An epoxy-amine coating exhibited high impedance after 30 days of NaCl immersion. Even artificially damaged epoxy-amine coatings displayed satisfactory performances.
In the present work, scientists used a tetrafunctional epoxy-amine resin as a coating for mild steel and used electrochemical impedance spectroscopy (EIS) to investigate its protection performance in a 3.5 wt % NaCl solution. The results indicate that the coating was able to resist corrosion and maintain a very high impedance modulus for more than 30 days of continuous exposure to the NaCl solution.
Different resistance behaviours, as indicated by EIS, were observed for the coatings with artificially introduced damage. The coating also showed high thermal resistance and good adhesion to mild steel surfaces.
The study was published in Progress in Organic Coatings, Volume 151, February 2021.