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Effect of scan rates and imposed potentials on the formationand growth of oxide film on Ti6Al4V alloy surface in 3% NaCl

Published online by Cambridge University Press:  23 September 2011

E. Nouicer ,
F.Z. Benlahreche ,
L. Yahia ,
M. Eutamene  and
H. Chadli
E. Nouicer
Affiliation:
Laboratory of Phases Transformation, Department of Physics, Constantine University, 25000, Algeria. e-mail: [email protected]
F.Z. Benlahreche
Affiliation:
Industrial Chemistry Department, Constantine University, 25000, Algeria
L. Yahia
Affiliation:
Laboratory of Phases Transformation, Department of Physics, Constantine University, 25000, Algeria. e-mail: [email protected]
M. Eutamene
Affiliation:
Industrial Chemistry Department, Constantine University, 25000, Algeria
H. Chadli
Affiliation:
Metallurgy and Materials engineering Department, Annaba University, 23000, Algeria
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Abstract

In the present study, the formation and growth of an oxide film on a titanium alloyTi6Al4V surface immersed in 3% NaCl solution using anodisation at various imposedpotentials was investigated by two electrochemical techniques, cyclic polarisation andimpedance measurements. In the cyclic polarisation studies at different scan rates, theobtained curves show a large range of passivation, due to the formation of a protectiveoxide film, generally TiO2. In addition, the negative hysteresis that appearedduring the cyclic polarisation with the shift of the corrosion potential in the more nobledirection (approximately +260 mV) may be explained by a reduction of the corrosionproducts. It was found that the lower the scan rates the lower the passivation current,and the scan rates did not have a significant effect on the potential or current ofcorrosion. The impedance measurements (Nyquist and Bode plots) at various imposedpotentials show that Ti6Al4V has a capacitive behaviour in the passive field, due to theformation and growth of the oxide film.

Keywords

Titanium alloyelectrochemical techniquescyclic polarisationimpedance measurementpassivationAlliage de titanepolarisation cycliquepassivationmesures des impédances
Type
Research Article
Information
Metallurgical Research & Technology , Volume 108 , Issue 2 , 2011 , pp. 69 - 74
Copyright
© EDP Sciences, 2011

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