A robust anticorrosive coating derived from superhydrophobic, superoleophobic, and antibacterial SiO2@POS/N+ composite materials

Traditional coatings are easily susceptible by the contamination of organic pollutants and parasitism of bacterium, resulting in severe corrosion damage to the protected substrates. The coating with superhydrophobic, superoleophobic and antibacterial properties would not only spontaneously form an air layer when it is immersed into corrosive medium and effectively obstruct corrosive medium to devastate metal matrix, but also be beneficial to improve the coating's anti-fouling performance along with its antibacterial functionality. However, traditional anticorrosive methods are problematic with low anticorrosion efficiency and single function. Herein, a robust anticorrosive coating stemmed from superhydrophobic, superoleophobic, and antibacterial SiO2 @POS/N+5 composite was prepared by sol-gel and spray method, with water contact angle and water sliding angle up to 160.8 ± 3.1° and 3.0° and oil contact angle and oil sliding angle up to 152.5 ± 3.0° and 3.0° were achieved, respectively. The SiO2@POS/N+5 coating has excellent protection performance (99.98 %), mechanical properties and corrosion durability (21 d). Notably, the SiO2@POS/N+5 composite material has excellent antibacterial effect against Staphylococcus aureus (S. aureus) (100 %) as well. The superamphiphobic coating proposed in this study affords a feasible strategy for bacterial contamination of metal surfaces in marine industries