Polyaniline, poly(N-methylaniline) and poly(aniline-co-N-methylaniline) coatings on stainless steel

ÖZYILMAZ A. T., Akdag A.

Transactions of the Institute of Metal Finishing, cilt.89, sa.4, ss.215-224, 2011 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 89 Sayı: 4
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1179/174591911x13077162170188
  • Dergi Adı: Transactions of the Institute of Metal Finishing
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.215-224
  • Anahtar Kelimeler: Coatings, Conducting polymers, Corrosion resistance, EIS, SEM
  • Hatay Mustafa Kemal Üniversitesi Adresli: Evet

Özet

Polyaniline (PANI), poly(N-methylaniline) (PNMA) and poly(aniline-co-N- methylaniline) (PANI-co-PNMA) coatings were synthesised on stainless steel (SS) surface (AISI 316) in two different supporting solutions, oxalic acid and sulphamic acid. PNMA and PANI-co-PNMA films failed to be synthesised in sulphamic acid solution. Homo- and copolymer films were achieved as homogenous and adherent structures as shown in scanning electron images. Electrochemical corrosion properties of homo- and copolymer films were investigated in 3?5% NaCl solution by electrochemical techniques including a potentiodynamic method and ac impedance spectroscopy. Potentiodynamic studies proved that the PNMA coating had a better electroactive structure in comparison with homo- and copolymer coatings. The results showed that homo- and copolymer coatings exhibited an effective barrier property on a SS electrode and a remarkable anodic protection to the substrate for a longer exposure time. A superior corrosion protection property was obtained by PNMA coating by providing enhanced catalytic efficiency for the formation of protective oxide layers on the metal surface. © 2011 Institute of Metal Finishing Published.