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Electrochemical Machining of Superhydrophobic Surfaces on Mold Steel Substrates

Song, J; Huang, W; Liu, J; Huang, L; Lu, Y; (2018) Electrochemical Machining of Superhydrophobic Surfaces on Mold Steel Substrates. Surface and Coatings Technology , 344 pp. 499-506. 10.1016/j.surfcoat.2018.03.061. Green open access

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Abstract

Superhydrophobic surfaces on mold steel substrates were fabricated via simple and environment-friendly electrochemical technology followed by fluoroalkylsilane (FAS) modification. The microstructure, crystal structure, chemical composition, and wettability of the sample surfaces were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and optical contact angle measuring instrument. The influences of current density and electrochemical machining time on wettability were also studied. The results show that, after the electrochemical processing, the mold steel substrates were covered with a layer of passive films, which have micro/nano binary rough structures composed of rugged plateau structures and rupture-like shapes. Before fluorination, the obtained sample surfaces showed superhydrophilicity (the water contact angles were almost 0°), while the sample surfaces became superhydrophobic (the water contact angles were 167.2° and the water rolling angles were 4.3°) after fluorination. The proposed method is simple, economical and environmental-friendly, and has great potential for large-scale industrial applications.

Type: Article
Title: Electrochemical Machining of Superhydrophobic Surfaces on Mold Steel Substrates
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.surfcoat.2018.03.061
Publisher version: https://doi.org/10.1016/j.surfcoat.2018.03.061
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Superhydrophobic surface, Electrochemical machining, Mold steel, Passive film
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/10058863
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