Journal
SURFACE & COATINGS TECHNOLOGY
Volume 408, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.126809
Keywords
Anodic oxidation; Solar absorptivity; Emittance; Surface wetting; Anti-freezing
Funding
- National Natural Science Foundation of China [21171155, 51471156]
- International Science and Technology Cooperation Programme of China [2011DFA52400]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/N007921/1]
- EPSRC [EP/N007921/1] Funding Source: UKRI
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Research focuses on achieving a porous black layer on the surface of aluminium alloy through an environmentally friendly anodic oxidation process, with high thermal emittance and solar absorptivity; the black thermo-anodized coating layer shows unique anti-corrosion property under UV irradiation; a hybrid hydrophobic surface and anti-icing feature can be realized through post-treatment with silane.
Thermo-anodization technology has been considered as an effective means to improve the thermal, physical and chemical properties for metal alloy. In this work, we achieve a porous black layer on the surface of aluminium alloy through an environmentally friendly anodic oxidation process, with a high thermal emittance (0.96) and a high solar absorptivity (0.921). In addition, the black thermo-anodized coating layer shows a unique anti-corrosion property under UV irradiation. A hybrid hydrophobic surface has been facilitated through treating the thermo-anodized porous layer with silane. Moreover, an anti-icing feature can be realised that can effectively delay the freezing of water droplet on the surface of AA2024 aluminium alloy. As such, the specific anodic process of coating provides a simple method for improving the solar absorptivity and infrared emittance of aluminium alloys, enabling broad applications in aerospace engineering.
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