Polyaniline modified attapulgite incorporated in alkyd paint for carbon steel corrosion inhibition

ABSTRACT

In the present work, polyaniline (PANI) modified attapulgite (ATP) nanocomposite was synthesized and employed as reinforcements to enhance the corrosion resistance of the alkyd coating. The morphological and structural properties of the synthesized ATP/PANI were characterized by transmission scanning electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion protection performance of the alkyd coatings, showing the improved corrosion resistance in the presence of the ATP/PANI nanocomposite. Scanning Kelvin probe (SKP) and Raman spectroscopy were performed to characterize the metal passivation inhibition ability of composite coatings. Compared with blank coating, the SKP results revealed a clear decrease in electrochemical activity at the scratch of ATP/PANI coating. Results from Raman spectrum indicated that the protective capability of the scratched coating can be recovered through the passivation of polyaniline to form stable oxide film (Fe₂O₃) on metal surface.

KEYWORDS:

• Polyaniline
• attapulgite
• scanning Kelvin probe
• alkyd coating
• corrosion protection

Acknowledgements

The authors are grateful to Luoyang Ship Material Research Institute for the financial support for this research work and permission to publish this paper.

Disclosure statement

No potential conflict of interest was reported by the author(s).