Abstract: Hybrid composite rods, comprised of unidirectional reinforcing carbon/glass-fiber and adhesive epoxy matrix, are regarded as promising candidates to be used in high-voltage overhead conductors. Before widespread application, their acid resistance needs to be clarified. But up to now, the study on this topic is still blank. In this study, Nitric acid resistance for hybrid composite rods, both epoxy resin castable and composites cores, is studied by immersing in 1 mol/L nitric acid for a long time. The sample come from different vendors are compared under the same conditions. The tensile strength of resin castable and tensile strength of cores are tested by electronic universal tester. It is found that the acid corrosion resistance of composites core depends on both the corrosion resistance of epoxy resin and the glass fiber specis. The epoxy resin exhibits different trends after 6000 h nitric acid immersing. E-CR glass fiber composites core have the better acid resistance than E glass fiber composites core. All above results can be used as experimental basis and selection criteria for carbon fiber composites core conductor overhead line design and operation.

Key words: carbon fiber composites core conductor, epoxy resin castable, nitric acid corrosion resistance, stress corrosion