Abstract
The corrosion protective performance of polyaniline/palm oil (PAni-PO) blend coated on mild steel in 3% NaCl aqueous solutions has been evaluated by electrochemical methods, namely, open circuit potential (ocp), potentiodynamic polarization, and EIS spectroscopy. The surface of mild steel was covered by a dark green protective layer due to the physical interaction between the coating and steel. The permanent shifts of ocp and potentiodynamic polarization towards higher positive value of oxidation potential by about 800 mV and by a decrease in corrosion current density by sixfold in magnitude and an increase of 10 orders of magnitude in charge transfer resistance are due to protective coating.
Highlights
Polyaniline has been widely studied as being the most conducting and efficient corrosion inhibitor containing π-bond molecular structure under conjugation [1]
Wessling reported that the dispersions of doped polyaniline acted as corrosion inhibitor for mild steel, stainless steel, and copper were passivated by repeatedly dipping clean surfaces of the metals conditions
The polymer was characterised by recording Fourier Transform Infrared Spectroscopy (FTIR) spectrum using Perkin-Elmer-2000 system (USA) with KBr pellet
Summary
Polyaniline has been widely studied as being the most conducting and efficient corrosion inhibitor containing π-bond molecular structure under conjugation [1]. The pioneer work of DeBerry [2] had studied the elecyrodeposition of polyaniline on mild steel in a strong acid environment and observed the passivation of pure iron by a layer of polyaniline; the corrosion potential was shifted towards the more noble metal. Thompson et al [22, 23] reported significant corrosion inhibition of mild steel exposed to saline (3.5% NaCl) and acidic environment; the working electrode was coated by polyaniline. Polyaniline induces the formation of an oxide layer on mild steel and led the passivation of metal surface [7]. These fascinating results of Thompson and Wessling encourage us to investigate the corrosion protection of mild steel provided by palm oil based coating of polyaniline in saline (3% NaCl) solution. In this paper polyaniline/palm oil blend coatings were applied without using any solvent or resin
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