We report a simple method for fabricating micro-nanoscale structures consisting of irregular microscale plateaus with a self-assembled network of zinc oxide nanopetals on an aluminum alloy substrate. The method involves a combination of chemical etching with a hydrothermal process, followed by Polydimethylsiloxane coating via a simple vapor deposition method. Following the coating, surface displays superhydrophobicity with water contact angle of 161° and a sliding angle of 4°. The effect of morphological changes on wettability is examined by varying the hydrothermal processing time. The chemical stability of the superhydrophobic surfaces is examined in a wide range of corrosive media. After being immersed in a 3.5 wt% NaCl solution for 1 month, the surface retained its superhydrophobicity. The potentiodynamic polarization test results reveal that the superhydrophobic surface highly improves the corrosion resistance performance of the bare aluminum surface by three orders of magnitude. In addition, surface exhibited good mechanical durability against sandpaper abrasion, and long-term stability in the ambient environment. The proposed fabrication technique operating at relatively low temperature is simple and provides a new approach for production of large-scale three-dimensional superhydrophobic surfaces for various applications.

中文翻译：

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具有增强的耐腐蚀性能的坚固且化学稳定的超疏水铝合金表面

我们报告了一种简单的方法来制造微纳米结构，该结构由不规则的微平台组成，具有在铝合金基板上的氧化锌纳米花瓣的自组装网络。该方法包括将化学蚀刻与水热工艺相结合，然后通过简单的气相沉积方法涂覆聚二甲基硅氧烷。涂覆后，表面显示出超疏水性，水接触角为161°，滑动角为4°。通过改变水热处理时间来检查形态变化对润湿性的影响。在广泛的腐蚀性介质中检查了超疏水表面的化学稳定性。将其浸入3.5 wt％的NaCl溶液中1个月后，表面保持其超疏水性。电位动力学极化试验结果表明，超疏水表面将裸铝表面的耐腐蚀性提高了三个数量级。另外，表面表现出良好的抗砂纸磨损的机械耐久性，以及在周围环境中的长期稳定性。所提出的在相对较低的温度下操作的制造技术是简单的，并且为用于各种应用的大规模三维超疏水表面的生产提供了新的方法。