The chemical and electrochemical properties of solutions of titanium chlorides in the fused CaCl2 + NaCl equimolar mixture were studied at 550 degrees C using different working electrodes. We determined the stability range of the various oxidation states of titanium and calculated the standard potentials of the Ti(III)/Ti(II) and Ti(II)/Ti(0) redox couples, the solubility products of the titanium oxides, the kinetic parameters of the electrochemical systems at the different electrodes and the diffusion coefficients of the electroactive species. We have also studied the titanium electrodeposition process by potential step measurements which indicated instantaneous nucleation of titanium at tungsten substrates. All these data allowed us to build-up the potential-pO(2-) diagram which summarizes the properties of Ti-O compounds in the melt studied and can be used (together with the E-pO(2-) diagram of chlorinating gaseous mixtures) to predict operating conditions for the process of industrial production of metallic titanium from molten salt systems.