Totally Waterborne and Highly Durable Superamphiphobic Coatings for Anti-Icing and Anticorrosion

Bioinspired superamphiphobic coatings have garnered significant interests and great achievements are achieved; however, it is still difficult to move them to practical applications because of their pollutive preparation methods and poor stability. Here, preparation of totally waterborne and highly durable superamphiphobic coatings is reported by spray-coating adhesive layers and a homogeneous suspension formed by hydrolytic condensation of silanes with SiO2 nanoparticles in water. The surface structure and chemical composition, superamphiphobicity, mechanical and chemical stability, anti-icing and anticorrosion performances are studied by various analytical techniques and methods. The coatings feature i) a unique three-tier macro/micro/nanostructure, ii) high contact angles and low sliding angles for not only various room temperature liquids but also hot liquids up to 92 degrees C, iii) high mechanical stability against intensive sandpaper abrasion, tape-peeling, and water jetting, and iv) exceptional long-term chemical stability even in aqua regia, saturated NaOH and boiling water. Furthermore, the coatings on Mg alloy show excellent anti-icing performance in actual outdoor environment and excellent anticorrosion performance in salt spray test. The waterborne and highly durable superamphiphobic coatings may be used in various fields, as the coatings with high repellency even to hot liquids can be applied onto various substrates.