Sambyal, Pradeep and Ruhi, Gazala and Mishra, Monu and Gupta, Govind and Dhawan, Sundeep K. (2018) Conducting polymer/bio-material composite coatings for corrosion protection. Materials and Corrosion / Werkstoffe und Korrosion, 69 (3). pp. 402-417. ISSN 0947-5117

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Abstract

Present study demonstrates a facile in situ oxidative copolymerization method to synthesize conducting copolymer composites in aqueous chitosan medium. The development of poly(aniline-co-o-toluidine)-chitosan-SiO2/epoxy composite coatings were carried out by thermal curing of the spray-coated mild steel substrates. FT-IR analysis, XRD studies, SEM and HR-TEM evidenced that the composite has synergistically integrated properties of the copolymer and the SiO2 nanoparticles. The electrochemical analyses of the coatings in 3.5% NaCl solution manifest an efficient role of copolymer composite in the remarkable improvement of the corrosion resistance of the substrate. The analyses involve Tafel polarization and electrochemical impedance spectroscopy (EIS) studies. The corrosion inhibition property of conducting copolymers, the film forming ability of chitosan, and robustness of SiO2 nanoparticles kept the corrosion rate of the coatings significantly low, under highly corrosive conditions. Mild steel coated with 3.0% loading of copolymer composite coating demonstrated very low corrosion current density (i(corr)) and significantly high pore resistance (R-pore).

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Wiley.
Subjects:	Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	04 Dec 2019 07:28
Last Modified:	04 Dec 2019 07:28
URI:	http://npl.csircentral.net/id/eprint/3877

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