In the present study, a scalable-manufactured and environmental-friendly method was proposed to fabricate the superhydrophobic coating on titanium alloy. The hierarchical binary surface structures were obtained by hydrothermal treatment of titanium alloy with oxalic acid and sodium hydroxide solutions successively. The hierarchical structure surfaces after fluoroalkyl-silane modification possessed a maximum contact angle of 158.7^∘ and a sliding angle of 4.3^∘. The low contact angle hysteresis surface can lead to efficient self-cleaning performance, which was confirmed by the bounce and roll off of water droplet on the surface. Furthermore, the anticorrosion behaviors of the superhydrophobic coating in 3.5wt.% NaCl solution was evaluated by the electrochemical impedance spectroscopy (EIS). It was found that the superhydrophobic coating can maintain its superhydrophobic state (150^∘) within 48 h, thereby effectively preventing the corrosive medium from penetrating into the coating. This simple yet fast anti-corrosion/self-cleaning superhydrophobic coating manufacturing strategy will enlighten its potential application in the engineering fields.

中文翻译：

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通过简单的化学蚀刻在钛合金上形成超疏水涂层

在本研究中，提出了一种可扩展且环保的方法来制备钛合金上的超疏水涂层。采用草酸和氢氧化钠溶液对钛合金进行水热处理，得到分级二元表面结构。氟烷基硅烷改性后的多级结构表面具有158.7 ^{∘的最大接触角和4.3 ∘}的滑动角。低接触角滞后表面可以导致有效的自清洁性能，这通过表面上水滴的反弹和滚落得到证实。此外，超疏水涂层的防腐行为在 3.5通过电化学阻抗谱 (EIS) 评估 wt.% NaCl 溶液。研究发现，超疏水涂层可以在48 h内保持其超疏水状态（^150∘），从而有效防止腐蚀介质渗入涂层。这种简单而快速的防腐/自清洁超疏水涂层制造策略将启发其在工程领域的潜在应用。