Abstract
In a quest for smart coatings, a novel multi-level active/barrier composite coating was developed. For this aim, the polyaniline grafted graphene oxide nano-sheets were decorated with ZIF-9 type metal-organic framework (MOF). The GO sheets incorporation into the polymeric coating could promote its barrier effect against corrosive agents. Also, the polyaniline-reduced GO sheets provide proper dispersion and better barrier protection than the neat GO. On the other hand, the polyaniline creates an oxide-based passive layer on the metal surface, and besides it reproduces itself through redox reactions. Self-healing is also achievable through rGO decoration with pH-responsive ZIF-9 particles which release inhibitive Co (II) cations and benzimidazole molecules. The fabricated nanostructures' synthesis successfulness was checked via FT-IR, XRD, Raman, ICP, SEM, Zeta potential, and UV-Vis techniques. The ICP as well as solution (NaCl) phase electrochemical analyses achievements confirmed the ZIF-9 @PA-rGO nano-hybrid pH-sensitive properties with outstanding control release potency with a total resistance of 7430 Ω.cm2 (inhibition efficiency: 80%). After revealing the anticorrosion impact of ZIF-9 @PA-rGO in saline solution, the particles were incorporated into the epoxy coating (EC) for further analysis. Records clarified that the inclusion of ZIF-9 @PA-rGO nano-hybrid into the scratched epoxy coating resulted in 120066 Ω.cm2 (inhibition efficiency:84%) in the best situation, evidencing the unique shelf-healing performance of the coating. Simultaneously, the electrochemical studies were applied to the intact coatings and the results declared that the film resistivity of ZIF-9 @PA-rGO/EC reached around 16 GΩ.cm2. Besides the delamination and destruction indexes descended to 10% and 36%, respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
