Eco-Friendly Anticorrosion Superhydrophobic Al2O3@PDMS Coating With Salt Deliquescence Self-Coalescence Behaviors Under High Atmospheric Humidity

Abstract

Bio-inspired superhydrophobic coatings have been demonstrated to be promising anticorrosion materials. However, developing robust superhydrophobic coatings through simple one-step fluorine-free procedures to meet various functional requirements remains a major challenge. In this study, we fabricated an eco-friendly superhydrophobic Al2O3@PDMS composite coating with mechanical robustness based on Al2O3 NPs, PDMS, and spray coating technique. To characterize surface morphologies, chemical compositions, surface wettability, and anticorrosion properties, FE-SEM, EDS, XPS, contact angle meter, electrochemical impendence spectroscopy, and potentiodynamic polarization techniques were employed. The electrochemical results show that |Z|0.01 Hz and Rct values of the superhydrophobic Al2O3@PDMS coating were four orders of magnitude higher than bare Q235 carbon steel, indicating a significant improvement in corrosion resistance. Furthermore, the deliquescence behaviors of NaCl salt particles and the instantaneous self-coalescence phenomenon were recorded under high atmospheric humidity to suggest that a superhydrophobic surface with Cassie–Baxter interfacial contacts can serve as an efficient barrier to suppress the formation of saline liquid thin films and protect the underlying substrate from corrosion. This robust superhydrophobic Al2O3@PDMS coating is expected to be easily applied to a variety of substrates and to find potential applications for liquid repellency, self-cleaning, corrosion resistance, and other properties.

Дослідження Впливу Складу Модифікованого Лігніно-Епоксидного Покриття На Корозійну Стійкість З Використанням Методу Поверхні Відгуку

“…Moreover, the materials and processes used to synthesize the coatings can sometimes be environmentally harmful. The study of Binbin Zhang et al [11] is one of the few studies addressing these aspects. Thus, a different approach has been taken by the current study in the formulation of the coating.…”

Effect of Solvent on Superhydrophobicity Behavior of Tiles Coated with Epoxy/PDMS/SS

“…A material is known to be superhydrophobic when it has a water contact angle of more than 150 • and a negligible titling angle of less than 10 • [1,2]. Superhydrophobic coating has gained more attention and lead to many applications such as antiicing [3,4], anti-fogging [5,6], oil-water separation [7,8], anti-corrosion [9][10][11], selfcleaning [12,13], antibacterial [14,15] and biomedical applications [16]. Various methods that have been used for preparation of rough surfaces are layer by layer assembly [17,18], spray-coating [19][20][21], lithography [22,23], sol gel processing [24,25], electrochemical deposition [26,27] and chemical vapour deposition [28].…”

Anti-corrosion, anti-bacterial and durable atmospheric weatherability of polydimethylsiloxane coating with intrinsic hydrophobicity

“…Owing to the advantages of high economic efficiency, excellent tensile strength and thermal expansion coefficient, Q235 carbon steel has been widely applied as structural materials in marine engineering including shipbuilding industry, offshore platforms, harbor facilities, submarine pipelines, coastal constructions etc [1][2][3][4][5]. However, corrosion and biofoulings are inevitably occurred at the material-environment interface in the marine service conditions resulting from the existence of corrosive media such as Cl − , H 2 O, O 2 , microorganisms etc, resulting in performance degradation of materials, significant economic losses, ecological destruction, or even catastrophic accidents [6][7][8].…”