Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂

Abstract

Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion performance of nanoparticulate SiO 2 modified epoxy coatings on carbon steel in 3.5 wt% NaCl solution, coupled with salt spray test. Capacitancegravimetric methods and delamination tests were performed to analyze the water uptake behavior and interface stability against delamination of modified coatings, respectively. Four systems were studied, including a clear coating and three pigmented coatings (with 1, 2, and 3 wt% nanoparticulate SiO 2 ). The experimental results showed that nanoparticulate SiO 2 particles can improve the anti-corrosion performance of the coatings and the optimal addition content is 2 wt%. The results obtained with capacitance-gravimetric measurements showed that the diffusion process of water through epoxy coatings with different pigment volume concentration (PVC) obeyed the second Fick's diffusion law in the initial period. Adding nanoparticulate SiO 2 into epoxy coatings can act effectively. The positive influence is attributed to the reaction between nanoparticles and epoxy resin which is confirmed by FTIR, improving the barrier and dispersion effectiveness of coatings. The negative one is increasing the number of pores in the coatings when the adding amount is beyond the critical PVC.

Tribological and anti-corrosion performance of epoxy resin composite coatings reinforced with differently sized cubic boron nitride (CBN) particles

“…At the same time, composites reinforced with differently sized particles displayed different results in terms of compactness, dispersibility, and barrier, which significantly influenced their anticorrosion behaviors under water conditions. Li et al [16] investigated the anti-corrosion behaviors of nano SiO 2 -modified EP coatings, and Mostafaei et al [17] investigated the anti-corrosion behaviors of ZnO nanoparticle-modified polyaniline coatings. The results showed that nano composite coatings can act as either a physical barrier toward a corrosive environment, or as inhibitory pigments by shifting the corrosion potential of the metallic substrate to higher values and reducing the corrosion rate.…”

The Role of SiO2 Gas in the Operation of Anti-Corrosion Coating Produced by PVD

“…Al is evaporated by the conventional flash method. SiO x preparation and sublimation are described elsewhere [6].…”

Application of Nanoparticles in Manufacturing

“…The flexural strength of self-compacting concrete can be improved by adding up to 4 wt% SiO 2 nanoparticles; however, the strength is reduced when the addition is over this amount [288]. The anticorrosion performance of epoxy-coated mild steel can be improved by the addition of 2 wt% SiO 2 nanoparticles; however, when the addition is over this amount, the number of pores in the coating is increased, thus having a negative impact on corrosion inhibition [223].…”