Abstract
Nanosized zinc oxide (ZnO) particles modified with different silane coupling agents (octyltriethoxysilane (OTES), octadecyltriethoxysilane (ODTES) and (3-glycidyloxypropyl)trimethoxysilane (GPTMS)) were synthesized in basic catalysis using the sol-gel method. The structure and morphology were characterized by dynamic light scattering (DLS), environmental scanning electron microscopy (ESEM) and Fourier transform infrared spectroscopy (FTIR) for bonding characteristics. The final hybrid materials were deposited on three types of metallic substrates (aluminum (Al), copper (Cu) and zinc (Zn)) in order to obtain coatings with ultrahydrophobic and anti-corrosion properties. Water wettability was studied revealing a contact angle of 145° for the surface covered with ZnO material modified with ODTES. The water contact angle increased with the length of the alkyl chain supplied by the silica precursor. The anti-corrosive behavior of ZnO/silane coupling agents particles deposited on metallic substrates was studied by the linear polarization technique in neutral medium.
Highlights
The results showed that under acidic conditions, the nonpolar long alkyl chain group of the stearic acid molecule reacted with the hydroxyl group in acetic acid, the metal ions of the zinc oxide (ZnO) were displaced to the stearic acid and generated globular zinc stearate (C36 H70 O4 Zn) [4]
ZnO nanoparticles were modified through sol-gel method with octyltriethoxysilane (OTES), (3-glycidyloxypropyl)trimethoxysilane (GPTMS) and octadecyltriethoxysilane (ODTES) coupling agents, in order to improve the anti-corrosive properties of three metallic substrates: aluminum (Al), copper (Cu) and zinc. (Zn) The water contact angles of the final metallic coatings were measured and their corrosion behavior was investigated through linear polarization technique
Commercial ZnO nanopowder (
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. One of the most commonly used methods for corrosion protection based on sol-gel technology is the design of hydrophobic or super-hydrophobic surfaces, because of their ability to repel water and aqueous electrolyte, anti-icing and anti-fouling [10,14]. In this respect, a very good strategy is to change the morphology of the outer surface of the sol-gel coating by using silane coupling agents with different alkyl chains. ZnO nanoparticles were modified through sol-gel method with octyltriethoxysilane (OTES), (3-glycidyloxypropyl)trimethoxysilane (GPTMS) and octadecyltriethoxysilane (ODTES) coupling agents, in order to improve the anti-corrosive properties of three metallic substrates: aluminum (Al), copper (Cu) and zinc. The obtained zinc oxide nanomaterials produced in this way can be extended to many industrial applications due to the good electrical and optical properties, especially in the electronic industry
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