Corrosion protection provided by homo- and copolymer films synthesised in various oxalic and sulphamic acid electrolyte mixtures
Yükleniyor...
Tarih
2013
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Aqueous mixtures of oxalic acid (OX) and sulphamic acid (SA) solutions at different concentrations were used to synthesise polyaniline (PANI), poly(N-methylaniline) (PNMA) and poly(aniline-co-N-methylaniline) (PANI-co-PNMA) films on stainless steel (SS) surface (AISI 316). Variation in the OX/SA ratio affected the PANI, PNMA and PANI-co-PNMA growth rates, leading to film formation with different redox and structural properties, which contributed to their protection efficiency against the SS corrosion. Study of homo- and copolymer coatings proved that equal volume of 0.30M OX and 0.50M SA solution mixture was a suitable medium for the deposition of uniform, compact and strongly adherent coatings on SS electrode. It was observed that addition of SA to OX solution also provided an increase in electropolymerisation rate. Evaluation of the anticorrosion performance of homo- and copolymer coatings in 3.5%NaCl solution was investigated by using ac impedance spectroscopy technique and anodic polarisation curves. Polyaniline coatings exhibited a significant physical barrier property against the attack of corrosive products on SS, over longer periods.
Açıklama
Anahtar Kelimeler
Corrosion, Impedance spectroscopy, Copolymer, Monolayer, Stainless steel, Mixture electrolyte solution
Kaynak
Transactions of The Institute of Metal Finishing
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
91
Sayı
1
