Endowing durable icephobicity by combination of a rough powder coating and a superamphiphobic coating

An anti-icing coating with good mechanical stability and a multi-stage structure was prepared using electrostatic powder spraying and solution spraying to solve the abrasion resistance of superhydrophobic coatings. The prepared coating has excellent superamphiphobic and anti-icing performances due to selectivity properties on the matrix resin without any influence, and the surface has the characteristics of large roughness and low surface energy. The formation of the superamphiphobic structure's hierarchy of the surface is attributed to the change of rheological mechanism caused by modified SiO2 nanoparticles, hindering the powder coatings from leveling during the solidification process. The surface roughness of the coating can be varied to change the ice's desorption ability by varying the amount of modified nano-SiO2. The initial ice adhesion strength of the coating is 89.6 kPa, and the coating can delay icing for 4436 s at –15 ℃. The coating's abrasion resistance is enhanced by the network crosslinking structure between the resin and SiO2 nanoparticles and the addition of modified SiO2 nanoparticles. The coating can still maintain superamphiphobic property at 1000 g load, using 1000 abrasion cycles, 100 m sandpaper grinding and 450 min sand erosion at 20 m/s. The ice adhesion strength of the coating is reduced to 18.7 kPa due to the decreased ice nailing effect, and the icing delay is 2596 s. Furthermore, the coating has excellent self-cleaning, electrochemically corrosion-resistant, and salt solution immersion ability. This superamphiphobic coating with high mechanical stability has a wide range of outdoor applications and is expected to be used to develop environmentally friendly anti-icing/de-icing coatings.