Fabrication and Evaluation of Mechanical and Anti-corrosion Properties of Epoxy Resin/Carbon Nanofibers Containing Organic Corrosion Inhibitors

Ghaderi, Mohammad | 2022

268 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55264 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadat Abadi, Ahmad; Mahdavian Ahadi, Mohammad
  7. Abstract:
  8. To protect mild steel against corrosion, an intelligent self-healing epoxy (EP) coating including carbon nanofiber (CNF) modified with polydopamine (PDA)-La (III) complex was successfully fabricated. The high aspect ratio and unique thermal and electrical characteristics of CNF made it an ideal physical barrier against the penetration of corrosive ions. Due to the poor dispersion of CNF, its surface was modified using PDA. PDA, which contains functional groups such as catechol, amine, and imine, can mitigate corrosion reaction by generating the Fe-Catechol complex and also boost the coating's adherence to the metal surface, in addition to anchoring La3+ inorganic corrosion inhibitor. Interestingly, variations in PDA surface charge at different pHs resulted in the release of PDA under alkaline conditions and the release of La3+ ions under acidic ones. Due to local pH stimulation at the anodic and cathodic sites, the on-demand release of this green organic-inorganic inhibitor at the scratch site enhanced total corrosion resistance after 10 h of immersion by 117 % compared to the coating without nanopigments (NPs). The salt spray test results also exhibited the coating's superior anti-corrosion capabilities after 20 days.
  9. Keywords:
  10. Corrosion ; Polydopamine ; Coating ; Lanthanum ; PH-Sensitive Polymer ; Carbon Nanofiber ; Epoxy Resin ; Anticorrosive Coating

 Digital Object List