A superhydrophobic ZnAl–layered double hydroxide (LDH)–La film was prepared by a hydrothermal method and further modification by laurate anions in this work. Comprehensive characterizations of this film were performed in terms of morphology, composition, structure, roughness, and wettability by scanning electronic microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, three-dimensional laser scanning confocal microscopy. The long-term corrosion protection effect of this superhydrophobic film was investigated deeply by monitoring the changes of the electrochemical impedance spectra for a long time of up to a month in 3.5 wt % NaCl solution. In the meantime, the changes of the contact angle were also recorded with the evolution of the immersion time. The result indicated that the stable superhydrophobic ZnAl–LDH–La film was able to provide efficient protection for the underlying Al substrate for a long time. In addition, the capability of the superhydrophobic surface against harsh conditions, including chemical damages and physical damages, was emphatically investigated. It was found that the superhydrophobic surface was chemically stable toward acid (pH ≥ 3), alkali, and heating, and it also exhibited high ultraviolet (UV) radiation resistance. This superhydrophobic coating maintained superhydrophobicity for 7 days of radiation in an UV chamber equipped with a 40 W UV lamp (λ = 254 nm), indicating superior ability of adapting to outdoor environment. This comprehensive investigation of the superhydrophobic ZnAl–LDH–La film is considerably helpful for researchers and engineers to get deep insight into its potential for practical applications in the field of corrosion and protection.

中文翻译：

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在铝基板上具有长期稳定性的超疏水层状双氢氧化物膜的增强的耐腐蚀性

通过水热法制备了超疏水性ZnAl层状双氢氧化物（LDH）-La膜，并在这项工作中通过月桂酸根阴离子进行了进一步修饰。通过扫描电子显微镜，能量色散X射线光谱，X射线衍射，三维激光扫描共聚焦显微镜对薄膜的形态，组成，结构，粗糙度和润湿性进行了全面的表征。通过监测在3.5 wt％NaCl溶液中长达一个月的长时间的电化学阻抗谱的变化，对该超疏水膜的长期腐蚀保护作用进行了深入研究。同时，随着浸没时间的变化，还记录了接触角的变化。结果表明，稳定的超疏水性ZnAl–LDH–La膜能够长时间为下面的Al基材提供有效的保护。另外，着重研究了超疏水表面在恶劣条件下的能力，包括化学损伤和物理损伤。发现超疏水表面对酸（pH≥3），碱和加热具有化学稳定性，并且还表现出高的抗紫外线辐射性。这种超疏水涂层在配备40 W紫外灯（λ= 254 nm）的紫外室中保持7天的超疏水性，表明其具有出色的适应室外环境的能力。