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A superhydrophobic coating composed of epoxy on the bottom and siloxane-modified silica on the top was prepared by employing the scraping and spraying methods. The superhydrophobic coating possesses excellent mechanical properties, is superhydrophobic (water contact angle, WCA = 164.3°), and has low adhesion. The long-term corrosion resistance of the epoxy coating and the superhydrophobic coating in a 3.5 % NaCl solution and hydrogen sulfide environment was assessed using electrochemical impedance spectroscopy (EIS), polarization curve analysis, immersion testing, and X-ray diffraction (XRD). Test results indicate that the superhydrophobic coating has excellent anti-corrosion capability in an H 2 S environment for 50 days and in a 3.5 % NaCl solution for 60 days. This is of great significance for developing the potential applications of superhydrophobic coatings in H 2 S environments. [Display omitted] • Epoxy resin and superhydrophobic surface combination for carbon steel substrate protection. • The coating showed anticorrosive effect in 3.5 % sodium chloride solution. • Superhydrophobic surface has excellent corrosion resistance in H 2 S environment of alternating temperatures and humidities. [ABSTRACT FROM AUTHOR]

• Melamine modified carbon dots (Me-CDs) exhibits 92.36% corrosion inhibition efficiency on carbon steel in neutral medium. • Adsorption isotherm of Me-CDs conforms to Temkin adsorption model, involving both chemisorption and physisorption. • Hydrophobic Me-CDs film adheres on carbon steel via coordinate-covalent bond and multilayer accumulation effect. Melamine modified carbon dots (Me-CDs) was synthesized by hydrothermal method and used as effective corrosion inhibitor for Q235 carbon steel in 3.5 wt% sodium chloride (NaCl) solution. The microstructure and surface properties of Me-CDs were characterized using XRD, FTIR, XPS and TEM. The corrosion inhibition behavior and mechanism of Me-CDs for carbon steel were investigated using weight loss and electrochemical methods, in combination with some surface characterizations (including SEM, AFM and contact angle tester). Results showed that Me-CDs as mixed-type adsorbent inhibitor could effectively prevent carbon steel from corrosion, and the maximum corrosion inhibition efficiency can reach 92.36% at 200 mg/L. The absorption of Me-CDs conformed to Temkin adsorption model, involving both chemisorption and physisorption. Based on the results of characterization analysis, the chemisorption from multiple adsorption centers, physisorption by blocking and barrier effect, and the formation of hydrophobic film on the surface of carbon steel was proposed to clarify the corrosion inhibition mechanism of Me-CDs. [ABSTRACT FROM AUTHOR]

Low-cost and scalable fabrication processes are needed to prepare efficient superhydrophobic materials, particularly for oil/water separation and metal protection against severe oil spills and metal corrosion. Here, an effective oil/water separation mesh with long-lasting acid/base durability and corrosive resistance is reported. In this work, the mesh was fabricated by simply spraying nano soil particles cross-linked with melamine resin and impregnating them with polyethylene (PE) solution. The multi-layered morphology obtained from the spraying and impregnating process which provides the unique wetting properties for the stainless steel (SS) mesh, such as superhydrophobicity and low water adhesion. Also the low chemical activity of alkyl sp3 carbon-hydrogen bonds provides acid/base resistance for the manufactured material. By utilizing these unique properties, not only can gravity-driven efficient oil/corrosive fluid separation be achieved, but the fabricated superhydrophobic stainless steel (SSS) mesh retains high separation efficiency (> 99%) and superhydrophobicity (water contact angle, WCA > 150°) in reuse process of wastewater in treated oil. More importantly, this excellent protection can effectively reduce the corrosion rate of the mesh by more than two orders of magnitude (SS mesh i corr 1.82 × 10−8 A·cm−2; SSS mesh i corr 9.84 × 10−11 A·cm−2) which providing a long-lasting protection even after 16 days of immersion in 3.5 wt% NaCl solution. All in all, the easy operation, acid/base resistance, high separation efficiency, and corrosion inhibition efficiency of the SSS mesh give them great potential for oil/water separation and metal protection applications. [Display omitted] [ABSTRACT FROM AUTHOR]