Electrochemical and anti‐corrosion behaviors of water dispersible graphene/acrylic modified alkyd resin latex composites coated carbon steel

Abstract

A type of water dispersible graphene (PG) has been synthesized by nucleophilic ring‐opening reaction of the primary amine group in 3‐(1‐(2‐aminopropoxy) propan‐2‐ylamino) propane‐1‐sulfonate sodium (PPS) with epoxy groups on the basal plane of graphene oxide (GO), followed by in situ reduction with hydrazine hydrate. The PG is employed as nanoscale reinforcement fillers in waterborne acrylic modified alkyd resin (AMAR) coatings. The stability and corrosion resistance of the waterborne PG/AMAR nanocomposite coatings are investigated. SEM and stability of nanocomposite indicated that the PG sheet is uniformly distributed in AMAR nano‐emulsion. Potentiodynamic polarization and electrochemical impedance spectroscopy studies indicated that the PG/AMAR composite coatings exhibit higher corrosion resistance in simulated body fluid (SBF) compared with pure AMAR coatings and GO/AMAR coatings. In addition, the stability and corrosion resistance of the composite materials reach optimum when the PG content is 1%. PPS functionalized graphene (PG) displays prospective application in anticorrosion field. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44445.

Preparation, characterization, and properties of graphene oxide/urushiol-formaldehyde polymer composite coating

“…22,23 Further investigation would be needed to explore the mechanism in detail. In this work, comparing the results with other studies reported in the literature, 13 it was found that MPS grafting onto the GO surface was able to decrease the settling velocity of the GO suspension and GO spatial distributions might have a great significance for the suspension stability. As a result, MPS was chosen as a chemical modified additive since it played an important role in subsequent interfacial interaction on the surface of UFP and graphene oxide.…”

“…In this work, increasing GO content to 2% had a significant effect on accelerating the corrosion rate of the MGO/UFP composite coatings because of poor film-forming ability, hard dispersion property of GO and weak adhesion to the metallic substrate. 13,15…”

“…8) of the GO/UFP and MGO/UFP composite samples with, respectively, log |Z| vs. log frequency and imaginary impedance vs. real impedance as axes. 13 The GO/UFP and MGO/UFP composite samples were tested after immersion in 3.5 wt% NaCl solution for different times. 30 In Nyquist plots (Figs.…”

“…Physical dispersing methods such as ultrasonic dispersion can improve the dispersion of graphene in polymer to some extent. 13 Comparatively, chemical modification cannot only suppress the stacking and aggregation of GO, but also overcome the shortcoming of poor compatibility with polymers. To date, the modification of GO by grafting of chemical groups using silane such as vinyltris(2-methoxyethoxy)silane (TMEVS), 3-aminopropyltrimethoxysilane (APS), (3aminopropyl)triethoxysilane (APTES), c-(2,3epoxypropoxy)propyltrim-ethoxysilane (GPTMS), and 3-methacryloxypropyltrimethoxysilane (MPS) has been applied in the preparation of nanocomposite.…”

Developing a new method for synthesizing amine functionalized g-C3N4 nanosheets for application as anti-corrosion nanofiller in epoxy coatings

“…The Bode plots, exhibit high frequency region due to the coating capacitance and low frequency region due to charge transfer processes occurring at solution/coating interface. Since presenting electrochemical impedance spectroscopy results by Nyquist and Bode plots are a common way for exploring the corrosion resistance of coating systems [44][45][46][47], these plots are presented and discussed in this research. 6 and 7 show the Bode and Nyquist diagrams of mild steel substrate coated with pure epoxy and epoxy/AF g-C 3 N 4 coatings after immersion in 3.5 wt% NaCl solution for 2 h, 24 h, and 48 h, respectively.…”