Anticorrosive epoxy coatings based on polydopamine modified molybdenum disulfide

Introducing inorganic layered nanomaterials into polymer arrays is one of the important methods to improve the anti-corrosion performance of epoxy coatings, but the compatibility between them is the first problem to be solved. In this study, lamellar molybdenum disulfide (MoS2) is modified by polydopamine (PDA) to improve its dispersibility and anti-corrosion properties in epoxy resin coatings. PDA is firstly coated onto the surface of MoS2 successfully, which can be proved by FT-IR, Raman and SEM. Then, the PDA modified MoS2 (MoS2 @ PDA) is introduced into epoxy resin system to prepare a new epoxy resin coatings (MoS2 @ PDA/EP). The anticorrosive performance of EP (pure epoxy coatings), MoS2/EP and MoS2 @ PDA /EP coatings are evaluated by electrochemical impedance spectroscopy spectra (EIS), polarization curve and pull-off adhesion tests. Compared to EP coating, the corrosion resistance of MoS2 @ PDA/EP coating has increased nearby three orders amount and the adhesion strength of MoS2 @ PDA/EP coating has increased nearby 3 Mpa. So, polydopamine modified MoS2 (MoS2 @ PDA) is an effective nanocomposite for preparing high-peroformane anticorrosion epoxy coatings.