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Newly synthesized 3-amino-1,2,4-triazole-5-thiol (ATT) functionalized Al 2 O 3 -ZnO nanoparticles were added to epoxy resin (EP). The anticorrosion properties of newly synthesised formulations like EP/Al 2 O 3 -ZnO and EP-ATT/Al 2 O 3 -ZnO nanocomposite coated steel samples were investigated electrochemically using scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS). In natural seawater, EIS experiments indicated outstanding protective behaviour for the EP-ATT/Al O 3 -ZnO coated steel. The EP-ATT/Al 2 O 3 -ZnO nanocomposite coating resistance was reported to be 2110.44 kΩ·cm 2 , whereas EP/Al 2 O 3 -ZnO coating (1730.45 kΩ·cm 2 ) and pure epoxy coating (61.21 kΩ·cm 2 ) had lesser coating resistance. The coating resistance of EP-ATT/Al 2 O 3 -ZnO nanocomposite was found to be more than 34% greater than that of PU coating. The measured current by SECM analysis over the EP-ATT/Al 2 O 3 -ZnO nanocomposite coating was very low (1.6 nA) compared to EP/Al 2 O 3 -ZnO (3.7 nA) and pure epoxy coated steel (5.9 nA). The surface morphological studies of the coated steel by SEM/EDX analysis and X-ray diffraction (XRD) analysis revealed that the Al 2 O 3 -ZnO nanoparticles were enriched at the corrosion products which prevented corrosion initiation processes. The peel strength of the EP-ATT/Al 2 O 3 -ZnO nanocomposite film was found to be 982 ± 13 N/cm when the concentration of ATT/Al 2 O 3 -ZnO nanoparticles was 2 wt.%. Moreover, the resultant EP-ATT/Al 2 O 3 -ZnO formulation exhibited an excellent hydrophobic behaviour (WCA: 117°). Therefore, it was concluded from the electrochemical and mechanical investigation that the newly synthesized EP-ATT/Al 2 O 3 -ZnO nanocomposite provided an excellent barrier and mechanical properties due to the addition of ATT/Al 2 O 3 -ZnO nanoparticles to the epoxy resin which prevented the degradation of materials and helped to prolong the life of the coated steel.HIGHLIGHTSElectrochemical studies revealed excellent coating resistance and a decreased corrosion current density for the EP-ATT/Al 2 O 3 -ZnO coated steel in natural seawaterIt was found that the coating resistance of EP-ATT/Al 2 O 3 -ZnO nanocomposite was over 34% higher than that of the epoxy coating.The EP-ATT/Al 2 O 3 -ZnO coating retarded the propagation of aggressive ions to the coating/steel interface.The reinforcement of ATT/Al 2 O 3 -ZnO nanoparticles in the epoxy coating exhibited a smooth microstructure producing superior corrosion protection and excellent hydrophobic and dynamic mechanical properties.The addition of ATT/Al 2 O 3 -ZnO nanoparticles to the epoxy prevented the degradation of materials and helped to prolong the life of the coated steel. Electrochemical studies revealed excellent coating resistance and a decreased corrosion current density for the EP-ATT/Al 2 O 3 -ZnO coated steel in natural seawater It was found that the coating resistance of EP-ATT/Al 2 O 3 -ZnO nanocomposite was over 34% higher than that of the epoxy coating. The EP-ATT/Al 2 O 3 -ZnO coating retarded the propagation of aggressive ions to the coating/steel interface. The reinforcement of ATT/Al 2 O 3 -ZnO nanoparticles in the epoxy coating exhibited a smooth microstructure producing superior corrosion protection and excellent hydrophobic and dynamic mechanical properties. The addition of ATT/Al 2 O 3 -ZnO nanoparticles to the epoxy prevented the degradation of materials and helped to prolong the life of the coated steel.

Superior barrier, hydrophobic, and mechanical properties of the epoxy nanocomposite containing mixed metal oxides