In this work, alternating current (AC) voltage (V AC ) is applied to Ti-6Al-4V alloy in aqueous oxalic acid dihydrate solution to grow passive oxide films. The oxide layers are formed with V AC values in the range of 10-80 V. The resulting surface oxide layers have estimated thicknesses in the 100-500 nm range and are expected to have a two-layer structure consisting of a porous outer layer and a compact inner layer. The AC anodization process is demonstrated to have a slight effect on the

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... ce roughness. Porous regions are observed on the films formed at lower and high AC voltages (i.e., V AC 10-30 and 80 V). The corrosion behavior in Ringer's solution over 48 h of exposure is studied with electrochemical impedance spectroscopy. The AC anodized samples have higher impedance values than the untreated alloy by more than an order of magnitude. The oxides formed at V AC = 40 − 70 V exhibit optimal resistance to corrosion as demonstrated by the overall impedance values, the polarization resistance values, and the capacitive behavior.