Nanocomposite Coating Based on Thermoplastic Acrylic Resin and Montmorillonite Clay: Preparation and Corrosion Prevention Properties

Different amounts of nanoclay were incorporated into the acrylic resin matrix at 0, 1, 3, and 5 wt.%loadings. The coatings were applied on low carbon steel plates. Optical microscopy, sedimentationtest, transmission electron microscopy, and X-ray diffraction were employed to investigate thedispersion of nanoclay in matrix. The corrosion resistance of coatings was evaluated byelectrochemical impedance spectroscopy, polarization measurement, and salt spray test. In addition,pull-off and cross-cut tests were used for the assessment of coating adhesion to the substrate. Theresults indicated that the anti-corrosive properties of the acrylic resin were obviously increased bythe addition of nanoclay. The nanocomposite coatings containing 3 wt.% clay showed the bestcorrosion resistance. Finally, the nanocomposites containing 1 and 3 wt.% showed the highestadhesion to the substrate.

Keywords:

Nanocomposite Coating , Montmorillonite , Corrosion , Impedance , Salt spray