抗腐蚀、超疏热水的无氟超疏水涂层

超疏水材料由于其独特的界面功能，具有广泛的应用前景。然而，目前大多数超疏水表面都是使用含氟化学试剂设计和制造的。此外，表面张力较低的高温水滴容易钉住表面，导致界面性能失效。为了克服这些缺陷，本文以聚二甲基硅氧烷(PDMS)和十六烷基三甲氧基硅烷改性氧化铝纳米粒子(Al2O3@HDTMS)为基础，在Q235碳钢表面制备了超疏水双层涂层。利用场发射扫描电镜(FE-SEM)、能谱(EDS)、x射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、接触角计和电化学阻抗谱(EIS)等技术对构建的超疏水双层涂层进行表征。结果表明，该超疏水双层涂层对各种固体和液体污染物具有不润湿、防污和自清洁能力。该超疏水双层涂层具有优异的耐腐蚀和耐候性，涂层|Z|0.01Hz, Rct值提高了8个数量级以上，可承受720 h的加速盐雾和50 d的室外大气腐蚀。此外，超疏水双层涂层在宽温度范围内(30 ~ 90°C)具有对水滴的超拒水性，并且具有高的机械稳定性，可以抵抗连续砂纸磨损和胶带剥离循环。

Superhydrophobic materials possess broad application prospects due to their unique interfacial functions. However, most current superhydrophobic surfaces are designed and fabricated using fluorine-containing chemical reagents. In addition, high-temperature water droplets with low surface tension tend to pin on the substrate, resulting in the failure of interfacial performance. To overcome these drawbacks, this study prepared a superhydrophobic double-layer coating on Q235 carbon steel surfaces using polydimethylsiloxane (PDMS) and hexadecyltrimethoxysilane-modified alumina nanoparticles (Al₂O₃@HDTMS) as raw materials. The as-prepared superhydrophobic double-layer coating was characterized via multiple techniques including field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), contact angle goniometer, and electrochemical impedance spectroscopy (EIS). The results show that the superhydrophobic double-layer coating exhibits non-wetting, antifouling and self-cleaning capabilities against various solid and liquid contaminants. This coating features excellent corrosion resistance and weatherability: the impedance modulus |Z| at 0.01 Hz and charge transfer resistance Rct values increased by more than 8 orders of magnitude, and it can withstand 720 h of accelerated salt spray exposure and 50 days of outdoor atmospheric corrosion. Furthermore, the superhydrophobic double-layer coating maintains ultra-high water repellency towards water droplets over a wide temperature range (30–90 °C), and has high mechanical stability, capable of resisting continuous sandpaper abrasion and tape peeling cycles.