Graphene oxide-based polyaniline composites

Scientists have described the preparation of graphene oxide-based polyaniline composites with synergistic anticorrosion effect for waterborne polyurethane anticorrosive coatings.

Drops on an alumium surface as a symbolic image.
According to the researchers Image source:  avi_acl - Pixabay (symbol image).

In order to improve the service life of steel in harsh environment, functionalised graphene oxide (FGO)/polyaniline (PANIPA) nanocomposites with effective synergistic enhancement of corrosion resistance were prepared by in-situ redox polymerisation in phytic acid (PA) solution.

The structure and surface morphology of GO, FGO and FGO/PANIPA composites were characterised by Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), atomic force microscope (AFM), and ultraviolet-visible spectrophotometry (UV–vis).

Long-term corrosion resistance

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.

The study has been published in Progress in Organic Coatings, Volume 156, July 2021.

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