Corrosion Inhibition Properties of Sulfonated Polyaniline-Poly(Vinyl Alcohol) Composite on Mild Steel

Document Type : Research Article

Authors

1 National Center of Excellence in Physical Chemistry, University of Peshawar, 25120 Peshawar, PAKISTAN

2 Department of Chemistry, Women University, Swabi, PAKISTAN

3 Institute of Chemical Sciences, University of Peshawar, 25120 Peshawar, PAKISTAN

Abstract

In this work, we demonstrate water-based corrosion inhibition properties of engineered sulfonated polyaniline molecules on poly(vinyl alcohol), PANI-PVA, for mild steel. The corrosion-inhibition performances were evaluated using potentiodynamic polarization in a salty corrosive 3 % NaCl solution. The anti-corrosion coating based on these composite materials displays barrier properties against corrosion-causing agents and shows a corrosion protection efficiency of 84.39 %, compared with uncoated. The material showed a lower value of corrosion current (Icorr) which is 2.56 μA/cm2 and a positive shift in corrosion potential (Ecorr), -0.426 V, in comparison with uncoated steel.   Open Circuit Potential (OCP) Studies and electrochemical impedance (EIS) were also carried out to check the corrosion protection ability of the material. OCP studies, Nyquist plot, and Bode plots showed that the synthesized PANI-PVA possess a corrosion protection ability on mild steel against the corrosive species.

Keywords

Main Subjects

References

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Iranian Journal of Chemistry and Chemical Engineering
Volume 41, Issue 4 - Serial Number 114
April 2022
Pages 1313-1321

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