Preparation method for super-hydrophobic aluminum surface

The invention provides a preparation method for the super-hydrophobic aluminum surface. The preparation method comprises the following steps that (1) an aluminum sheet is pretreated, specifically, the aluminum sheet is sequentially placed into a detergent aqueous solution, an ethanol solution and a deionized aqueous solution for ultrasonic wave cleaning, and the aluminum sheet is subjected to electrolytic polishing treatment; (2) anodizing is conducted, specifically, the aluminum sheet is put into a phosphoric acid solution for anodizing and then put into a phosphoric acid solution for pore broadening; and (3) chemical vapor deposition (CVD) evaporation is conducted, specifically, the aluminum sheet is put into parylene coating equipment after being anodized, and even parylene evaporation is achieved by controlling the reaction conditions. According to the novel preparation method for the super-hydrophobic aluminum surface, the anodizing method and the CVD evaporation method are combined. A prepared aluminum surface thin film is good in hydrophobic property, high in stability and good in cold resistance and humidity resistance; the control over the thickness of the coating can be achieved by controlling the input amount of the parylene, and the thin film with the nano-scale thickness is obtained.