Durable and Superhydrophobic Aluminium Alloy with Microscale Hierarchical Structures and Anti-Drag Function Inspired by Diving Bell Spider

Coating materials with special surface wettability are widely applied in marine paint systems used the naval industry to reduce corrosion and viscous drag of seawater. However, traditional coatings inefficient limited, either by poor durability or insufficient anti-drag capacity. Here, inspired diving bell spider, a bionic superhydrophobic coating multiscale hierarchical architecture was successfully prepared on aluminium alloy. It possesses excellent mechanical abrasion durability, chemical low adhesion. Remarkably, water contact angles could remain over 150.9° after more than 15 cycles strong acid/alkali conditions. In addition, impacting droplet lifted off alloy (BSAA) within 13 ms, illustrating an adhesion property. fact, when BSAA is immersed water, it absorb bubbles form gas membrane. The existence membrane prevent anaerobic organisms from contacting even corroding BSAA. Meanwhile, acts as lubricant significantly deceases friction at solid–liquid interface, reducing for proposed this work has broad application prospects, such medical devices, microfluidic chips, separation collection water.