2011
DOI: 10.4152/pea.201103139
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Corrosion Behavior of Chemically Deposited Single and Bi-layered Conducting Polymer Coatings on Mild Steel

Abstract: 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… Show more

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Cited by 12 publications
(3 citation statements)
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“…The initial OCP began to increase which leads to the initiation of corrosion process under the coating due to water up taking process by the coatings as a result of the anodic dissolution of carbon steel. With the increase of the exposure period, the more electrolytes is maintained in the coating, which increases the mobility of corrosive species in the coating and, accordingly, which further increases the anodic dissolution of the metal and decrease the effectiveness of the barrier coating [39]. Initiation and progression of corrosion phenomenon under the coating depends upon the thickness and porosity of the coating [39].…”
Section: Evolution Of the Open Circuit Potentialmentioning
confidence: 98%
“…The initial OCP began to increase which leads to the initiation of corrosion process under the coating due to water up taking process by the coatings as a result of the anodic dissolution of carbon steel. With the increase of the exposure period, the more electrolytes is maintained in the coating, which increases the mobility of corrosive species in the coating and, accordingly, which further increases the anodic dissolution of the metal and decrease the effectiveness of the barrier coating [39]. Initiation and progression of corrosion phenomenon under the coating depends upon the thickness and porosity of the coating [39].…”
Section: Evolution Of the Open Circuit Potentialmentioning
confidence: 98%
“…The analysis was performed spectrophotometrically [32][33] using Elico-SL-169 UV-visible spectrophotometer. The corrosion rate was calculated using the following relationship (Equation 3):…”
Section: Solution Analysis Of Metal Ionsmentioning
confidence: 99%
“…SOdecaimento de E ca brusco durante 1000 s. Entre os tempos de 1000 e 4000 s a amostra M/PAni-H 2 SO 4 apresenta-se mais nobre em relação a M/POMA-H 2 SO 4 e M/PAni-POMA-H 2 SO 4 e o potencial continua a decair de uma forma ligeira até se estabilizar a 5000 s (-0,261 V) a um mobilidade de agentes corrosivos através do filme aumenta[92,93]. Durante esse período a eficiência do efeito barreira conferida pelos revestimentos poliméricos vai diminuindo e quando o eletrólito atinge a superfície do metal, provoca a sua dissolução, o que justifica a queda de…”
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