A two-step method fabricating a hierarchical leaf-like superamphiphobic PTFE/CuO coating on 6061Al

摘要

Aluminum-based materials are widely used, but they are easily corroded and contaminated in some harsh conditions. Now, fabricating anti-wetting coatings on aluminum-base materials is a promising way to solve the above problems. In this work, a two-step method is developed to fabricate a hierarchical leaf-like superamphiphobic PTFE/CuO coating on 6061Al substrate, and it is simple, economical and environmentally friendly. The resultant coating is repellent to many liquids, such as tap water, ink, tea water, milk, H2SO4 solution (pH 3), NaOH solution (pH 10), ethylene glycol and glycerol. All contact angles of these liquids on the PTFE/CuO coating are more than 150 degrees, and water sliding angles are less than 10 degrees. Importantly, the results of the selfcleaning, adhesion, chemical stability and corrosion resistance tests indicate that the PTFE/CuO coating could protect the 6061Al substrate from corrosion and pollution. Furthermore, after the UV, thermal stability and mechanical stability tests, the PTFE/CuO samples are still be superhydrophobic, which suggests that 6061Al substrate with the PTFE/CuO coating could be applied in harsh conditions. In sum, the method is especially suitable to large-scale industry production and promising for corrosion protection and functional applications of aluminum-based materials.