Fabrication of Super-hydrophobic Surfaces on Aluminum Alloy by Chemical Etching Method

A simple chemical etching method was developed for corrosion of aluminum alloy substrate,After the chemical etched surface was treated with fluorination,the aluminum alloy surface exhibits a super-hydrophobic property,The effects of the etching time and the etchant concentration on the super-hydrophobicity were investigated,the result show the contact angle of hydrofluoric firstly increases then reduce with acid etching time increasing,and the optimum etching time is 7 min;the contact angle of hydrofluoric firstly increases then reduce with acid etchant concentration increasing,and the optimum etchant concentration is 4 mol /L.