Abstract
Polypyrrole nanowires/graphene (PPyNG) nanocomposites as anticorrosive fillers were prepared by in situ polymerization in order to improve the anticorrosion performance of waterborne epoxy coatings. Field emission scanning electron microscope (FESEM) and Fourier transform infrared spectroscopy (FTIR) characterized the morphologies and structures of the synthesized PPyNG. The polypyrrole nanowires with about 50 nm in diameter were obtained. Conjugation length of PPy was increased with the addition of graphene. Open circuit potential (OCP) measurements, Tafel polarization curves, and electrochemical impedance spectroscopy (EIS) using an electrochemical workstation evaluated the anticorrosion properties of the waterborne epoxy/PPyNG coatings (EPPyNG). The studied nanocomposite coating possessed superior corrosion protection performance when the graphene content of the filler was 2 wt %. Its corrosion rate was about 100 times lower than that of neat epoxy coating. The higher barrier properties of nanocomposite coating and passivation effect of polypyrrole nanowires were beneficial in corrosion protection.
Highlights
Metal corrosion is a disturbing phenomenon in which chemical or electrochemical reactions damage metal materials
When comparing to the Fourier transform infrared spectroscopy (FTIR) spectra of PPy nanowires (PPyN), all peaks had appeared in the PPy nanowires/graphene nanocomposites (PPyNG) nanocomposites
It was worth noting that the C–N stretching vibrations peak of PPyNG nanocomposites had been downshifted to 1310 cm−1, which was probably due to the π–π interactions between graphene layers and aromatic polypyrrole rings [34]
Summary
Metal corrosion is a disturbing phenomenon in which chemical or electrochemical reactions damage metal materials. It would result in economic losses, and threaten the safety of industrial production. Polymer coatings are the most common approach for protecting metal surface from corrosion due to their low cost and high anticorrosion performance. Epoxy coatings have attracted many researchers due to their strong adhesion to substrates and excellent mechanical properties. Even these coatings fail over prolonged exposure in corrosive media [4]. Many researchers have investigated polymer composites incorporating various functional fillers [5], such as montmorillonite [6], carbon nanotubes [7], graphene [8], and intrinsically conducting polymers (ICPs) [9], to overcome this problem
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