. M. DICU, M. URSU, C. UNGUREANU, P. C. DICU, S. POPESCU, Improving corrosion stability and antibacterial activity of the titania coatings by plasma electrolytic oxidation, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 11-12, pp. 1816-1825 (2015)