Controlling Superhydrophobicity of Aluminum with Hierarchical Micro‐Nanostructure Film for Superb Self‐Cleaning and Anti‐Corrosion

The superhydrophobic protective film on Al substrate was fabricated by modifying stearic acid on hierarchical micro-nanostructure CuO film. The static water contact angle reached up to 163° by coating CuO/STA film on Al substrate, and the rolling-off angle was as low as 3.7°. CuO/STA protective film coated Al substrate displayed wonderful non-sticking performance when the free-falling water droplets contact the surface. Superb anti-corrosion properties of Al were achieved by coating superhydrophobic CuO/STA film on Al.