Electropolymerized bilayer coatings of polyaniline and poly(N-methylaniline) on mild steel and their corrosion protection performance |
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Authors: | B Narayanasamy S Rajendran |
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Affiliation: | 1. Department of Chemistry, Thiagarajar College of Engineering, Thirupparankunram, Madurai 625015, India;2. Department of Chemistry and Corrosion Research Center, GTN Arts College, Dindigul 624005, India |
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Abstract: | Polyaniline (PANI) and poly(N-methylaniline) (PNMA) have been electrodeposited on mild steel from oxalic acid bath using cyclic voltammetric technique. Pretreatments like passivation and primer polymer coatings were required for effective coating. Differently stacked composite polymer layers on the metal surface by layer-by-layer approach have also been obtained and their properties have been compared with their corresponding copolymer coatings. FTIR study confirms the formation of electroactive polymer compounds on mild steel. Evaluation of these coatings in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy reveals significant corrosion resistant behavior. Relatively higher corrosion protection is exhibited by copolymer coatings and composite-bilayer coatings than the corresponding homopolymer coatings. The composite metal–PANI–PNMA layer shows higher stability and better protection than the metal–PNMA–PANI layer. |
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Keywords: | Bilayer coating Polyaniline Poly(N-methylaniline) Electropolymerization Corrosion protection Mild steel |
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