Graphene Oxide/Polyaniline Nanocomposites Used in Anticorrosive Coatings for Environmental Protection

Abstract

In recent years, metal corrosion causes serious threats to the economy of the world and the living environment. Hence, it is very important to seek non-toxic and environmentally friendly materials with metal anti-corrosion properties for the sustainable development of society. The barrier properties of graphene oxide (GO) and the special electrochemical property of polyaniline (PANI) can significantly improve the corrosion resistance of metals. Herein, we developed an in-situ polymerization method to prepare graphene oxide/polyaniline (GO/PANI) nanocomposites with unique anti-corrosion properties. The obtained GO/PANI nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermalgravimetric analysis, UV–vis spectroscopy and scanning electron microscopy. The as-prepared composite materials were uniformly dispersed in epoxy resin to prepare anticorrosive coatings and coated on the surface of steel. The anti-corrosion performance of the coatings was measured by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization technique. The EIS results showed that the total impedance of epoxy/GO/PANI coatings is greater than epoxy/PANII coatings, and the impedance module value can reach 8.67 × 108 Ω·cm2. In general, it is concluded that the anti-corrosion performance of GO/PANI coating is significantly higher than PANI coating and pure GO coating.

Polyaniline decorated graphene oxide on sulfonated poly(ether ether ketone) membrane for direct methanol fuel cells application

“…The epoxide group of ether C O C peak was also seen in the wavenumber of 1059 cm À1 . 38 As seen in Figure 3B, the prominent peaks in the PANI-GO nanocomposite were diminished due to aniline polymerization. The PANI groups of N H, C H, and C═C were observed at the wavenumber of 3375, 1570, and 1119 cm À1 , respectively.…”

Preparation and Characterization of Graphene Oxide/Polyaniline/Carbonyl Iron Nanocomposites

“…where K is 3268.5 (mol/A), M is the molecular weight of iron 56 (g/mol), ρ is the density of iron (7.85 g/cm 3 ), V is the valence of iron [41], and the corrosion rate is proportional to the corrosion current. The PANI coating and GO-PANI coating have smaller corrosion currents: 1.99 × 10 −9 A/cm 2 and 1.67 × 10 −9 A/cm 2 , respectively.…”

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

“…In the past few years, the conductive polymers have been increasingly employed as the additive filler in organic coatings to improve metallic anticorrosion ability, which has become a research hotspot [18]. The conductive polymers are normally constituted by conjugated electronic structures, accordingly exhibiting certain performances of both semiconductors and traditional polymers [8].…”

“…Among all the conducting polymers, polyaniline (PANI), polypyrrole (PPY), polyindole and polythiophene are more potential in the application of metallic anticorrosion [8]. And, PANI is the most fascinated by its easy preparation, environmental harmony, chemical and thermal stability, low cost, electrical conductivity, reversible redox properties and unique doping characteristics [14,18]. Hence, PANI has been extensively used in the anticorrosive composite coatings.…”

“…However, it is difficult to obtain high solubility or dispersibility of conductive polymers in the polymeric coating matrix [17]. Likewise, PANI is easy to agglomerate in the matrix [18]. Undoubtedly, lower dispersibility of PANI in the matrix will result in worse anticorrosive performance of composite coatings.…”