超疏水表面改善铝基材料的抗海水腐蚀性能

Corrosion Resistance Improvement of Aluminum in Seawater by Super-hydrophobic Surfaces

通过聚乙烯亚胺与十四酸的反应,在铝表面构建稳定的超疏水膜。以X射线衍射,原子力显微镜,扫描电镜,接触角测量仪等手段表征超疏水表面的形成机制与表面结构特征,并利用电化学阻抗方法研究了超疏水表面对铝在海水中的腐蚀行为的影响。结果表明,在铝表面形成了一层近似珊瑚状的超疏水膜,海水的接触角大于150°。通过电化学阻抗图谱测试空白样与试样的耐腐蚀性能,表明这种特殊的表面结构的超疏水膜的确降低了铝在海水中的腐蚀速率。

Pretreated by Polyethyleneimine and n-tetradecanoic acid adsorption, the super-hydrophobic film was formed on the fresh aluminum surface. The film structure was characterized with contact angle measurement, XRD, atom force microscope（AFM） and SEM. The results suggest that the structure of the film is similar to coral and the seawater contact angle is larger than 150°. Moreover, the corrosion resistance of bare and modified samples in seawater were investigated by electrochemical impedance spectroscopy （EIS）. Experimental results show that the corrosion rate of Al with super-hydrophobic surface decreases dramatically because of its special microstrueture.