A novel approach to the robust Ti6Al4V-based superhydrophobic surface with crater-like structure

The fabrication of Ti6A4V-based superhydrophobic surface with crater-like structure using sandblasted coating of SiO₂, was investigated. A Ti6A4V alloy block was ultrasonically cleaned in alcohol and deionized water baths, respectively. After drying, the block was sandblasted a coating of silica particles under the pressure of about 0.5 MPa for around 20 s. Then, the sandblasted substrate was immersed in an aqueous solution of hydrofluoric acid to remove silica particles, forming an appropriate roughness surface. The chemical states of elements distributed on the superhydrophobic surfaces, surface hardness of samples was analyzed using a PHI-multi-functional X-ray photoelectron spectroscope operating with Mg-Ka irradiation. It was observed large amounts of nano-nicks were formed in the wall of crater due to friction between silica particle and substrate. Result shows that Ti6A4V-based superhydrophobic surface can be used as anti-corrosion and anti-wear material.