石墨烯改性环氧树脂涂层的制备及其性能

为增强传统环氧树脂涂料的耐腐蚀性能,将改性石墨烯与涂料复合,制备了不同石墨烯含量的复合涂层。利用扫描电子显微镜(SEM)、接触角测定仪、显微红外光谱仪、热重分析仪、多功能表面测试仪等表征了添加不同含量石墨烯涂层前后的截面形貌、接触角、耐热性能以及摩擦磨损性能;采用电化学阻抗谱(EIS)、极化曲线研究涂层浸泡在3.5%Na Cl溶液中的电化学行为,并通过中性盐雾试验测试不同石墨烯含量涂层的耐盐雾腐蚀性能。结果表明:当石墨烯添加量为1%时,涂层各方面性能相对最佳。与未添加改性石墨烯涂层相比,改性石墨烯涂层的接触角增加5°,疏水性能增加;平均摩擦因数从0.28降至0.08,耐磨损性能提高;自腐蚀电流减小,自腐蚀电位正移耐腐蚀性能显著增强;1 800 h盐雾试验中1%石墨烯涂料样板未发生明显腐蚀。

Preparation and Properties of Graphene Modified Epoxy Resin Coating

To enhance the corrosion resistance of the traditional epoxy resin coatings, a composite coating with different graphene content was prepared by combining the traditional coating with the modified graphene. The section morphology, contact angle, thermal properties and tribological properties were characterized before and after adding different contents of graphene coating by using scanning electron microscopy (SEM), contact angle measurement, micro infrared spectrometer, thermogravimetric analyzer, multifunctional surface tester. The electrochemical behavior of the coating immersed in 3.5% NaCl solution was studied by using electrochemical impedance spectroscopy (EIS) and polarization curve. The salt fog resistance of the coating with different contents of graphene was tested using the neutral salt spray. When the graphene content is 1%, the coating has the best properties. Compared with the unmodified graphene coating, the contact angle of the modified graphene coating increases by 5 degrees, and the hydrophobic property of the modified graphene coating is improved. The average friction coefficient decreases from 0.28 to 0.08, and the wear resistance is improved. The corrosion resistance of positive shift of self-corrosion potential is significantly enhanced with the decrease of self-corrosion current. In salt spray test for 1 800 h, no obvious corrosion occurs in coating sample with addition of 1% graphene.