The corrosion of titanium in H2SO4 electrolytes (0.001-1.0 M) at temperatures from ambient to 98 degrees C has been investigated using steady-state polarization measurements. Four distinct regions of behaviour were identified, namely active corrosion, the active-passive transition, passive region and the dielectric breakdown region. The active corrosion and active-passive transition were characterized by anodic peak current (i(m)) and voltage (Em), which in turn were found to vary with the experimental conditions, i.e., d(log(i(m)))/dpH = -0.8 +/- 0.1 and dE(m)/dpH which was -71 mV at 98 degrees C, -58 mV at 80 degrees C and -28 mV at 60 degrees C. The activation energy for titanium corrosion, determined from temperature studies, was found to be 67.7 kJ mol(-1) in 0.1 M H2SO4 and 56.7 kJ mol(-1) in 1.0 M H2SO4. The dielectric breakdown voltage (E-d) of the passive TiO2 film was found to vary depending on how much TiO2 was present. The inclusion of Mn2+ into the H2SO4 electrolyte, as is done during the commercial electrodeposition of manganese dioxide, resulted in a decrease in titanium corrosion current, possibly due to Mn2+ adsorption limiting electrolyte access to the substrate. (c) 2005 Elsevier Ltd. All rights reserved.