International Journal of Iron & Steel Society of Iran

International Journal of Iron & Steel Society of Iran

Investigation of the Effect of SiO2 Nanoparticles on Corrosion-Wear-Impact Resistance, and Bending Strength of Acrylic Coating Applied To Steel Substrate

Document Type : Research Paper

Authors
S. Arzani
H. Reza Pakzaman
Department of Research and Development, Iran Alloy Steel Company, Yazd, Iran
10.22034/ijissi.2025.2041117.1305
Abstract
 This study applied a nanocomposite coating to a plain carbon steel substrate using the air spray method. Various amounts of SiO2 nanoparticles (2-6%) 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 SiO2 nanoparticles exhibited significantly higher wear, impact, and bending resistance than coatings without nanoparticles and showed better adhesion to the steel substrate. Moreover, increasing the SiO2 nanoparticles content in the coating considerably improved the coating's hardness and resistance to corrosive agents in 3.5 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 SiO2 particles. Considering economic factors and the issue of particle agglomeration, 4% SiO2 nanoparticles were determined as the optimal filler content for the nanocomposite coating. It was found that adding 4% SiO2 nanoparticles to the polymeric coating led to a reduction in the corrosion rate and weight loss due to wear by 93% and 29%, respectively, compared to coatings without nanoparticles. Furthermore, the coating's adhesive strength and impact resistance increased by 20% and 50%, respectively. 
Keywords
Steel substrate
Polymer coating
SiO2 nanoparticles
Corrosion resistance
Wear resistance
Impact resistance
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