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Preliminary testing of corrosion characteristics of NiTi alloy coated with various polymers

R. HANU CIMPOESU1,* , D. MARECI2, N. AELENEI2, G. BOLAT2, C. BACIU1, T. CONSTANTIN3, M. AGOP4

Affiliation

  1. “Gheorghe Asachi” Technical University of Iasi, Faculty of Materials Science and Engineering, 61A Mangeron Blvd., 700050, Iasi, Romania
  2. “Gheorghe Asachi” Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 73 Mangeron Blvd., 700050, Iasi, Romania
  3. “Apollonia” University of Iasi, str. Păcurari nr.11 Iasi 700511
  4. “Gheorghe Asachi” Technical University of Iasi, Department of Physics, Iasi, Romania

Abstract

In this work are presented preliminary tests of corrosion characteristics of NiTi alloy coated with three different polymers coatings deposited by pulser laser deposition. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) have been employed to study the corrosion performance of the NiTi coated samples in AFNOR artificial saliva. All the polymers coating showed a very corrosion resistance for a short-term immersion. The EIS results exhibited high impedance values (order of 106 Ω cm2 ) obtained from medium to low frequencies which are indicative of the presenting of a highly stable film on all coated NiTi alloys in the artificial saliva. The EIS spectra are fitted using an equivalent circuit. For NiTi coated samples maintained short time in artificial saliva, a two-layer model of an unsealed porous film is suitable..

Keywords

Corrosion NiTi alloy, Polymers.

Submitted at: May 31, 2011
Accepted at: Oct. 20, 2011

Citation

R. HANU CIMPOESU, D. MARECI, N. AELENEI, G. BOLAT, C. BACIU, T. CONSTANTIN, M. AGOP, Preliminary testing of corrosion characteristics of NiTi alloy coated with various polymers, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 10, pp. 1305-1308 (2011)