Synthesis of zinc modified poly(aniline-co-pyrrole) coatings and its anti-corrosive performance on low nickel stainless steel

•Zinc modified poly (aniline-co-pyrrole) coating was achieved by electrodeposition on LNSS.•AFM and EDAX results confirm the successful electrodeposition of Zn over copolymer.•The obtained coatings are excellent in terms of low porosity and electrolyte permeability.•The coatings provide both anodic...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2015-01, Vol.465, p.11-19
Main Authors: Govindaraju, K.M., Prakash, V. Collins Arun
Format: Article
Language:English
Subjects:
AFM
Aniline
Atomic force microscopy
Coatings
Corrosion protection
Electrochemical impedance spectroscopy
Nickel
Oxalic acid
Polarization
Poly(aniline-co-pyrrole)
Pyrroles
Stainless steels
Zinc
Zinc deposition
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Summary:•Zinc modified poly (aniline-co-pyrrole) coating was achieved by electrodeposition on LNSS.•AFM and EDAX results confirm the successful electrodeposition of Zn over copolymer.•The obtained coatings are excellent in terms of low porosity and electrolyte permeability.•The coatings provide both anodic and cathodic protection to the alloy.•This coating has good barrier effect against the attack of corrosive agents. Copolymer of poly(aniline-co-pyrrole) film was electrodeposited on low nickel stainless steel (LN SS) substrate from 0.1M monomers (aniline and pyrrole) containing aqueous oxalic acid solution. The coatings were synthesized by means of cyclic voltammetric technique. Then, the polymer coatings were modified by depositing zinc particles over it by potentiodynamic cathodic sweeps. The corrosion performance of zinc modified poly(aniline-co-pyrrole) coatings was investigated in 1M HCl solution, using potentiodynamic polarization and electrochemical impedance spectroscopic techniques. It was shown that the zinc modified poly(aniline-co-pyrrole) coatings exhibited a very low permeability and provided better corrosion protection to LN SS. This enhanced stability and better barrier properties may be due to the formation of pore free and adherent zinc modified poly(aniline-co-pyrrole) layer. Atomic force microscopy (AFM) and energy-dispersive X-ray analysis (EDAX) were used to study the morphology and coating composition of the LN SS specimen.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2014.10.011