Abstract We proposed a novel superhydrophobic fabrication method based on ultrasonic cavitation. The collapse of cavitation bubbles eroded the surface to form a microstructure with high roughness. SiO2 nanoparticles were then effectively anchored on the surface using cavitation jets to form a micro-nano composite structure. The superhydrophobic performance was evaluated on the basis of the water contact angle (WCA). The proposed method achieved robust superhydrophobic property, and the WCA of copper, brass and 304 stainless steel substrates exceeded 153.3°. The morphology and composition of the superhydrophobic surfaces were characterized using scanning electron microscopes and Fourier transform infrared, respectively. Results revealed that the SiO2 particles were uniformly dispersed, and a flaw-free state was obtained by the surface. The samples exhibited excellent anti-corrosive durability during ultraviolet and outdoor testing and immersion in different corrosive solutions. The cavity generated by the cavitation erosion can be used as a container to suppress the loss of effective components. The micro-nano double layer structure was retained, and the WCA can be restored to the original level through functionalization again to give low surface energy. The prepared superhydrophobic surface was repairable. In addition, the WCAs of the copper foam and sponge were 157.0° and 159.6°, respectively.

中文翻译：

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超声空化制备具有微纳米结构的可修复防腐超疏水表面

摘要 我们提出了一种基于超声空化的新型超疏水制造方法。空化气泡的崩溃侵蚀了表面，形成了具有高粗糙度的微观结构。然后使用空化射流将 SiO2 纳米粒子有效锚定在表面上，形成微纳米复合结构。基于水接触角（WCA）评估超疏水性能。该方法实现了强大的超疏水性能，铜、黄铜和 304 不锈钢基材的 WCA 超过 153.3°。分别使用扫描电子显微镜和傅里叶变换红外光谱表征超疏水表面的形态和组成。结果表明，SiO2 颗粒均匀分散，表面获得无裂纹状态。样品在紫外线和户外测试以及浸泡在不同腐蚀性溶液中时表现出优异的耐腐蚀性能。空蚀产生的空腔可作为抑制有效成分损失的容器。保留了微纳双层结构，通过再次功能化，WCA可以恢复到原来的水平，以提供低表面能。制备的超疏水表面是可修复的。此外，泡沫铜和海绵的 WCA 分别为 157.0°和 159.6°。保留了微纳双层结构，通过再次功能化，WCA可以恢复到原来的水平，以提供低表面能。制备的超疏水表面是可修复的。此外，泡沫铜和海绵的 WCA 分别为 157.0°和 159.6°。保留了微纳双层结构，通过再次功能化，WCA可以恢复到原来的水平，以提供低表面能。制备的超疏水表面是可修复的。此外，泡沫铜和海绵的 WCA 分别为 157.0°和 159.6°。