Preparation and anti-icing properties of superhydrophobic bionic nanopore structures aluminum surface by anodic oxidation technique

Superhydrophobic bionic surface has received a lot of attention due to its functional protective effect on the substrate, such as its anti-icing effect on transmission lines. Considering the economic and industrial prospects, anodizing technology is being considered to prepare biomimetic honeycomb pore structures to achieve superhydrophobicity and anti-icing performance. In this study, sulfuric acid, oxalic acid, and phosphoric acid electrolytes were compared to prepare porous structures for hydrophobicity. In addition, the bouncing behavior of water droplets was further tested to study the kinematic characteristics of falling water droplets on the substrate and superhydrophobic surface. The results shows that the phosphate anodized nano-porous structure has the largest average pore size (262.2nm) and porosity (40.52%), endowing it with the optimal superhydrophobicity (CA of 153.6° and SA of 8.2°) and ice adhesion strength (10.3kPa). Therefore, the anodized nano-porous structures have good protective effects and application prospects in high voltage field.