Microtexturing D2 steel surface to induce superhydrophobicity on it using EDM process
DOI:
https://doi.org/10.58368/MTT.22.6.2023.68-74Keywords:
Surface Texturing, Texture Dimension, Hydrophilicity, Hydrophobicity, Contact AngleAbstract
This work attempts to induce superhydrophobicity on a hydrophilic D2 steel surface by microtexturing, using the Electro-discharge machining process, as hydrophobic surfaces offer enhanced self-cleaning and corrosion resistance. The laser machining process is praiseworthy for surface texturing on nonmetals but not widely recommended for conductive metals. Electro-discharge machining is very effective for micro fabrications on metals and its potential in surface texturing should be explored. Texturing of the D2 steel surface is done by fabricating microchannels in mutually perpendicular directions using a thin Cu foil as a tool in the EDM process. Texture dimensions in relation to the microchannel width are calculated from Cassie-Baxter equations. It has been observed that surface texturing improves the contact angle of water droplets on a metallic surface. The static contact angle of a water droplet on a hydrophilic D2 steel surface was increased from 78.6° to 158.7°, resulting in superhydrophobicity.
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