Abstract:A series of Mn₂O₃/polyaniline with different mass ratios is successfully prepared by blending the porous Mn₂O₃ prepared by solvothermal method with polyaniline prepared by chemical oxidation,and the composite coatings are prepared by coating the materials to the surface of Q235 carbon steel.The surface morphology and structure of the materials are characterized by scanning electron microscopy(SEM),atomic force microscope(AFM) and X-ray diffraction(XRD) and Fourier-transform infrared spectroscopy(FTIR),and the anticorrosive performance of the composite coatings immersed in 3.5wt.%NaCl is investigated by potentiodynamic polarization and electrochemical impedance.The experimental results show that when the mass ratio of Mn₂O₃ is 10% in the composite materials,it is showed the best anticorrosive performance.Compared with the Q235 carbon steel,its corrosion potential has a positive shift for about 380 mV.Morever,its corrosion electric current is decreased approximately three orders of magnitude after 7 days,showing a good stability and anticorrosive performance after 37 days.