The Praperation And Wettabillity Of Micro-Nano Multi-Scale Structure ZnO/AAO Composite Film On Aluminum

Super-hydrophobic/super-amphiphobic materials can effectively reduce the contact between the liquid medium and the solid surface,are effective in improving the oil resistance and corrosion resistance and expanding their applications in self-cleaning fields of metal materials such as aluminum and aluminum alloys.The rough structure surface morphology is one of the most important factors influencing wettability.The present work is based on the characteristics and existing problems of the super-amphiphobic material.It does not use any fluorine-containing low surface energy material to modify,only through construct the surface of the rough composite film with micro-nano multi-scale structure by anodization combined with hydrothermal technologyto achieve super-double sparseness on the metal surface.Then,the growth mechanism of the metal surface composite film is studied,and the controllable preparation of the surface micro-nano multi-scale structure composite film and the effect of surface microstructure on its wettability are investigated.This work first explores the key technologies of anodization and hydrothermal reaction in the preparation of micro-nano multi-scale structure composite films.On this basis,ZnO/AAO micro-nano multi-scale structure composite film is prepared by growing sheet-like nano-ZnO on the anodic aluminum oxide(AAO)base film by the hydrothermal reaction method.Based on the results of XRD,EDS,SEM and TEM,the growth mechanism of layered ZnO on the AAO base film was analyzed.The morphological characteristics and growth control of the multi-scale micro-nano structure constructed by the ZnO/AAO composite film were studied by changing the morphology of the AAO base layer and the hydrothermal reaction time,and its wettability was studied.The surface wettability of the film before and after the growth of ZnO changed from super-hydrophilic to super-hydrophobic,and the wettability was significantly different.The difference of the micro-nano multi-scale structure on the surface of the ZnO/AAO composite film makes the surface wettability different due to the different actual contact ratio of droplets,and the wettability of droplets with different surface tension,such as water,glycerol,glycol and sesame oil,is also different.Finally,when the long-fiber-covered porous AAO base film is hydrothermally reacted for 0.5 h,the contact angles of the ZnO/AAO composite film to water and glycerol are 160° and 158°,respectively.A super-hydrophobic/super-amphiphobic micro-nano multi-scale structure surface on the metal aluminum substrate with good mechanical durability is built by anodizing technology and hydrothermal reaction,and does not use toxic,harmful,high-cost fluorine-containing low surface energy materials as coatings to reduce surface energys,simplify the surface processing process,and its mechanical durability is good.