A Highly Controlled Fabrication of Porous Anodic Aluminium Oxide Surface with Versatile Features by Spatial Thermo-anodization

Zhang, Zhehui, Sridhar, Sreepathy, Wei, Guoying, Yu, Yundan, Zhang, Zhongquan, Jiang, Li, Yang, Yumeng, Shahzad, Muhammad Wakil, Chen, Xue and Xu, Bin (2021) A Highly Controlled Fabrication of Porous Anodic Aluminium Oxide Surface with Versatile Features by Spatial Thermo-anodization. Surface and Coatings Technology, 408. p. 126809. ISSN 0257-8972

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Abstract

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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