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7-14d,Rc从586.3 MΩ/cm2逐渐减至426.6 MΩ/cm2;在浸泡中期(17-28 d),Rc从18.2 MΩ/cm2减小到10.2 MΩ/cm2,碳钢腐蚀反应的电荷转移电阻Rct从81.9 MΩ/cm2逐渐降低到57.2 MΩ/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 MΩ/cm2降低到2.84 MΩ/cm2,涂层基本失效.
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