Recent studies on sol–gel based corrosion protection of Cu—A review

Balaji, J.; Raja, Pandian Bothi; Sethuraman, Mathur Gopalakrishnan; Oh, Tae Hwan

doi:10.1007/s10971-022-05818-9

Cited by 3 publications

(1 citation statement)

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“…Superhydrophobic coatings are usually prepared by a two-step process, where a surface with sufficient roughness is firstly constructed by various physical and chemical methods [ 17 , 18 , 19 , 20 ] and then further modified with low surface energy materials. Sol-gel methods [ 21 , 22 ] are increasingly adopted for the preparation of superhydrophobic surfaces due to the wide range selection of precursors, the relative simplicity of the wet chemical process, and the use of inexpensive and environmentally friendly raw materials. Conventionally, silica-based sol-gel coatings are applied by dip-coating, spray-coating, roller-coating, or spin-coating [ 23 , 24 ] processes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrochemical Assisted Deposition of Sol-Gel Silica Films for Long-Lasting Superhydrophobicity

Zhou

2023

Materials

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Current methods for the protection of metal surfaces utilize harsh chemical processes, such as organic paint or electro-plating, which are not environment-friendly and require extensive waste treatments. In this study, a two-step approach consisting of electrochemical assisted deposition (EAD) of an aqueous silane solution and a dip coating of a low surface energy silane for obtaining a superhydrophobic self-cleaning surface for the enhanced protection of copper substrate is presented. A porous and hierarchical micro-nanostructured silica basecoat (sol-gel) was first formed by EAD of a methyltriethoxysilane (MTES) precursor solution on a copper substrate. Then, a superhydrophobic top-coat (E-MTES/PFOTS) was prepared with 1H,1H,2H,2H-Perfluorooctyltriethoxysilane (PFOTS) for low surface energy. The superhydrophobic coating exhibited anti-stain properties against milk, cola, and oil, with contact angles of 151°, 151.5°, and 129°, respectively. The EAD deposition potential and duration were effective in controlling the microscopic morphology, surface roughness, and coating thickness. The E-MTES/PFOTS coatings exhibited chemical stability against acids, bases, and abrasion resistance by sandpaper. The proposed 2-layer coating system exhibited strong chemical bonding at the two interfaces and provided a brush-like surface morphology with long-lasting superhydrophobicity. The developed method would provide an environment-friendly and expedient process for uniform protective coatings on complex surfaces.

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