Enhanced protective properties and UV stability of epoxy/graphene nanocomposite coating on stainless steel

Abstract

Abstract. Epoxy-Graphene (E/G) nanocomposites with different loading of graphene were prepared via in situ prepolymerization and evaluated as protective coating for Stainless Steel 304 (SS304). The prepolymer composites were spin coated on SS304 substrates and thermally cured. Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) were utilized to examine the dispersion of graphene in the epoxy matrix. Epoxy and E/G nanocomposites were characterized using X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) techniques and the thermal behavior of the prepared coatings is analyzed using Thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). The corrosion protection properties of the prepared coatings were evaluated using Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV) measurements. In addition to corrosion mitigation properties, the long-term adhesion performance of the coatings was evaluated by measuring the adhesion of the coatings to the SS304 substrate after 60 days of exposure to 3.5 wt% NaCl medium. The effects of graphene loading on the impact resistance, flexibility, and UV stability of the coating are analyzed and discussed. SEM was utilized to evaluate post adhesion and UV stability results. The results indicate that very low graphene loading up to 0.5 wt % significantly enhances the corrosion protection, UV stability, and impact resistance of epoxy coatings.

Retracted: Enhanced protective properties and UV stability of poly(lactic acid)/poly(vinyl acetate)/ZnO microcapsule nanocomposite

“…Furthermore, these tensile strength and elongation The tensile strength and elongation of PLA/PVAc/ZnO microcapsule composites were higher than these of neat PLA after UV irradiation. The obtained results of mechanical properties showed the nanoparticles homogeneously dispersed in the polymer matrix where they initiated the formation of composite nanostructure, to the effect of a significant change in mechanical properties [22]. Regarding the content of PVAc/ZnO microcapsule was more than 0.99 wt%, the mechanical properties of PLA can be improved with or without UV irradiation.…”

“…The obtained results indicated a good miscibility of PVAc/ZnO microcapsule and PLA matrix due to the dispersion on nanolevel. The well-known fact was that in PLA composites [21][22][23], nanostructure simultaneously caused an increase in tensile strength and elongation at break compared with the neat PLA, while the values of the mechanical properties of PLA/ZnO composites indicated a significant deterioration. It was evident that this was the result of the aggregation of ZnO, which was confirmed by SEM micrographs.…”

UV Irradiated Graphene-Based Nanocomposites: Change in the Mechanical Properties by Local HarmoniX Atomic Force Microscopy Detection

“…Preliminary studies are already available in the literature. Epoxy-Graphene (E/G) nanocomposites with different loading of graphene were prepared via in situ pre-polymerization by Alhumade et al [37] The prepolymer/graphene mixture was spin coated on SS304 substrate and after thermal curing was analysed to investigate the effect of graphene on different properties of the coating. The incorporation of graphene was found able to enhance mechanical properties, thermal properties as well as the adhesion of the epoxy composite to the SS304 substrate.…”

Epoxy resin coatings modified by ionic liquid. Study of abrasion resistance

“…Roomtemperature ionic liquids play multiple roles when used as additives of epoxy thermosets [3], ranging from catalysts and curing agents [4] to plasticizers or precursors of conducting [5][6][7] and more sustainable materials [8]. Very recent studies are focusing on the effect of different fillers on the tribological performance of epoxybased bulk materials, coatings and films [9][10][11][12][13][14]. From the point of view of improving the poor tribological performance or epoxy resin, ILs have shown their ability to reduce the brittleness of the bulk epoxy matrix materials, reducing friction coefficients and protecting against wear [15][16][17][18][19][20].…”