The anodic oxidation of vanadium in acetic acid‐sodium tetraborate solutions containing small amounts of water has been studied over a potential range of 100V using the open‐circuit transient analysis technique. An anodic layer which showed bright uniform interference colors was found to grow on the metal surface. Results of these experiments indicate that the dependence of the oxidation current density, i , on the formation potential, V , is expressible in the form i=io exp false(V/Vofalse) , where io and Vo are parameters determined from the data analysis. The parameter io is found to depend on the applied current density, while the parameter Vo varies directly with the formation potential during galvanostatic oxidation. A result in this form implies that the electric field in the oxide is a function of the applied current density. These results show similarities to results previously obtained by others for the anodic oxidation of bismuth, tantalum, and iron.