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

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 salty corrosive 3 % NaCl solution. The anti-corrosion coating based on these composite materials display barrier properties against corrosion causing agents and show corrosion protection efficiency of 84.39 %, compared with uncoated. The material showed lower value of corrosion current (Icorr) that is 2.56 μA cm-2 and 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 corrosion protection ability on mild steel against the corrosive species.