Manufacturing of a Smart Coating by Using SiO2 Nanoparticles and Hexamine

Abstract

Recent years have seen a significant increase in interest in smart anti-corrosion coatings, which can detect corrosive situations and autonomously discharge corrosion inhibitors. The mild steel surface was coated with pH-sensitive nanocontainers that had been manufactured and doped into an epoxy coating. Elemental mapping, Thermogravimetric Analysis (TGA)/ Differential Scanning Calorimetry (DSC), and Electrochemical Impedance Spectroscopy (EIS) methods were used to examine dispersion homogeneity, thermal durability, and corrosion tolerance. The findings indicated that nanocontainers dispersed uniformly in epoxy and that doping nanocontainers had no effect on the epoxy properties. When immersed in NaCl solution with nanocontainer doping concentrations of 3, 6, and 9 percent, EIS findings showed a rise in epoxy corrosion resistance following 5, 10, 15, 25, and 30 days. This enhancement was attributable to the smart release of corrosion inhibitors to protect steel surfaces. IR thermography and corroded substrates images confirmed the EIS data. Korsmeyer-Peppas kinetic model was the best model for fitting the obtained data.