Electrochemical behavior and anticorrosion properties of modified polyaniline dispersed in polyvinylacetate coating on carbon steel
2008 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 53, no 12, 4239-4247 p.Article in journal (Refereed) Published
Conducting polyaniline (Pani) was prepared in the presence of methane sulfonic acid (MeSA) as dopant by chemical oxidative polymerization. The Pani-MeSA polymer was characterized by FT-IR, UV-vis, X-ray diffraction (XRD) and impedance spectroscopy. The polyrner was dispersed in polyvinylacetate and coated oil carbon steel samples by a dipping method. The electrochemical behavior and anticorrosion properties of the coating, oil carbon steel in 3% NaCl were investigated using Open-circuit Potential (OCP) versus time of exposure, and electrochemical techniques including electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and cyclic voltammetry (CV). During initial exposure, the OCP dropped about 0.35 V and the interfacial resistance increased several times, indicating I certain reduction of the polymer and oxidation of the steel surface. Later the OCP shifted to the noble direction and remained at a stable value during the exposure up to 60 days. The EIS monitoring also revealed the initial change and later stabilization of the coating. The stable high OCP and low coating impedance Suggest that the conducting polymer maintains its oxidative state and provides corrosion protection for carbon steel through out the investigated period. The polarization curves and CV show that the conducting polymer coating induces a passive-like behavior and greatly reduces the corrosion of carbon steel.
Place, publisher, year, edition, pages
2008. Vol. 53, no 12, 4239-4247 p.
conducting polymer, redox property, corrosion protection, carbon steel, electrochemical impedance spectroscopy
Materials Chemistry Physical Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-17466DOI: 10.1016/j.electacta.2007.12.069ISI: 000255137500022ScopusID: 2-s2.0-40149091664OAI: oai:DiVA.org:kth-17466DiVA: diva2:335510
QC 20100525 QC 201203192010-08-052010-08-052012-03-19Bibliographically approved