Journal
SURFACE & COATINGS TECHNOLOGY
Volume 302, Issue -, Pages 535-542Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.06.051
Keywords
Hydrophobicity; Micropatterning; Steel; Electron beam irradiation; Discharge machining
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education [2015R1A2A2A01005499]
- Development of High Power Density Electron Beam Micro-drilling Machine and Process for High Aspect-ratio Micro-hole Parts - Ministry of Trade, Industry and Energy [10063367]
- National Research Foundation of Korea [2015R1A2A2A01005499] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Patterns were fabricated on AISI 304 stainless steel combining the wire electric-discharge machining (WEDM) with large pulsed electron beam (LPEB) irradiation to improve the surface hydrophobicity and corrosion resistance of the alloy. The WEDM-fabricated patterns showed a Wenzel-to-Cassie transition with contact angle (CA) of 140 degrees at a groove depth of 250 mu m, which indicated hydrophobic surface. LPEB irradiation of the WEDM-fabricated patterns increased the CA (166.7 degrees) to the Cassie state at a lower groove depth of 200 gm. The LPEB-irradiated patterns had smooth surfaces that decreased the critical angle for Wenzel-to-Cassie transition. Attenuated total reflection-infrared spectroscopy revealed that hydrophilic functional groups on the surface were absent following LPEB irradiation. LPEB irradiation modified the surface corrosion resistance of a WEDM-fabricated pattern, likely because of a lower surface energy and formation of a passive resolidified layer following irradiation. (C) 2016 Elsevier B.V. All rights reserved.
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