Polymerization

Dielectric spectroscopy

Engineering

Oxide

Electrochemistry

Metallurgy

Materials science

Graphene

Coating

Layer (electronics)

Polyaniline

Chemical engineering

Salt spray test

Physical chemistry

Polymer

Nanotechnology

Composite material

Corrosion

Chemistry

Scanning electron microscope

Electrode

Polyurethane

Fourier transform infrared spectroscopy

Passivation

Progress in Organic Coatings

In order to improve the service life of steel in harsh environment, functionalized graphene oxide (FGO)/polyaniline (PANIPA) nanocomposites with effective synergistic enhancement of corrosion resistance were prepared by in-situ redox polymerization in phytic acid (PA) solution. The structure and surface morphology of GO, FGO and FGO/PANIPA composites were characterized by Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), atomic force microscope (AFM), and ultraviolet-visible spectrophotometry (UV–vis). The corrosion protection property of FGO/PANIPA containing coating on mild steel was investigated by electrochemical impedance spectroscopy (EIS) technique in 3.5 % sodium chloride solution. The results confirmed that the WPU composite coating with FGO/PANIPA additive had a high corrosion resistance in the long term. Under the optimum conditions, where FGO accounted for 2.5 % of PANIPA, it had excellent long-term corrosion resistance due to the synergistic effect of the barrier effect of GO, the passivation mechanism of PANI and the Chelation of phytic acid in the coating.

Preparation of graphene oxide-based polyaniline composites with synergistic anticorrosion effect for waterborne polyurethane anticorrosive coatings