目的 研究 Al₂O₃ 纳米粒子环氧复合涂层对钢筋的防护性能。 方法 制备 Al₂O₃ 纳米粒子,将其添加至环氧涂料中,并涂覆在工业钢筋表面成膜。 通过 XRD 和 SEM 对 Al₂O₃ 进行表征;利用电化学噪声、交流阻抗谱分析技术,对复合涂层在 3 . 5% ( 质量分数) NaCl 介质中对工业钢筋的防护性能进行测试分析。 结果 制备的氧化铝纳米粒子的粒径平均为 75 nm。 通过对电化学噪声测试的有效数据进行时域和频域分析,通过交流阻抗谱分析及数据拟合,认为 Al₂O₃ 纳米粒子添加量为 0 . 1% ( 以占环氧树脂质量的百分比计) 时,涂层对钢筋的防护性能最好。 结论 向环氧涂层中添加适量的 Al₂O₃ 纳米粒子,可以明显提升其对钢筋的防护性能。

Objective To study the protective performance of Al₂O₃ nanoparticles epoxy composite coating of steel. Methods The Al₂O₃ nanoparticles were prepared, and then added into the epoxy coating, coated on the steel as a film. The Al₂O₃ nanoparticles were characterized by XRD and SEM. The anti-corrosive properties of the composite coatings in the solution of 3. 5% NaCl were evaluated by electrochemical noise and electrochemical impedance spectroscopy. Results The average size of Al₂O₃ nanoparticles was 75 nm. Based on the time and frequency domains analysis of electrochemical noise data, the analysis of electrochemical impedance spectroscopy and data fitting, it was found that the composite coating with 0. 1% Al₂O₃ nanoparticles ( as a percentage in the weight of epoxy resin) had the best protective performance on steel. Conclusion The epoxy coating supplemented with a suitable amount of Al₂O₃nanoparticles showed significantly improved protective performance on steel.