Biomimetic Construction of Robust and Multifunctional-Integrated Superhydrophobic Coatings on Steel Structures via a One-Step Spraying Technique

), and modified ammonium polyphosphate (MAPP). The results showed that a static water contact angle (WCA) of 157.5° and a water sliding angle (WSA) of 5° were achieved by the as-prepared coatings with good water repellency and self-cleaning ability. Most importantly, the minimum backside temperature of the coated steel structures was decreased to 287 °C during the fire impact tests. Compared with neat EP/PDMS, the peak-to-heat release rate (PHRR) and total heat release rate (THR) were significantly reduced to 26.7 and 26.1%, respectively, indicating that the as-prepared coatings possessed excellent passive fire-resistant capacity. The synergistic effect of fillers in the condensed phase occupied a dominant position in promoting high-quality char layers. Surprisingly, coatings with good robustness could be further endowed with adequate corrosion resistance and oil/water separation ability. Therefore, this work provided a viable and effective strategy for tackling the surface functionality problem of materials, which could extend the application scope of superhydrophobic coatings in more fields.