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Comparative electrochemical characterization of plasma sprayed zirconia and alumina coatings on titanium substrate

C. PAPATOIU1, R. CHELARIU2, G. BOLAT3, C. MUNTEANU1,* , D. MARECI3

Affiliation

  1. “Gheorghe Asachi” Technical University of Iasi, Faculty of Mechanical Engineering, 43 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
  2. “Gheorghe Asachi” Technical University of Iasi, Faculty of Materials Science and Engineering, 41 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
  3. “Gheorghe Asachi” Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 73 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania

Abstract

Current ceramic solutions for applications in wear and thermal shock technology is now a necessity. The electrochemical characteristics of yttrium oxide stabilized zirconium oxide (YsZ) and alumina (Al2O3) coatings produced on titanium (Ti) targets were investigated in natural seawater. All coatings were produced by plasma spraying deposition. In order to study the electrochemical behaviour, the electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization (LPP) performed. Equivalent circuit (EC) was used to modeling EIS data, in order to characterize YsZ and Al2O3 coated Ti surface. Scanning electron microscopy (SEM) observations were made before and after the LPP tests. It was found that both YsZ and Al2O3 coating showed a good corrosion resistance (polarization resistance and corrosion current density) after 1-day immersion in natural seawater. The Ti substrate was actually passive in these experimental conditions..

Keywords

Zirconia, Alumina, Natural seawater, SEM, EIS, LPP.

Submitted at: Aug. 13, 2014
Accepted at: Sept. 11, 2014

Citation

C. PAPATOIU, R. CHELARIU, G. BOLAT, C. MUNTEANU, D. MARECI, Comparative electrochemical characterization of plasma sprayed zirconia and alumina coatings on titanium substrate, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 9-10, pp. 1093-1098 (2014)