Synthesis and characterization of polyaniline-based polymer nanocomposites as anti-corrosion coatings

Francisco R. Rangel-Olivares, Elsa M. Arce-Estrada, Román Cabrera-Sierra

Research output: Contribution to journalArticlepeer-review

Abstract

Polymer nanocomposites of polyaniline (PANI)-based metal oxides (SiO2, CeO2, and TiO2 A) were synthesized by in situ chemical oxidative polymerization by rapid mixing in a hy-drochloric acid medium to evaluate and compare their performance as anti-corrosion coatings on commercial 1018 steel in a 3.5% NaCl medium. The anti-corrosion coatings were developed by dis-persing synthesized nanocomposites on an alkydalic resin (AR) for their subsequent electrochemical characterization. X-ray diffraction (XRD) analyses show that PANI has a certain degree of crystallinity in its structure. The incorporation of metal oxide (MO) nanoparticles (NPs) into the polymer matrix was confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS) analyses, while the interaction of nanoparticles with PANI was proven by Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-vis). Thermogravimetric analysis (TGA) reveals that nanoparticles infer greater resistance to the thermal decomposition of PANI. Finally, the use of open circuit potential (OCP) study, Tafel curves, and electrochemical impedance spectroscopy (EIS) showed that coatings made with TiO2 A NPs exhibit the best anti-corrosion properties as compared to those synthesized with SiO2 and CeO2 NPs.

Original languageEnglish
Article number653
JournalCoatings
Volume11
Issue number6
DOIs
StatePublished - Jun 2021

Keywords

  • Anti-corrosion
  • Coating
  • Conducting polymer
  • EIS
  • Nanocomposite

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