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Electrically conductive coatings are required for static charge dissipation in power ground network.In the present investigation electrically conductive nanocoatings were prepared by the incorporation of graphite,nano-SiO_2concentrate,acrylic nanoemulsion and fluorocarbon emulsion onto the waterborne epoxy polymer.The nanosize distribution of nano-SiO_2 concentrate and nanoemulsion was characterized with laser diffraction analyzer and scanning electron microscopy(SEM).From the results of SEM image,the graphite particles were well distributed in conductive coating.The corrosion resistance and thermal stability of nanocoatings were comparatively studied by SEM and thermogravimetry(TG).The corrosion-inhibiting properties of the conductive nanocoatings were investigated by salt immersion test.The measurements of contact angle,bonding strength and heat-freeze charge demonstrated that 1.5—2.0 wt%nanoparticles improve the resistance to pollution,adherence and resistance to heat-freeze charge of conductive nanocoatings.The measured results of surface electric resistance of nanocoatings demonstrated that a small amount of nanoSiO_2 particles could enhance the conductivity in the corrosive environment.
Electrically conductive coatings are required for static charge dissipation in power ground network. In the present investigation electrically conductive nanocoatings were prepared by the incorporation of graphite, nano-SiO 2concentrate, acrylic nanoemulsion and fluorocarbon emulsion onto the waterborne epoxy polymer. Nanosize distribution of nano- SiO 2 concentrate and nanoemulsion was characterized with laser diffraction analyzer and scanning electron microscopy (SEM). Fro the results of SEM image, the graphite particles were well distributed in conductive coating. The corrosion resistance and thermal stability of nanocoatings were comparatively studied from SEM and thermogravimetry (TG). The corrosion-inhibiting properties of the conductive nanocoatings were investigated by salt immersion test. The measurements of contact angle, bonding strength and heat-freeze charge demonstrated that 1.5-2.0 wt% nanoparticles improve the resistance to pollution, adherence and resistance to heat-freeze charg e of conductive nanocoatings.The measured results of surface electric resistance of nanocoatings said that a small amount of nanoSiO_2 particles could enhance the conductivity in the corrosive environment.