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Hydrophobic Aluminum Alloy Surfaces Fabricated by Imprinting Process and Their Wetting State Evaluation Using Air Layer Images

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Abstract

This paper presents an imprinting process, which can impart hydrophobicity to aluminum alloy surfaces, and a method for analyzing the wetting states of solid surfaces with multi-scale structures. Electrical discharge textured (EDT) surface and groove pattern molds were produced by electrical discharge machining (EDM) and wire electrical discharge machining (WEDM), respectively. The aluminum surfaces having hierarchical patterns were produced by imprinting processes using both EDT surface and groove pattern molds. The groove patterns with various pitches from 400 to 1,000 µm were applied to the mold designs, so that the effects on static water contact angle (WCA) could be analyzed. Results showed that the hydrophobic aluminum surface with WCA of 117.6° can be achieved through the facile imprinting process. In addition, a wetting state analysis method using air layer images was proposed. Using this method, it was demonstrated that the surface wetting state can be accurately analyzed by combining the air layer images and the theoretical models such as the Cassie–Baxter, and Wenzel models.

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Acknowledgements

This research was financially supported by the Ministry of Trade, Industry, and Energy (MOTIE), Korea, under the “Digital manufacturing platform (DigiMaP)” (reference number N0002598) supervised by the Korea Institute for Advancement of Technology (KIAT). This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (2019R1A2C4070160). Author Dr. Seong-Hoon Kang thanks for support from the Basic Research Program of the Korea Institute of Materials Science. The authors have no conflict of interests to declare.

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  1. Seong-Hoon Kang, Jonghun Yoon have contributed equally

Authors and Affiliations

  1. Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam, 51508, Republic of Korea

    In Yong Moon & Seong-Hoon Kang

  2. Department of Mechanical Engineering, BK21FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Kyeonggi-do, 15588, Republic of Korea

    Jonghun Yoon

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  1. In Yong Moon
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Moon, I.Y., Kang, SH. & Yoon, J. Hydrophobic Aluminum Alloy Surfaces Fabricated by Imprinting Process and Their Wetting State Evaluation Using Air Layer Images. Int. J. Precis. Eng. Manuf. 22, 147–159 (2021). https://doi.org/10.1007/s12541-020-00441-6

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