Features of the Anode Behavior of a Combined Titanium–Aluminum Electrode and the Physicochemical Properties of the Products of Its Dissolution

The electrochemical behavior of a combined titanium–aluminum electrode in aqueous solutions of 1.0 M sodium chloride with additions of hydrofluoric acid has been studied. It is shown that, under open-circuit conditions, the combined electrode is a short-circuited element, the surface of which is practically equipotential and is characterized by the value of the potential located between the values of the corrosion potentials of aluminum and iron electrodes. With a low content of hydrofluoric acid, practically the entire anode current flows through the surface of the aluminum component of the combined electrode. In addition, with an increase in the HF concentration to 0.5 M, the titanium electrode is activated and the fraction of the current flowing is almost the same as the fraction of the current of the aluminum component of the anode. This makes it possible to regulate the dissolution rates of aluminum and titanium during their joint oxidation during the synthesis of precursors of metal oxides of a given phase composition by changing the ratio of the areas of the anode components.