Preparation of TiO2 Superhydrophobic Composite Coating and Studies on Corrosion Resistance

Abstract

The superhydrophobic coatings with excellent performance are prepared on the brass substrate to improve its application limitations in real production. In this article, the superhydrophobicity was obtained by the modification of TiO2 nanoparticles, and the FAS/STA-TiO2 superhydrophobic coating of the composite structure was obtained by modification of 1, 1, 2H, 2H-perfluoroquine trimethyl silane (FAS). By using scanning electron microscopes (SEMs), X-ray spectrometers (EDSs), and Fourier transform infrared (FTIR) spectrometers, the surface morphology, chemical composition, and functional group structure of the samples were analyzed in turn. Experiments show that the water contact angle of the FAS-modified STA-TiO2 coating reaches 161.3°, and the sliding angle is close to 1.2°. Based on the chalk dust containment, it has enabled noticeable self-cleaning properties. The composite superhydrophobic coating also presents enhanced adhesive strength compared with the single coating by the tape peeling experiment. Moreover, the composite coating has a corrosion current density as low as 8.41 × 10-7 A/cm2, and the largest |Z| in low frequency in a 3.5% NaCl solution to achieve better protection of the brass substrate. It is also not difficult to see that FAS/STA-TiO2 coating can not only improve the corrosion resistance of brass substrates but also be applied to other metal substrates.

Anti-mold, self-cleaning superhydrophobic bamboo fiber/polypropylene composites with mechanical durability

“…Mechanical durability is a critical requirement for the practical applications of BPC-TiO 2 -F. In this study, the mechanical durability of BPC-TiO 2 -F was characterized by sandpaper abrasion, tape adhesion, and finger wiping ( Wang et al, 2020 ; Zhou et al, 2022 ). Changes in the water CA were recorded after every five abrasion cycles, as shown in Figure 8A .…”

Polystyrene Nanofibrous Membrane Infused with TiO2 Nanoparticles by a One-Step Electrospinning Process for Effective Oil–Water Separation

“…The first method focuses on creating a superhydrophobic and oleophilic surface, resulting in water depletion and oil permeation through the membranes. Various techniques were employed, such as spraying TiO 2 nanoparticles with the fluorosurfactant capstone onto a stainless steel mesh, self-growing TiO 2 nanoparticles on silicone rubber, and dip coating TiO 2 /fluoroalkyl groups onto high-density polyethylene (HDPE) and brass substrates. − However, these materials were not explored for oil–water separation. In separate studies, cellulose sponge spray-coated with TiO 2 nanoparticles and octadecyltrimethoxysilane, as well as fluoroalkyl silane-functionalized TiO 2 nanoparticles coated fabrics, were synthesized and utilized for immiscible oil–water separation. − Yet, these superhydrophobic materials were not tested for separating oil–water emulsion mixtures.…”

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

“…Various strategies for constructing superhydrophobic surfaces on metal substrates have been investigated in the past decades [ 5 , 6 ]. Techniques for surface modification include chemical etching [ 7 ], laser patterning methods [ 8 , 9 ], wet etching [ 10 ], Chemical Vapor Deposition (CVD) [ 11 ], micro-arc oxidation (MAO) [ 12 ], and surface coating of intrinsically low energy materials, such as PDMS, fluoropolymers, and fluorinated silanes [ 13 , 14 , 15 , 16 ]. These methods either employ expensive machines or use harsh chemicals to change the metal surface conditions.…”