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Chemical Papers

, Volume 71, Issue 8, pp 1515–1528 | Cite as

Graphene oxide-modified polyaniline pigment for epoxy based anti-corrosion coatings

  • Vandana A. Mooss
  • Abhijit A. Bhopale
  • Pravin P. Deshpande
  • Anjali A. Athawale
Original Paper

Abstract

In the present work, a set of polyaniline–graphene oxide (PANI–GO) nanocomposites which exhibit superior properties in terms of shelf life, processability and conductivity due to the synergistic effect of GO and PANI, have been synthesized by varying the concentration of highly non-conducting GO with respect to aniline. The obtained materials were characterized by UV–Vis, FTIR, XRD, Raman, TGA as well as FESEM, TEM analysis. The results reveal that nanocomposites show better dispersibility, crystallinity, thermal stability, and conductivity. Further, the synthesized composites have been tested for their anti-corrosion properties. The potentiodynamic results reveal that PANI nanocomposites with 1% GO exhibited long-term anti-corrosion behavior with a corrosion rate of 6.5 × 10−5 mm year−1, which is much lower than its individual components and commercial-grade red oxide. Also, it possesses highest impedance modulus ~33 kΩ cm2 and real impedance ~32 kΩ cm2, maximum coating resistance ~14.81 × 103 Ω cm2 and minimum coating capacitance after 96 h of immersion in 3.5% mass NaCl than those exhibited by all other coated samples. Higher concentration of GO could not retard the corrosion rate confirming that hydrophilicity of GO play an important role in the redox mechanism of PANI.

Keywords

Polyaniline Graphene oxide Nanocomposites Anti-corrosion properties 

Notes

Acknowledgements

The authors thank Department of Chemistry and Physics for characterization techniques. One of the authors VM thanks SPPU for the financial support. The authors also thank Prof. N.B. Dhokey, Head, Department of Metallurgy and Materials Science, College of Engineering, Pune, 411005 (M.S.), India, for providing facilities for anti-corrosion studies and Prof. B.B. Ahuja, Director, College of Engineering, Pune, 411005 (M.S.), India, for his encouragement.

Supplementary material

11696_2017_146_MOESM1_ESM.docx (530 kb)
Supplementary material 1 (DOCX 530 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2017

Authors and Affiliations

  1. 1.Department of ChemistrySavitribai Phule Pune UniversityPuneIndia
  2. 2.Department of Metallurgy and Materials ScienceCollege of EngineeringPuneIndia

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