A highly controlled fabrication of porous anodic aluminium oxide surface with versatile features by spatial thermo-anodization

SURFACE & COATINGS TECHNOLOGY

卷:408

Article

Zhang, Zhehui¹  Sridhar, Sreepathy²  Wei, Guoying¹  Yu, Yundan¹  Zhang, Zhongquan¹  Jiang, Li¹  Yang, Yumeng¹  Shahzad, Muhammad Wakil²  Chen, Xue²  Ben Bin Xu^1,2 

[1] China Jiliang Univ, Coll Mat & Chem, Hangzhou 310018, Peoples R China

[2] Northumbria Univ, Fac Engn & Environm, Dept Mech & Construct Engn, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

关键词: Anodic oxidation;    Solar absorptivity;    Emittance;    Surface wetting;    Anti-freezing;   

DOI  :  10.1016/j.surfcoat.2020.126809

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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