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Conducting polymer/bio‐material composite coatings for corrosion protection
Author(s) -
Sambyal Pradeep,
Ruhi Gazala,
Mishra Monu,
Gupta Govind,
Dhawan Sundeep K.
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709554
Subject(s) - materials science , tafel equation , corrosion , copolymer , composite number , dielectric spectroscopy , composite material , coating , curing (chemistry) , polymer , chemical engineering , aqueous solution , nanoparticle , electrochemistry , nanotechnology , organic chemistry , chemistry , electrode , engineering
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–SiO 2 /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 SiO 2 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 SiO 2 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 ).