Inhibition of corrosion of mild steel by homopolymer and bilayer coatings of polyaniline and polypyrrole

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• 作者：Aziz Yağ ; an ; Nuran Ö ; zç ; iç ; ek Pekmez ; Attila Y&#x131 ; ld&#x131 ; z
• 关键词：Electropolymerization ; Polyaniline ; Polypyrrole ; Bilayer ; Mild steel ; Impedance
• 刊名：Progress in Organic Coatings
• 出版年：2007
• 期刊代码：70_03009440
• 类别：ce
• 出版时间：2 July 2007
• 卷：59
• 期：4
• 页码：297-303
• 文件大小：371 K

摘要

Homopolymers and bilayers of polyaniline (PAni) and polypyrrole (PPy) coatings have been electropolymerized on mild steel by potentiodynamic synthesis technique in aqueous oxalic acid solutions. Characterization of coatings was carried out by cyclic voltammetry. Corrosion behavior of the polymer coated mild steel electrodes was investigated using linear anodic potentiodynamic polarization, Tafel test and electrochemical impedance spectroscopy (EIS) techniques in various aqueous corrosive solutions. Corrosion test results clearly showed that PPy and PAni/PPy bilayer coatings served as a stable host matrix on mild steel against corrosion. However, bilayers of PAni and PPy did not exhibit good combined properties of each polymer, unlike expected. PPy exhibited the best corrosion resistance among all coatings.