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Öğe Anticorrosive properties with catalytic behaviour of primer PANI film and top PPy coating synthesised in presence of novel norephedrine based amino alcohol compound(Taylor & Francis Ltd, 2014) Ozyilmaz, A. T.; Aydin, A. E.; Akdag, A.Polyaniline film as primer coating was deposited on stainless steel ( SS) in aniline containing aqueous oxalic acid solution, and subsequent synthesis of top PPy film with 2-((5-ethylthiophen-2yl) methylamino)-1-phenylpropan-1-ol (AAN) compound of different concentrations was achieved in acetonitrile-LiClO4 successfully. The corrosion performances of coated and uncoated electrodes in 3.5%NaCl solution were evaluated with the help of AC impedance spectroscopy, anodic polarisation plots and open circuit potential time curves. The protective effect of bilayer coatings with AAN compound on SS electrode grew in parallel with extended exposure time. The regular increase in the charge transfer resistance of SS/PANI/PPy-AAN17 electrode was attributed to allowing the limited ion diffusion of top PPy coating with AAN17 compound. The high 21764 Omega s(-1/ 2) value of the Warburg coefficient showed that PPy-AAN17 film on the SS/PANI coating led to the formation of protective oxide layers due to the catalytic behaviour of PANI film.Öğe Corrosion protection provided by homo- and copolymer films synthesised in various oxalic and sulphamic acid electrolyte mixtures(Taylor & Francis Ltd, 2013) Ozyilmaz, A. T.; Akdag, A.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.Öğe Polyaniline, poly(N-methylaniline) and poly(aniline-co-N-methylaniline) coatings on stainless steel(Taylor & Francis Ltd, 2011) Ozyilmaz, A. T.; Akdag, A.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.
