Abstract This work focuses on the structure, wettability and corrosion behaviors of Ti-6Al-4 V alloy after roughening treatments in different concentrations of NaOH aqueous solutions followed by low surface energy hexadecyltrimethoxysilane (HDTMS) coating. In this regard, scanning electron microscopy, contact angle measurements, potentiodynamic polarization and electrochemical impedance spectroscopy were used to characterize the samples. In contrast to hydrophilicity caused by the hydrothermal alkaline treatments, the subsequent HDTMS coating donated considerable hydrophobicity. Typically, the highest sessile water contact angle (about 147°) was obtained for the sample treated in 3 M NaOH solution followed by the HDTMS coating. In addition, the alkaline treatment reduced the corrosion resistance of the surface in a NaCl aqueous solution; however, the HDTMS hydrophobization process improved it significantly. It is eventually concluded that the coupled use of alkaline treatment and HDTMS functionalization can be further considered for moisture-exposed applications of Ti-based alloys.

中文翻译：

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用于疏水化和腐蚀保护的钛合金上有机硅烷功能化的水热衍生涂层

摘要 本工作重点研究了 Ti-6Al-4 V 合金在不同浓度的 NaOH 水溶液中粗化处理和低表面能十六烷基三甲氧基硅烷 (HDTMS) 涂层后的结构、润湿性和腐蚀行为。在这方面，使用扫描电子显微镜、接触角测量、动电位极化和电化学阻抗谱来表征样品。与水热碱处理引起的亲水性相反，随后的 HDTMS 涂层提供了相当大的疏水性。通常，对于在 3 M NaOH 溶液中处理的样品，然后是 HDTMS 涂层，获得了最高的固着水接触角（约 147°）。此外，碱处理降低了表面在NaCl水溶液中的耐腐蚀性；然而，HDTMS 疏水化过程显着改善了它。最终得出结论，碱处理和 HDTMS 功能化的结合使用可以进一步考虑用于 Ti 基合金的湿气暴露应用。