Electrochemical characteristics of Ti–6Al–4V alloy in 0.2 N NaCl solution

Electric fields in the anodic oxides of Ti–6Al–4V ELI alloy in 0.2 N NaCl solution have been evaluated by considering the potential drops at interfaces and their variation during the polarization. Constant electric field in the order of 10 ⁶ V cm ⁻¹ was obtained for all the potentiostatic polarizations in this study, independent of potential, thickness of oxide, and polarization time. The kinetic behaviors associated with a constant field mechanism are also presented. The logarithm of the anodic current and the charge follow the empirical relationship i=A exp (−Q/B) , where i is the anodic current, Q is the transported charge, A and B are constants. The involved parameters are determined and are in excellent agreement with theoretical predictions.