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Systematic electrical and physicomechanical studies have been carried out on natural rubber (NR) blended with synthetic rubber ethylenepropylene diene monomer (EPDM) as non-polar rubber. The permittivity (" 0 ) and dielectric loss (" 00 ) of this blend have been measured over a wide range of frequencies (42 Hz-5 MHz) at room temperature (%25 C). Compatibility of NR-EPDM can be enhanced by the addition of compatibilizers, such as polybutadiene (BR), chlorinated rubber, chloro-sulfonated polyethylene (SPE), polyvinyl chloride (PVC), and graft copolymerization of EPDM with metallic anhydride [EPDM-g-MAH]. The compatibility results obtained from the dielectric measurements are comparable with those obtained from the calculation of the strain energy, fatigue, mechanical failure tests, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The results

This study investigated the corrosion stability of high velocity oxy-fuel (HVOF) spray SUS316L coatings on aluminium substrate as lightweight bipolar plate materials for proton exchange membrane fuel cells (PEMFC). Contact resistance, microhardness and structure of the coatings were characterised using a four-point probe, pneumatic microhardness, XRD and scanning electron microscope techniques. Preliminary electrochemical results indicate that the SUS316L coated plates significantly lowered the corrosion current of the aluminium substrate by more than one order of magnitude. Corrosion stability in relation to the coating thickness is discussed in terms of the structure composition and transpassivity of chromium.