Long-term anticorrosion behaviour of polyaniline on mild Steel

Chen, Y.; Wang, X.H.; Li, J.; Lu, Junqiang; Wang, F.S.

doi:10.1016/j.corsci.2006.11.007

Cited by 172 publications

(52 citation statements)

References 22 publications

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“…Other authors have previously described the better performance of coatings obtained from paints containing PAni-EB compared to coatings from paints containing PAni-ES [43,45,53,56]. They attributed this behavior to the formation of a dense and well adherent polymer film.…”

Section: Eis Experimentsmentioning

confidence: 94%

“…However, Araujo et al [55] showed that PAni-EB did not protect steel in 0.01 M Na 2 SO 4 , even with an epoxy topcoat. Chen et al [45] attributed the divergences in the results to the wide variations in the methodology used in the different experiments. Conditions as PAni-EB preparation, PAni-EB mixing, and use or not of a topcoat contribute to the lack of homogeneity between results described by different authors that work in the field of corrosion protection of metals by conducting polymers.…”

Section: E Corr Versus Time Testmentioning

confidence: 99%

“…This phenomenon may not originate merely from the barrier effect of the coatings because the nonconjugated polymers, such as polystyrene and epoxy, did not show the same electrochemical behavior. Chen et al [45] reported that PAni-EB/epoxy resin coating offered efficient corrosion protection of mild steel in 3.5% NaCl solution, especially when the EB content was 5-10%.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical impedance spectroscopy investigation of chlorinated rubber‐based coatings containing polyaniline as anticorrosion agent

Baldissera

Freitas

Ferreira

2010

Materials & Corrosion

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Corrosion protection of mild steel by a newly developed chlorinated rubber (CR)‐based coating system containing the inherently conductive polymer polyaniline (PAni) as an anticorrosion agent was studied. The synthesis of PAni and preparation of CR‐based paint containing this polymer are described herein. The corrosion behavior of mild steel samples coated with a CR resin, CR/PAni‐EB (emeraldine base), CR/PAni‐ES (emeraldine salt), and CR/DBSA‐doped PAni were investigated in 3.5% NaCl solution. For this purpose, electrochemical impedance spectroscopy and corrosion potential versus time measurements were utilized. It was found that the addition of the two forms of PAni, doped and undoped, to the CR resin increased its corrosion protection efficiency.

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Section: Eis Experimentsmentioning

confidence: 94%

Section: E Corr Versus Time Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical impedance spectroscopy investigation of chlorinated rubber‐based coatings containing polyaniline as anticorrosion agent

Baldissera

Freitas

Ferreira

2010

Materials & Corrosion

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“…17,18 Using undoped EB form of PANi is feasible in anticorrosion coatings, especially under mild conditions. 19 The main problem in using this form of PANi is that the EB is not soluble in epoxy resins. Solubility and processibility are needed when conducting polymers are used in coating applications.…”

Section: Introductionmentioning

confidence: 99%

A new approach to using submicron emeraldine-base polyaniline in corrosion-resistant epoxy coatings

et al. 2011

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The present work reports on a new approach to the preparation of special corrosionresistant epoxy coatings. The aminic hardener of these coatings contained emeraldine-base polyaniline (EB-PANi). The aminic hardener was prepared by dispersion of EB-PANi in 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine employing sonication, centrifuging and submicron filtering methods. The state of dispersion and dissolution of these coating materials, during different stages of preparation, were characterized by optical microscopy and scanning electron microscopy. The corrosion resistances of resulting coatings were measured by electrochemical impedance spectroscopy (EIS) and salt spray methods. As little as 0.5% EB in initial mixture of EB-hardener compositions led to relatively better corrosion protection of resulting coating compared with neat resin coating. Presence of initial 2.5% of EB in the hardener and its processing through our approach resulted in the formulation of an epoxy coating with superior corrosion protection properties.

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“…The conducting polymers, which possess the electronic properties of semiconductors and processing advantages of conventional polymers, have widely been studied for corrosion protection during the last few years. Since the first reported work on the corrosion protection of metals using conducting polymers in 1981 [4], a large number of studies with focus mainly on polyaniline [5][6][7][8][9][10] and polypyrrole [11][12][13][14][15] have been carried out. Nevertheless, the polyaniline is more challengeable due to low cost of aniline monomers as compared to pyrrole, its environmental stability and the easy solution processing.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Chemically Deposited Single and Bi-layered Conducting Polymer Coatings on Mild Steel

Mobin

Tanveer

2011

Port. Electrochim. Acta

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The emeraldine base (EB) was synthesized by chemically oxidative polymerization using ammonium persulphate as an oxidant in hydrochloride aqueous medium. The polymer was chemically deposited on mild steel specimens using tetra methyl urea (TMU) as solvent through solvent evaporation method. The coating of polypyrrole (PPy) on carbon steel was deposited by chemical polymerization. A bi-layered polymer coating comprising of inner coat of PPy with top coat of EB (PPy/EB) was also deposited on mild steel following identical procedure. The deposited EB, PPy and PPy/EB coatings were characterized by Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM). The anticorrosive properties of single and bi-layered coatings was investigated in major corrosive environments such as 0.1 M HCl, 5% NaCl solution, artificial seawater, distilled water, tap water and open atmosphere by conducting various corrosion tests which include: immersion test, open circuit potential measurements, potentiodynamic polarization measurements, and atmospheric exposure test. The results of immersion tests showed that the PPy/EB coating gave best protection in all media under investigation, the protection efficiency being in the range of 72 to 79% after 30 days of immersion. The result of OCP measurements showed significant positive shift in the corrosion potential for single as well as bi-layered coatings in all corrosive medium under investigation; the bi-layered coating showing more positive corrosion potential. The potentiodynamic polarization studies also confirmed lower corrosion rates for PPy/EB coating than the single polymer coatings.

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Long-term anticorrosion behaviour of polyaniline on mild Steel

Cited by 172 publications

References 22 publications

Electrochemical impedance spectroscopy investigation of chlorinated rubber‐based coatings containing polyaniline as anticorrosion agent

Electrochemical impedance spectroscopy investigation of chlorinated rubber‐based coatings containing polyaniline as anticorrosion agent

A new approach to using submicron emeraldine-base polyaniline in corrosion-resistant epoxy coatings

Corrosion Behavior of Chemically Deposited Single and Bi-layered Conducting Polymer Coatings on Mild Steel

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