Impact of silica nanoparticles on the morphology and mechanical properties of sol-gel derived coatings

Abstract

Although corrosion resistance and mechanical properties of sol-gel coatings have been studied independently, there are limited studies that consider both collectively. However, since any form of mechanical damage could impair the protective function of the coating, it is prudent to consider the mechanical durability of coatings as well as their corrosion resistance. The present work considers the impact of silica nanoparticles on the morphology and mechanical properties of a sol-gel derived coating. The relationships between the results obtained from tests such as atomic force microscopy (AFM), nanoindentation or erosion test with previously reported corrosion results obtained via salt spray or electrochemical impedance spectroscopy (EIS) are discussed. Results show that reinforcing a sol-gel coating with silica nanoparticles and, particularly, functionalised silica nanoparticles led to coatings with improved mechanical properties and enhanced erosion impact resistance. The role of nanoparticles on improving mechanical properties and corrosion resistance, which is of importance within the coating industry, is discussed. Highlights:-Effect of SiO2 on morphology and mechanical properties in a sol-gel coating was studied-SiO2 surface treatment improved mechanical durability and corrosion resistance-Importance of studying mechanical and corrosion resistance properties of coatings has been proved

Nanostructured Surface Finishing and Coatings: Functional Properties and Applications

“…They evaluated the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film, made by 3-glycidoxy-propyl-trimethoxy-silane (GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors and filled with silica or alumina nanoparticles [180]. A similar study was performed by Vivar Mora et al, which assessed the impact of silica nanoparticles on the morphology and mechanical properties of a GPTMS/TEOS sol-gel coating [186]. The authors observed that features, such as hardness, elastic modulus, brittleness and fracture toughness, were improved when the mild steel surface was treated with silica NPs, leading to a more durable and corrosion resistant coating.…”

Nanostructured Surface Finishing and Coatings: Functional Properties and Applications

“…They evaluated the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film, made by 3-glycidoxy-propyl-trimethoxy-silane (GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors and filled with silica or alumina nanoparticles [176]. A similar study was performed by Vivar Mora et al, which assessed the impact of silica nanoparticles on the morphology and mechanical properties of a GPTMS/TEOS sol -gel coating [182]. The authors observed that features, such as hardness, elastic modulus, brittleness and fracture toughness, were improved when the mild steel surface was treated with silica NPs, leading to a more durable and corrosion resistant coating.…”

Pressure and osmotically driven membrane processes: A review of the benefits and production of nano-enhanced membranes for desalination

“…Due to their small size and high surface area to volume ratio, their physical and chemical properties are enhanced in comparison to their bulk state (Lisjak & Mertelj 2018). Within such small size units, the effective surface area becomes very large, owing NMs unique optical (Bhalla & Tyagi 2018), magnetic (Hu et al 2018) and mechanical properties (Vivar Mora et al 2018). In figure 7, a schematic diagram demonstrates the importance of NMs in the applications of water treatment and purification.…”