Investigation of the Effect of SiO۲ Nanoparticles on Corrosion-Wear-Impact Resistance, and Bending Strength of Acrylic Coating Applied To Steel Substrate

This study applied a nanocomposite coating to a plain carbon steel substrate using the air spray method. Various amounts of SiO۲ nanoparticles (۲-۶%) were incorporated into the acrylic polymer-based coatings, and the results of corrosion, wear, impact, bending, hardness, and adhesion tests on coatings with and without nanoparticles were compared. The results indicated that coatings containing SiO۲ nanoparticles exhibited significantly higher wear, impact, and bending resistance than coatings without nanoparticles and showed better adhesion to the steel substrate. Moreover, increasing the SiO۲ nanoparticles content in the coating considerably improved the coating's hardness and resistance to corrosive agents in ۳.۵ wt% NaCl solution. The enhanced properties of the nanoparticle-containing coating were attributed to factors such as increased coating density and cohesion and higher average stress required to damage the coating due to the addition of SiO۲ particles. Considering economic factors and the issue of particle agglomeration, ۴% SiO۲ nanoparticles were determined as the optimal filler content for the nanocomposite coating. It was found that adding ۴% SiO۲ nanoparticles to the polymeric coating led to a reduction in the corrosion rate and weight loss due to wear by ۹۳% and ۲۹%, respectively, compared to coatings without nanoparticles. Furthermore, the coating's adhesive strength and impact resistance increased by ۲۰% and ۵۰%, respectively.

کلیدواژه ها:

Steel substrate ، Polymer coating ، SiO۲ nanoparticles ، Corrosion resistance ، Wear resistance ، Impact resistance