Mn_2O_3/PANI的制备及其防腐性能研究

采用溶剂热法制备Mn_2O_3微球,与化学氧化法制备的聚苯胺按不同比例混合,制得Mn_2O_3/PANI,将其涂覆于Q235碳钢表面制备复合涂层.采用扫描电镜(SEM)、原子力显微镜(AFM)、X射线衍射(XRD)和红外光谱(FTIR)表征Mn_2O_3/PANI的表面形貌和结构,利用动电位极化和电化学阻抗谱研究复合涂层的耐蚀性能.结果表明,当Mn_2O_3在复合材料中的质量分数为10%时,防腐性能最优.在3.5%NaCl溶液中浸泡7天后,相较于Q235裸钢,其自腐蚀电位正移约380 mV,自腐蚀电流密度降低约3个数量级;浸泡37天后,其仍有良好的稳定性和耐蚀性.

Preparation of Mn2O3/PANI and Its Anticorrosive Performance

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.