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Effect of scan rates and imposed potentials on the formation and growth of oxide film on Ti6Al4V alloy surface in 3% NaCl
Published online by Cambridge University Press: 23 September 2011
Abstract
In the present study, the formation and growth of an oxide film on a titanium alloy Ti6Al4V surface immersed in 3% NaCl solution using anodisation at various imposed potentials was investigated by two electrochemical techniques, cyclic polarisation and impedance measurements. In the cyclic polarisation studies at different scan rates, the obtained curves show a large range of passivation, due to the formation of a protective oxide film, generally TiO2. In addition, the negative hysteresis that appeared during the cyclic polarisation with the shift of the corrosion potential in the more noble direction (approximately +260 mV) may be explained by a reduction of the corrosion products. 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 of corrosion. The impedance measurements (Nyquist and Bode plots) at various imposed potentials show that Ti6Al4V has a capacitive behaviour in the passive field, due to the formation and growth of the oxide film.
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- © EDP Sciences, 2011
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