Preparation and characterization of hollow ceria based smart anti-corrosive coatings on copper

Hollow CeO2 nanoparticles were prepared and employed as nano -carriers to encapsule benzotriazole inhibitor. The benzotriazole loaded formulations were co-electrodeposited with silanol groups to fabricate a superhydrophobic self -healing silane nanocomposite on copper. The CeO2 nano -containers had a high loading amount of 21.7%. The release of BTA inhibitor in CeO2@BTA composite was pH responsive. Potentiodynamic polarization tests and electrochemical impedance spectroscopy were conducted to evaluate the corrosion protection and self -repairing ability of the deposited CeO2@BTA-silane nanocomposite in 1 M NaCl solution. Potentiodynamic polarization curves suggested that the CeO2@BTA-silane coated sample exhibited a noble corrosion potential and decreased corrosion current density in comparison with the uncoated specimen. The inhibition efficiency was found to be 99.7%. After 20 d immersion, the impedance modulus at 0.01 Hz decreased slightly to 557.2 k Omega.cm(2) from 582.3 k Omega.cm(2), revealing an outstanding chemical stability. Most of the artificial defects were sealed and repaired by the formed CeO(2 )passive coating and Cu-BTA complex. This paradigm offers an efficient strategy for constructing excellent anti -corrosion and self -healing coatings.