Study of Super Hydrophobic Films on Pre-Sensitized Plate Aluminium Substrate

A simple chemical etching method was developed for corrosion of the pre-sensitized plate aluminium substrate in order to be a rough surface. After the chemical etched surface was treated with fluorination, the pre-sensitized (PS) plate aluminium (Al) substrate surface exhibits a super-hydrophobic property. The effects of the etching time and the etchant concentration on the super-hydrophobici were investigated, and the results show the contact angle of hydrofluoric firstly increases then reduce with acid etching time increasing, and the optimum etching time is 12 min; the contact angle of hydrofluoric firstly increases then reduce with acid etchant concentration increasing, and the optimum etchant concentration is 3 mol /L. When the contact angle increases, the droplet and solid surface tension increases. Film base fine structure of the rough surface is the key to the formation of hydrophobic.