The corrosion behavior of titanium (TA2), boron-doped diamond (BDD) coated titanium and mixed metal oxide (MMO) coated titanium were studied using electrochemical impedance spectrum (EIS) in simulated solid polymer electrolyte (SPE) water electrolyte conditions at 80 degrees C. At imposed anodic potential, after about 240 h electrolysis, the bigger capacitance and reaction resistance values were observed for MMO coated titanium material, which demonstrated that MMO coated titanium has more corrosion-resistance performance. SEM photos showed that ten days electrolysis don't do much harm to MMO coated titanium material in simulated SPE water electrolysis environment. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.