Entrapment of polyaspartic acid on silica nanoparticle for self‐healing coatings

The present work studies a self‐healing coating based on nanocontainers entrapped polyaspartic acid as corrosion inhibitor. To produce the nanocontainers the layer by layer deposition procedure was used where natural polyelectrolyte chitosan (CS) and polyaspartic acid (PASP) layers were alternatively deposited on SiO2 nanoparticles surface for obtaining a final structure of SiO2/CS/PASP/CS/PASP. The synthesized nanocontainers have been analyzed using zeta‐potential measurement, Fourier transform infrared spectroscopy, and scanning electron microscope. Zeta potential results demonstrate the CS or PASP layer adsorbed on the nanoparticles upon each added layer by electrostatic interaction. The anticorrosion performance of the self‐healing coatings was tested by electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. The results showed excellent anticorrosion performance in self‐healing coating, indicating promising practical application in the field of organic coating. The present work studies a self‐healing coating based on nanocontainers entrapped polyaspartic acid as corrosion inhibitor. To produce the nanocontainers the layer by layer deposition procedure was used. The results showed excellent anticorrosion performance in self‐healing coating, indicating promising practical application in the field of organic coating.