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Corrosion protective poly(aniline-co-o-anisidine) coatings on mild steel

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Abstract

Syntheses of corrosion protective poly(aniline-co-o-anisidine) (PAOA) coatings were carried out on mild steel by the electrochemical copolymerization of aniline with o-anisidine under cyclic voltammetry conditions. An aqueous salicylate solution was used as the supporting electrolyte for the synthesis of PAOA coatings on mild steel. These coatings were characterized with cyclic voltammetry, ultraviolet–visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and scanning electron microscopy. The FTIR and 1H-NMR spectroscopy studies reveal that during copolymerization of aniline and o-anisidine, there are more o-anisidine units than aniline units in PAOA copolymer. The corrosion protection offered by PAOA coatings to mild steel was investigated in aqueous 3% NaCl solutions using the potentiodynamic polarization technique. The results of the potentiodynamic polarization measurements showed that the PAOA coatings provided more effective corrosion protection to mild steel than the respective homopolymers. The corrosion rate was observed to be dependent on the feed ratio of o-anisidine used for synthesis of the copolymer coatings.

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Acknowledgments

Authors would like to acknowledge UGC for the financial support via minor research project. The first author would also like to acknowledge Prof. P. P. Patil from North Maharashtra University specially for providing the lab for synthesis and testing the corrosion performance of samples as well as for the co-operative environment during this work.

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Authors and Affiliations

  1. MGSM’s Arts, Science and Commerce College, Dist-Jalgaon, Chopda, 425107, Maharashtra, India

    Pritee M. Raotole & S. R. Patil

  2. Center for International Cooperation in Engineering Education (CICEE), The University of Tokushima, 2-1, Minamijosanjima-cho, Tokushima, 770-8506, Japan

    Pankaj Koinkar

  3. Department of Materials Science and Engineering, Jimma University, Jimma, 378, Ethiopia

    Bhavana Joshi

Authors
  1. Pritee M. Raotole
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  2. Pankaj Koinkar
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  3. Bhavana Joshi
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  4. S. R. Patil
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Correspondence to Pritee M. Raotole.

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Raotole, P.M., Koinkar, P., Joshi, B. et al. Corrosion protective poly(aniline-co-o-anisidine) coatings on mild steel. J Coat Technol Res 12, 757–766 (2015). https://doi.org/10.1007/s11998-015-9669-0

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