Abstract
Epoxy formulations containing 1%, 3%, and 5% SiO2 nanoparticles (SNPs) were produced and applied to mild steel substrates in order to improve their thermal, nanomechanical, and abrasion resistance. Field emission scanning electron microscopy (FE-SEM) was used to analyze the dispersion of nanoparticles in the final coating samples, and Energy-dispersive X-ray spectroscopy (EDX) was used to confirm the presence of nanoparticles. Thermogravimetric analysis (TGA) was employed to measure the thermal resistance of the prepared coatings. Conventional techniques were used to measure the impact and scratch resistance. For nanomechanical testing, nanoindentation was performed using a Berkovich-type indenter. Using a taber abraser, the abrasion properties of the coatings were measured. The FE-SEM images indicated good dispersion of the nanoparticles at all three different loading levels. The scratch, impact, and hardness of coatings improved with the addition of the SNPs. Nanomechanical properties, such as hardness and elastic modulus, improved when compared to the unmodified coatings. The thermal and abrasion resistances of the coatings improved with the increase in the SNPs content of the coatings. The highest mechanical, thermal, and abrasion properties were obtained for the coatings with 5% SNP content.
Highlights
The application of organic and inorganic coatings has been well studied with respect to the protection of metals against corrosion and their effectiveness for various structures
Addition nanoparticles in the of epoxy, images were taken at theofsame
Morphological studies showed a good dispersion of the nanoparticles and some well distributed aggregates of the nanoparticles
Summary
The application of organic and inorganic coatings has been well studied with respect to the protection of metals against corrosion and their effectiveness for various structures. Despite the significant development in coating technologies, challenges remain in the long-term protection of metals from damage and aggressive environments. In addition to the composition of the coating—which consists of resin, solvents, fillers, and additives, such as UV stabilizers and wetting agents—the performance and durability of the coatings depends on several other parameters, such as the type of substrate, pretreatment of the substrate, curing thickness of the coating, and adhesion between the substrate and the coating. Recent efforts aimed at reducing the emissions of volatile organic compounds have motivated the coating-technology research community to develop products with high solid content, powder coatings, or water-born coatings with fewer organic solvents. It is essential to study the interaction of the components of the coating compositions to develop formulations for high-performance applications [1]. Many studies that are related to coating systems containing nanoparticles have already been published, such as those on epoxy/TiO2 and
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