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

Effect of Experimental Parameters on Passivation Phenomena of Ti6Al4V Alloy in Acid Solution

“…The values of impedance parameters given in table 3 indicate that the resistance values, film thickness and exponent n gradually increase with the increase in potential, whereas the capacitance decreases. The results are in good agreement with our previous work [29]…”

“…Fig. 1 show the variation of open circuit potential of Ti6Al4V with time, the potential decreases with time until reaching a less noble value near -275 mV after 15 minutes; this behavior is different from that of Ti6Al4V in 3% NaCl solution [29], this behaviour is probably related to the pH of the medium.…”

Anodic Electrochemical Behaviors of 2219 Aluminum Alloy in NaNO3 and NaCl Electrolytes

“…This passivation film inhibits the sample's dissolution, leading to a positive shift in the OCP value. 9 In electrochemical tests, the formation of a passivation film on the matrix material's surface impedes the rate of ion exchange between the metal surface and the electrolyte, resulting in an increase in the corresponding OCP value.…”

“…For the open circuit potential (OCP) test, samples underwent cathodic pre-polarization at −2.1 VSCE for 2 min to remove the oxide film formed on their surfaces in the air, 9 and then OCP was measured for 5 h. Electrochemical impedance spectroscopy (EIS) tests were conducted with an amplitude of 10 mV and a frequency range spanning from 100,000 Hz to 0.01 Hz. Scanning electron microscopy (SEM, Regulus 8100, Hitachi, Japan) with energy dispersive spectrometry (EDS, Oxford, Ultim max, America) and X-ray photoelectron spectroscopy (XPS, Scientific K-Alpha, Thermo, America) were employed to gather additional information about the newly formed passive film.…”

“…7 Clifton et al 8 observed that processing TiAl with perchlorate could diminish the material's surface hardness. Nouicer et al 9 conducted anodic oxidation in 3% NaCl electrolyte at varying applied potentials, noting that lower scanning rates correlated with reduced passivation current, while the scanning rate had no significant impact on corrosion potential or current. Dalmau et al 10 investigated the electrochemical behavior of three biomedical near-β titanium alloys (composed of Ti, Nb, and Sn) prepared by powder metallurgy.…”