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通过低温水热法制备了纳米TiO2,并采用X射线衍射仪(XRD)和透射电子显微镜(TEM)对其进行了表征。采用共混法以TiO2对环氧树脂进行改性,在碳钢基体上制备了TiO2改性环氧树脂涂层。利用交流阻抗技术(EIS)研究了纳米TiO2改性环氧树脂涂层/碳钢体系在海水中的电化学行为。结果表明,浸泡2 7 d,涂层电阻Rc变化不大;浸泡7 14 d,Rc从586.3 M/cm2逐渐减至426.6M/cm2;在浸泡中期(17 28 d),Rc从18.2 M/cm2减小到10.2 M/cm2,碳钢腐蚀反应的电荷转移电阻Rct从81.9 M/cm2逐渐降低到57.2 M/cm2,说明涂层的物理防护性能逐渐减弱,碳钢基体的耐蚀性能在海水侵蚀下逐渐降低;在浸泡后期(42 60 d),Rct从22.9 M/cm2降低到2.84 M/cm2,涂层基本失效。
Nanometer TiO2 was prepared by low temperature hydrothermal method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The blend method was used to modify the epoxy resin with TiO2, and the TiO2 modified epoxy resin coating was prepared on the carbon steel substrate. The electrochemical impedance spectroscopy (EIS) was used to study the electrochemical behavior of nano-TiO2 modified epoxy resin coating / carbon steel in seawater. The results showed that Rc did not change much after 27 days of immersion. The Rc decreased gradually from 586.3 M / cm2 to 426.6M / cm2 after 714 d of immersion. From 18.2 M / cm2 To 10.2 M / cm2. The Rct of the corrosion reaction of carbon steel decreased gradually from 81.9 M / cm2 to 57.2 M / cm2, indicating that the physical protective properties of the coating gradually weakened and the corrosion resistance of the carbon steel matrix was deteriorated in seawater And decreased gradually from 22.9 M / cm2 to 2.84 M / cm2 at the late stage of soaking (42-60 days). The coating basically failed.