Development of nanostructured icephobic aluminium oxide surfaces for aeronautic applications
Development of nanostructured icephobic aluminium oxide surfaces for aeronautic applications
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DOI：
10.1016/j.surfcoat.2020.126652
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发表时间：
2021
影响因子：
5.4
通讯作者：
Clémentine Belaud;Vittorio Vercillo;M. Kolb;E. Bonaccurso
中科院分区：
文献类型：
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作者：
Clémentine Belaud;Vittorio Vercillo;M. Kolb;E. Bonaccurso
由于过冷水滴的撞击，飞行中的结冰改变了飞机气动表面的形状，导致失速速度较低，燃料消耗较高。憎冰涂层有助于降低冰与表面的附着强度，是支持机械/热防冰系统的一种很有前途的技术。超疏水表面是憎水的，并包含了一种简单的解决结冰问题的解决方案：通过阳极氧化生成纳米结构多孔氧化铝层，并可以通过调节孔径大小来实现超疏水。然而，没有做太多的研究来验证这种表面在典型的结冰条件下是否通常是疏水的，或者它们是否需要具有额外的特性来有效地减少冰的粘附性。在这项工作中，我们研究了覆层铝合金2024(AA2024)，这是一种常用的航空零部件合金，在不同的工艺参数下，在硫酸和草酸中进行阳极化处理，并用商业氟化产品进行疏水处理，研究了覆层铝合金2024(AA2024)的结冰强度。通过对两种阳极氧化工艺的优化，表面生成的微/纳米结构有效地降低了冰层的粘结强度。从结冰风洞测试中，草酸阳极氧化的表面表现出比在硫酸中阳极氧化更好的疏水性(即较低的冰附性)，因为它们具有更大的气固比。所提出的阳极氧化工艺速度快，易于实施，并可在现有生产线上实施，成本低，对操作员和环境友好。
In-flight icing due to the impingement of supercooled water droplets modifies the shape of the aerodynamic surfaces of aircraft, resulting in lower stall speeds and higher fuel consumption. Icephobic coatings help reducing the adhesion strength of ice to a surface and represent a promising technology to support mechanical/thermal ice protection systems. Superhydrophobic surfaces are water-repellent and embody a straightforward solution to tackle icing: nanostructured porous aluminium oxide layers are generated with anodization and superhydrophobicity can be reached by tuning the pores size. However, not much research has been done to verify if such surfaces are generally icephobic in representative icing conditions, or if they need to have additional properties to effectively reduce ice adhesion. In this work, we investigate the ice adhesion strength on cladded Aluminium Alloy 2024 (AA2024), an alloy commonly used for aerospace components, anodized with different process parameters in sulphuric and oxalic acid and hydrophobized by a commercial fluorinated product. Upon the optimization of the two anodization processes, the micro-/nanostructures generated on the surface were effective in reducing the ice adhesion strength. From icing wind tunnel tests, the surfaces anodized in oxalic acid showed superior icephobic (i.e., lower ice adhesion) properties compared to the ones anodized in sulphuric acid because of their larger air-to-solid surface ratio. The proposed anodization process is fast, easy to perform and to implement in existing production lines, low-cost, and operator- and environmentally-friendly.