MECHANISM AND KINETICS OF THE ACTIVE AND ACTIVE-PASSIVE DISSOLUTION OF TITANIUM IN ACIDIC MEDIA

A new mechanism of dissolution of titanium in active and active-passiv e states is suggested. The model eliminates some contradiction between existing theories and actual experimental observations. It is based o n the Temkin isotherm and assumes a linear dependence of surface cover age by hydrogen on the potential. The stage of activated transition of titanium from the hydride into the adsorbed state is regarded as the factor controlling active corrosion. The current-potential dependence has a parabolic shape and correlates well with experimental data.