A multifunctional super-hydrophobic coating based on PDA modified MoS 2 with anti-corrosion and wear resistance

Abstract

A multifunctional super-hydrophobic polyethersulfone (PES)/1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS)/MoS 2 –polydopamine (PDA)–TiO 2 coating was fabricated by a simple spraying method that involved two consecutive steps of dopamine (DA) self-polymerization on MoS 2 sheet surface and in situ growth of TiO 2 nano-particles. The coating possessed super-hydrophobicity with the water contact angle (WCA) of 159 ± 2° and excellent self-cleaning property. Remarkable mechanical stability was obtained with original super-hydrophobicity even after 10,000 abrasion cycles of damage under the load of 50 KPa. It also retained high WCA of 150° after exposure to strong acids (HCl, pH = 1) and bases (NaOH, pH = 14) for at least 30 h. Compared with the uncoated aluminum substrate, the corrosion resistance of the coating was significantly enhanced with lower corrosion current density of 2.7 × 10 −9 A/cm 2 and higher corrosion potential of −41 mV after immersion in a 3.5 wt% NaCl solution for 15 days. All these results suggest the super-hydrophobic PES/POTS/MoS 2 –PDA–TiO 2 coating exhibits great potential as a functional surface in a wide range of practical applications.