The corrosion of carbon materials in the presence of Pt catalyst was studied in pH 0.3～11.8 using mass spectrometric cyclic volatmmetry (MSCV), the corrosion was found to be greatly accelarated by Pt for both active carbon and acetylene black as evidenced by a negative shift of the onset optential (ΦS)of CO2 evolution which is more negative than the O2/H2O equilibrium potential. both active carbon and acetylene black are corroded when they are used for either anodes of ΦS and the overpotential ηS of the onset of CO2 evolution (they follow broken lines deflecting near pH=7)while the situation is more complicated for acetylene black. the presence of Pt changes the ΦS-PH and ηS-PH from broken lines into straight lines. moreover, there are two waves on the IM-Φ curves for CO2 formation, probably indicating two types of oxides on the acetylene black surfaces.

Key words: PLATINUM, CATALYST, CARBON ELECTRODES, ELECTROCHEMICAL CORROSION