Effect of clay on the corrosion inhibition and dynamic mechanical properties of epoxy ester–polyurea–polysiloxane hybrid coatings

Abstract

The corrosion resistance of polymeric coatings containing epoxy ester, polyurea, and polymethylhydrosiloxane was significantly improved by the addition of cloisite 15A organoclay. The weight percent of organoclay was varied from 0.5 to 10%. The presence of organoclay in the coatings was confirmed using the Fourier transformed infrared spectroscopy. The effect of organoclay on the surface energy of the coatings was analyzed by measuring contact angle with a video contact angle analyzer and using water and iodomethane as the probing liquids. The surface energy of the coatings increased with increasing organoclay concentration. The corrosion resistant properties were measured by direct current polarization technique. The addition of organoclay enhanced the corrosion resistance of the coatings, and the best corrosion resistance was shown by coating containing 1% organoclay. The dynamic mechanical property of the coatings was determined using the dynamic mechanical spectrometer. The glass transition temperature of the films decreased significantly with the addition of organoclay up to 1% after which it increased with additional increase in the wt% of organoclay.

Effects of organically modified nanoclay particles on the mechanical properties of aliphatic polyurethane/clay nanocomposite coatings

“…Hence, significance of enhancing the mechanical and environmental properties of polyurethane is out of question. Recently, using nanoparticles such as silica, TiO 2 , and clay became a new way for reinforcement and improving the coating properties . Sabzi showed that the presence of modified nano TiO 2 particles in the polyurethane coating can improve the mechanical properties significantly .…”

In Situ Synthesis of Reduced Graphene Oxide‐Reinforced Silicone‐Acrylate Resin Composite Films Applied in Erosion Resistance

“…Although only a small proportion of rGO was incorporated into the silicone-acrylate resin film, high corrosion protection was afforded. By comparison with that of siliconeacrylate resin film in the previous works [11,24,25], the corresponding corr of rGO/silicone-acrylate resin composite film was smaller. The good corrosion resistance may be attributed to the following two reasons: (1) silicone-acrylate resin could act as a physical barrier coating and (2) the welldispersed rGO embedded in silicone-acrylate resin matrix could prevent corrosion owing to a relatively higher aspect ratio than clay platelets, which enhances the oxygen barrier property of rGO/silicone-acrylate resin composite film [10,25].…”