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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 Electrochemical synthesis of poly (aniline-co-o-anisidine) coatings on brass: corrosion protection properties(Taylor & Francis Ltd, 2009) Ozyilmaz, A. T.; Ozyilmaz, G.; Colak, N.Poly (aniline-co-o-anisidine) films were coated on Cu-40% brass electrodes using cyclic voltammetric conditions in a sodium oxalate solution with 0.06M aniline and 0.06M o-anisidine monomers at applied scan rates of 20 and 50 mV s(-1). Using this procedure, the surface of the electrodes was clearly covered with a black copolymer layer of strongly adherent homogeneous characteristics. In order to evaluate the corrosion performance of copolymer coated (CuZn/PANI-co-POA) and uncoated electrodes in 3.5% NaCl, AC electrochemical impedance spectroscopy, anodic polarisation plots and open circuit potential-time curves were used. The copolymer films exhibited significant protection efficiency against the attack of corrosive agents and reduced drastically the corrosion rate of the brass.Öğe Electropolymerization of poly (aniline-co-o-anisidine) on copper and its anticorrosion properties(Iop Publishing Ltd, 2008) Ozyilmaz, A. T.Poly(aniline-co-o-anisidine) of copolymer coatings was synthesized on the copper surface (Cu) with two different amounts of p-toluenesulfonic acid (p-TSA) added to the aqueous sodium oxalate (NaOX) solution. The copper substrates in NaOX solutions containing p-TSA acid had a fairly reliable passive surface mainly due to the formation of copper (II) oxalate layer. The addition of p-TSA acid to the working electrolyte contributed to both the amount of copolymer deposition (growth) and that of copolymer coated per unit time of electropolymerization (growth rate). The growth of copolymer coating on Cu electrode was characterized by scanning electron microscopy. The corrosion performances of copolymer coatings were investigated in 3.5% NaCl solution with anodic polarization curves and electrochemical impedance spectroscopy. The results showed that p-TSA acid led to the diminishing of the permeability of the copolymer films. The copolymer coatings exhibited an effective barrier property on copper electrode and a remarkable anodic protection to substrate for longer exposure time.Öğe Glucose Oxidase-polypyrrole Electrodes Synthesized in p-Toluenesulfonic Acid and Sodium p-Toluenesulfonate(Pleiades Publishing Inc, 2011) Ozyilmaz, G.; Ozyilmaz, A. T.; Can, F.Amperometric glucose biosensors have been developed based on entrapment on platinum (Pt) electrode using cyclic voltammetry technique in glucose oxidase (GOD) and pyrrole containing p-toluene-sulfonic acid (pTSA) or sodium p-toluenesulfonate (NapTS) as supporting electrolyte solutions. Both of electrolyte solutions were suitable media for the formation and deposition of polypyrrole-GOD (PPy-GOD) layers on Pt substrate. Pt/PPy-GOD electrodes brought about in different morphological properties as well as different electrochemical and biochemical response. The highest responses obtained in pTSA and NapTS electrolytes were observed at pH of 4.5 and 7.0 for Pt/PPy-GOD electrodes, respectively. While linearity was observed between 0.0-1.0 mM glucose substrate for both electrodes, I-max value of Pt/PPy-GOD(NapTS) electrode was approximately twice as high as that of Pt/PPy-GOD(pTSA) electrode as 25.4 and 14.2 mu A, respectively. Five commercial drinks were tested with enzyme electrodes and compared with results obtained spectrophotometrically using glucose kit. Results revealed that Pt/PPy-GODNapTS electrode exhibited better biosensor response.Öğe Novel synthesis medium for poly(aniline-co-o-anisidine)(Elsevier Science Sa, 2006) Ozyilmaz, A. T.; Ozyilmaz, G.; Colak, N.Aqueous sodium oxalate (NaOX) solutions both without (1) and with (2) p-toluenesulfonic acid (p-TSA) were used to synthesize a poly (aniline-co-o-anisidine) (PANI-co-POA) film on mild steel (MS). Polarization of the substrate in p-TSA containing NaOX solution mixture led to the passivation of the surface mainly via the formation of an iron(II) oxalate layer. Copolymer coatings showed that p-TSA+NaOX solution mixture was a suitable medium for the deposition of a uniform, compact and strongly adherent PANI-co-POA coating on MS electrode. Similar coating was achieved when NaOX solution was used free of p-TSA. It was observed that addition of p-TSA in NaOX solution provided also an increase in electropolymerization rate. Evaluation of the anticorrosion performance of copolymer coatings in 3.5% NaCl solution was investigated by using AC impedance spectroscopy (EIS) technique and anodic polarization curves. Both copolymer coatings exhibited a significant physical barrier property against the attack of corrosive products on mild steel, in longer periods. (c) 2006 Elsevier B.V. All rights reserved.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.Öğe Synthesis and characterization of poly(aniline) and poly(o-anisidine) films in sulphamic acid solution and their anticorrosion properties(Elsevier Science Sa, 2010) Ozyilmaz, A. T.; Ozyilmaz, G.; Yigitoglu, O.Poly(o-anisidine) (POA) and polyaniline (PANI) coatings were synthesized on platinum (Pt) surface and stainless steel(SS)in monomer containing 0.50 M sulphamic acid (SA) solution by means of cyclic voltammetry (CV) technique. Meanwhile, poly(o-anisidine) film was also deposited with a different scan rate on SS electrode. The behaviour of PANI and POA films obtained on stainless steel examined by CV was different from the one obtained for PAN] and POA on Pt electrode. The corrosion performances of PANI and POA coatings in 3.5% NaCl solution were investigated with anodic polarization technique and electrochemical impedance spectroscopy (EIS). EIS measurements verified the effect of monomers and that of scan rate on corrosion inhibition of coatings on SS electrode. The results showed that POA film synthesized at low scan rate exhibited an effective anticorrosive property on SS electrode. POA synthesized at low scan rate and PANI coatings provided a remarkable anodic protection to SS substrate for longer exposure time than the one observed for POA coating produced at high scan rate as well as that of bare SS electrode. (C) 2009 Elsevier BY. All rights reserved.
