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Journal of Coatings Technology and Research

Erschienen in:

08.09.2020

Characterization of water-repellent and corrosion-resistant superhydrophobic surfaces on galvanized steel

verfasst von: Thet Htet Naing, Vishnu Rachpech, Somjai Janudom, Narissara Mahathaninwong

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 6/2020

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Abstract

Corrosion-resistant superhydrophobic surfaces were successfully fabricated on galvanized steel through a wet oxidation treatment and stearic acid modification. In this work, the formation mechanism of superhydrophobic surfaces and structures were characterized with contact angle meter, scanning electron microscope (SEM), X-ray diffractometer (XRD), and Fourier transform infrared spectroscopy (FTIR). The surface properties of superhydrophobic and non-superhydrophobic surfaces were assessed by calculating surface free energy (γ) and work of adhesion (W_st). Moreover, the corrosion behavior and durability of superhydrophobic surfaces were examined in 3.5 wt% NaCl solution for up to 14 days. Superhydrophobic galvanized surfaces with WCAs of 168° (γ = 0.01 mN/m and 1.57 mN/m) and 162° (γ = 0.04 mN/m and W_st = 3.52 mN/m) were successfully obtained by modifying HCl etched surfaces with ethanolic stearic acid, with or without wet oxidation. According to the results, a zinc stearate layer on the surfaces effectively enhanced their corrosion resistance by numerous air pockets on the surfaces with hierarchical micro-/nanostructures that inhibited penetration by the NaCl solution. Moreover, superhydrophobic as-synthesized ZnO surface by wet oxidation had better corrosion durability than a superhydrophobic etched surface because of the strong physical and chemical bonding of stearic acid onto the as-synthesized ZnO nanorods.

Vorheriger Artikel Extracts of curcumin-incorporated hybrid sol–gel coatings for the corrosion mitigation of mild steel in 0.5 M HCl

Nächster Artikel Hydrophobicity and wear resistance of ceria/PTFE composite coatings

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Titel: Characterization of water-repellent and corrosion-resistant superhydrophobic surfaces on galvanized steel
verfasst von: Thet Htet Naing
Vishnu Rachpech
Somjai Janudom
Narissara Mahathaninwong
Publikationsdatum: 08.09.2020
Verlag: Springer US
Erschienen in: Journal of Coatings Technology and Research / Ausgabe 6/2020
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI: https://doi.org/10.1007/s11998-020-00372-x

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