Abstract In this study, Al2O3-13% TiO2 coating was deposited on the AISI 316 L stainless steel substrate by a plasma spraying process (APS). Then, a thin layer of Polytetrafluoroethylene (PTFE) emulsion was coated on the created coating. The morphology and chemical analysis of the coating surface were studied with Field Emission Scanning Electron Microscopy (FESEM) and Attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR). The water contact angles on the prepared samples were measured by a water contact angle analyzer method. The self-cleaning behavior of the samples was evaluated by an iron oxide powder. The fouling test was performed by simulating the fouling conditions. Electrochemical impedance spectroscopy (EIS) and salt spray test were performed to evaluate the corrosion resistance of the coatings. The results showed that the water contact angle of the Al2O3-13% TiO2 coating surface was 56° and for PTFE modified Al2O3-13% TiO2 coating was 155° The size of the teflon particles in the coating is 200–800 nm. Also, the results of the fouling test showed that after 90 days, no fouling was formed on the surface of the PTFE modified coating. EIS results indicated that the PTFE coating due to its higher capacitance had higher corrosion resistance than Al2O3-TiO2 coating. After salt spray test, the contact angles on the PTFE and Al2O3- TiO2 coatings were 47° and 150°, respectively. Therefore, the modified coating has higher corrosion resistance than Al2O3-13% TiO2 coating.

中文翻译：

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超疏水微纳米结构Al2O3-13% TiO2/PTFE 涂层的制备及防污自清洁性能

摘要 本研究采用等离子喷涂工艺 (APS) 在 AISI 316 L 不锈钢基材上沉积了 Al2O3-13% TiO2 涂层。然后，在创建的涂层上涂覆一层薄薄的聚四氟乙烯 (PTFE) 乳液。用场发射扫描电子显微镜（FESEM）和衰减全反射傅里叶变换红外光谱（ATR-FTIR）研究了涂层表面的形貌和化学分析。通过水接触角分析仪方法测量制备的样品上的水接触角。通过氧化铁粉末评估样品的自清洁行为。污垢测试是通过模拟污垢条件进行的。进行电化学阻抗谱（EIS）和盐雾试验以评估涂层的耐腐蚀性。结果表明，Al2O3-13% TiO2 涂层表面的水接触角为 56°，PTFE 改性的 Al2O3-13% TiO2 涂层表面的水接触角为 155°。涂层中聚四氟乙烯颗粒的尺寸为 200-800 nm。另外，结垢试验结果表明，90天后，PTFE改性涂层表面未形成结垢。EIS 结果表明 PTFE 涂层由于其较高的电容比 Al2O3-TiO2 涂层具有更高的耐腐蚀性。盐雾试验后，PTFE和Al2O3-TiO2涂层的接触角分别为47°和150°。因此，改性涂层比Al2O3-13% TiO2涂层具有更高的耐腐蚀性能。