High-performance Engineered Conducting Polymer Film towards Antimicrobial/Anticorrosion Applications (original) (raw)
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Microbial-induced corrosion (MIC) is an electrochemical form of corrosion that is initiated, facilitated, or accelerated by bacteria and biofilms on the metal substrate. Coating methods have been widely used to inhibit MIC because of their effectiveness, ease of application and low cost. Conventional coatings for MIC inhibition are based on heavy metals such as tin, copper, and zinc; however, these coatings are toxic to the environment. Recently, environmentally friendly coatings were developed to overcome MIC problems. Among these new coatings, studies have focused on conductive polymers, which have both antibacterial and anticorrosive properties. The biocidal and anticorrosive properties of conductive polymers make them appropriate coatings for MIC inhibition. This research project is aimed to study and compare the behaviour towards MIC of four types of conductive polymer coatings namely, polyaniline nanofibres, polyaniline-silver nanocomposite, polyaniline-carbon nanotube, and po...
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In this study, the corrosion parameters of stainless steel containing 12% Cr, have been determined by Tafel extrapolation method in 1 M HCl, H 2 SO 4 and H 3 PO 4 media. Later, steel was coated with polypyrrole in 0.1 M Pyrrole + 0.3 M Oxalic acid solution by cyclic voltametric method. The corrosion parameters and percentage inhibition efficiencies of coated electrodes were investigated according to immersion times in the same media. In all acidic media studied, increases in immersion time, produced increased corrosion densities and a decrease in percentage inhibition efficiencies were determined.
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Corrosion Science, 2006
40 was electrosynthesised on carbon steel electrodes in acetonitrile medium. Passivation pretreatment of carbon steel in acetonitrile/perchlorate medium was used to avoid electrodissolution of electrode during the polymerisation. These hybrid coatings were evaluated against corrosion in chloride-containing 0.05 M NaOH and solutions obtained by filtering Portland cement slurries. Cyclic voltammetry, polarisation resistance (R p ), and Fe 2+ concentrations measurements showed that the obtained coatings provide good protection against corrosion in chloride-containing media.
Poly (N-Imidazolylmaleamic acid) PIM was synthesized from monomer (N-Imidazolylmaleamic acid) NIMin aqueous solution using electrochemical oxidation procedures. The polymer film was formed on Stainless steel electrodes (working electrode). Its structure has been examined by infrared, FTIR, scanning electron microscopy SEM and atomic force microscopy AFM studies indicate that the polymer was formed. Also, study the anticorrosion action of polymer film on stainless steel by electrochemical polarization method.Furthermore, enhanced the anticorrosion of polymerby nanomaterial such as (TiO 2 and ZnO (bulk-nano)) by adding to monomer solution. The results obtained showed that the corrosion rate of S-steel increased with temperature increase from 293K to 323K and the values of inhibition efficiency by coating polymer increase with nanomaterial addition. Kinetic and thermodynamic of activation parameters have been calculated for the corrosion process of S-steel in acidic medium before and after polymeric coating.Furthermore were studied the effect of the preparing polymer on some strain of bacteria.
Electrochimica Acta, 2011
Homopolymer and bilayer coatings of poly(N-methylaniline) (PNMA) and polypyrrole-dodecylsulfate (PPy-DS) have been electropolymerized on a mild steel (MS) surface by the potentiodynamic method in aqueous oxalic acid solutions. In order to include dodecylsulfate ion as dopant in the polypyrrole, sodium dodecylsulfate was also added to the polymerization solution of pyrrole. Characterization of coatings was carried out by the cyclic voltammetry, Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FESEM). Corrosion behavior of the polymer coated MS electrodes was investigated in highly aggressive 0.5 M HCl solution by the Tafel test and electrochemical impedance spectroscopy (EIS) techniques. Corrosion test revealed that among the protective coatings obtained, the PNMA/PPy-DS bilayer exhibited the best corrosion resistance at all immersion times.
Progress in Organic Coatings, 2014
This article presents a study of the conditions for electro-synthesis of polypyrrole (PPy) films on stainless steel, in the presence of the anions p-toluene-sulfonate (pTS), benzene-sulfonate (BS) or dodecyl-sulfate (DS). Cyclic voltammetry (CV) was used in the synthesis of the polypyrrole films on the stainless steel (SS). These polymeric films were characterized by IR and UV-vis spectroscopy and their morphology and thickness were analyzed by scanning electron microscopy (SEM). Their performance as protective films against corrosive processes presented by the SS/PPy-pTS, SS/PPy-BS or SS/PPy-DS systems was evaluated in 0.1 M NaCl aqueous solution. The study of the corrosion processes of the stainless steel/polymer systems was conducted through measurements of open circuit potential (E OCP), polarization curves (PC) and electrochemical impedance spectroscopy (EIS). The results showed that the protective capacity of these polymeric systems on stainless steel, mainly with regard to pitting, depends on the nature of the anion dopant used during electro-synthesis of the PPy film. The best performance was seen with the dopants pTS and BS.