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h i g h l i g h t s < Development of ABSegraphiteeMWNT composite bipolar plates. < EIS successfully applies for understanding the corrosion mechanism of the composites. < MWNT concentration strongly affects the corrosion behavior of the ABSegraphite composites. < The best balance of properties was for the ABS-graphite composite with addition of 2 wt.% MWNT. a b s t r a c tComposite bipolar plates based on the proper mixing of multi-walled carbon nanotubes (MWNTs), synthetic graphite particles and acrylonitrileebutadieneestyrene (ABS) powder have been produced by hot compression molding. The corrosion properties of the molded plates were assessed through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. Through-plane and in-plane electrical conductivities were determined. The relevance of electrochemical oxidation to the electrical conductivity of the composites was assessed by cyclic voltammetry. Thermal stability of the composites was examined by thermogravimetric analysis (TGA). The morphology of fractured surfaces of the plates was observed by scanning electron microscopy. The incorporation of MWNTs increased the inplane and through-plane electrical conductivity of the ABSegraphite composites. There was, though, a corresponding reduction of the corrosion resistance. The thermal behavior was little affected by the addition of MWNTs.