Electrochemical Synthesis of Bilayer Coatings of New Polymer Composite for Carbon Steel Corrosion Protection

 

 

Bi-layered composites of polydimethylaniline (PDMA) and polypyrrole (PPY) were investigated for corrosion protection of carbon steel. In this work, PNDMA, PPY and PNDMA-AOT/ PPY coatings have been electropolymerization on carbon steel by potentiodynamic and galvanostatic synthesis techniques from aqueous solutions 0.1 M dimethylaniline, 0.1M pyrrole, 0.05 M sodium dioctyl sulfosuccinate (AOT) and 0.3 M oxalic acid. In order to include dioctyl sulfosuccinate ions as dopant in the dimethylaniline, AOT was also added to the polymerization solution of dimethylaniline. Characterization of monolayer and bilayer polymer coatings was carried out by cyclic voltammetry, Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) techniques. Corrosion behaviour of PDMA-AOT/PPY coated carbon steel was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques in 0.5M H₂SO₄solutions. The results of the corrosion tests showed that PDMA-AOT/PPYI coatings ensure good corrosion protection of carbon steel in aggressive media. Bilayer coatings revealed better corrosion inhibition efficiencies than monolayer coatings

 

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