Superior Corrosion and UV-Resistant Highly Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/alumina Superhydrophobic Coating

Abstract

The current research is devoted to fabricating a superhydrophobic coating on alumina surfaces via a facile one-step electrospinning technique. The wettability properties of the as-prepared coating were investigated. The polymeric coatings exhibited a water contact angle (WCA) of about 152° ± 3 and a sliding angle (SA) is 4 ± 2°. However, a WCA of 154 ± 2° and a SA of 3 ± 2° were recorded after the addition of Al2O3 nanoparticles. The wettability of the prepared coatings has also been inspected after exposure to intense UV irradiation of 0.89 W/(m2 nm) and high-temperature degree of 60 °C, for 500 h. It was found that the measured WCA and water contact hysteresis (WCAH) for the poly­(vinylidene fluoride-co-hexafluoropropylene) PVDF-HFP/Al2O3 nanocomposite 150 ± 1° and 10 ± 1° compared with 122 ± 4° and 22 ± 4° of pure PVDF-HFP, respectively. The morphology of the superhydrophobic coating was explored, illustrating the construction of a beaded fiber structure. The surface roughness of the fabricated super water-repellent coatings was recorded using an atomic force microscope (AFM). The electrochemical behavior of superhydrophobic coating was evaluated by electrochemical impedance spectroscopy (EIS) in 3.5 wt % NaCl solution before and after exposure to UV radiation. The research outcomes promote a one-step fabrication technique to prepare polymeric superhydrophobic coatings with good resistance for corrosion and degradation under UV irradiation.

Superhydrophobic Porous Coating of Polymer Composite for Scalable and Durable Daytime Radiative Cooling

“…The chemical resistance test was conducted by immersing the PS/PDMS/PECA coating into different pH solutions (pH = 1, 3, 5, 7, 9, 12, 14) for 1 week followed by measurements of CA/SA values, solar reflectance, and emissivity. The UV resistance test was carried out using a QUV accelerated weathering machine (GB16776-2005, Zhongke Huanshi Instrument Co., Ltd., China). For one testing cycle, the sample was mounted and subjected to 8 h of UV exposure under an UV lamp (340 nm) with an intensity of 0.89 W/(m 2 nm) at 60 °C followed by 4 h moisture exposure by condensation at 50 °C.…”

Sprayable Superhydrophobic Polydopamine-Modified Oleic Acid/Nanoscale SiO2Composites for Insulator Protective Coatings

“…15 The authors also produced a polyurethane superhydrophobic coating using 8 wt% nanosilica sprayed over porcelain insulators. 16 The coating demonstrated high mechanical strength and UV resistance. Some researchers developed a superhydrophobic coating utilizing a suspension of SiO 2 -powder and SiO 2 -sol using a sol−gel process including tetraethoxysilane, perfluorodecyltriethoxysilane, ethanol, nitric acid, and hydrochloric acid.…”

“…Field studies have shown that RTV coatings have a maximum lifetime of 10 years under severe contamination conditions . The authors also produced a polyurethane superhydrophobic coating using 8 wt% nanosilica sprayed over porcelain insulators . The coating demonstrated high mechanical strength and UV resistance.…”

Anticorrosion Properties of Robust and UV-Durable Poly(vinylidene fluoride-co-hexafluoropropylene)/Carbon Nanotubes Superhydrophobic Coating

“…Superhydrophobic surfaces require an appropriate level of surface roughness and low surface energy. Most coatings incorporate nanoparticles or fibers as fillers to construct a hierarchically structured rough surface, such as Al 2 O 3 , SiO 2 , CNFs, graphene, and carbon nanotubes (CNTs). − …”