Fabrication of the pod-like KCC-1/TiO2 superhydrophobic surface on AZ31 Mg alloy with stability and photocatalytic property

It has been broadly studied to ensure the protection of magnesium alloy by superhydrophobic surface. In this work, the layered TiO2 was prepared in response to the AZ31 Mg alloy by hydrothermal method and loaded wrinkled silicon dioxide (KCC-1) on the layer by electrostatic self-assembly to build a pod-like structure. After modification by stearic acid, the surface shows superhydrophobicity. The morphology, structure and composition of the surface were characterized by scanning electron microscope (SEM), the X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The anticorrosive effect of the superhydrophobic surface was investigated by detecting the electrochemical impedance spectroscopy and polarization curves in 3.5 wt% NaCl solution for a week. Superhydrophobic surfaces also exhibited chemical stability, physical stability and ultraviolet light tolerance. In addition, the TiO2 containing in the film had a certain photocatalytic performance on decomposition of organic contaminants. Combining the self-cleaning property, the surface showed excellent adaptability to the outdoor environment.