COMPOSITE FABRICATION OF EPOXY AND GRAPHENE OXIDE COATING TO ENRICH THE ANTICORROSION AND THERMAL PROPERTIES OF CARBON-STEEL

Abstract

Graphene oxide (GO) concentrated slurry dispersion method was used to prepare the GO epoxy thermal insulation and anti-corrosion coating. Corrosion test was carried out in 3.5% NaCl solution at 50∘C, and a thermal testing device tested the thermal insulation performance. The results of the electrochemical corrosion test after 456[Formula: see text]h show that the low-frequency impedance of the coating with 0.5% GO-modified significantly improved, and the corrosion resistance of the coating is better than that of the coating without GO and 1.0% GO-modification. SEM analysis results show that surface morphology of the coating modified with GO 0.5% and 1.0% after 456 h of corrosion, there were no cracks and corrosion products at the substrate interface. In contrast, coatings without GO modification have apparent corrosion damage. Before corrosion testing, the thermal insulation performance of coating modified by 0.5%, 1.0% GO coating was not significantly different from that of the neat epoxy. The bonding strength is also reduced to 3.9, 2.3, and 1.0 MPa. The experimental results show that the coating with 0.5% GO modified is the best for corrosion resistance and insulation.