Characterisation and corrosion studies of steel electrodes covered by polypyrrole/phosphotungstate using Electrochemical Impedance Spectroscopy |
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| Authors: | J. Bonastre,P. Garcé s,J.C. Galvá n,F. Cases |
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| Affiliation: | 1. Departamento de Ingeniería Textil y Papelera, EPS de Alcoy, Universidad Politécnica de Valencia, Plaza Ferrándiz y Carbonell s/n, 03801 Alcoy, Spain;2. Departamento de Ingeniería de la Construcción, OP, Inf. Urbana, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain;3. Centro Nacional de Investigaciones Metalúrgicas, CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain |
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| Abstract: | Polypyrrole/PW12O403− hybrid material was electrosynthesised on carbon steel electrodes in acetonitrile medium. The coatings obtained were characterised by Electrochemical Impedance Spectroscopy (EIS). On free-standing polypyrrole films the electrical response was mainly due to ion–ion charge transfer resistance, with a value of 175 Ω cm2. A value of 2 × 10−5 S/cm was determined for the hybrid material conductivity. A charge transfer resistance about 7000 Ω cm2 was obtained due to steel/oxide interface. Corrosion tests showed an important improvement in the protection against corrosion when the carbon steel electrodes were coated by these polymeric films. |
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| Keywords: | Polypyrrole Phosphotungstate Carbon steel Polymer coating Electrochemical Impedance Spectroscopy |
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