Polypyrrole films modified with graphite layer on mild steel |
| |
Authors: | T Tüken G Tansu?B Yaz?c? M Erbil |
| |
Affiliation: | The University of Çukurova, Science and Arts Faculty, Chemistry Department, 01330 Adana, Turkey |
| |
Abstract: | Electrochemically synthesized polypyrrole coating was modified with very thin graphite layer and top coated with another polypyrrole film. The corrosion behaviour of this coating has been investigated in aqueous sodium chloride solution. The synthesis of polypyrrole coatings was carried out by cyclic voltammetry technique, from aqueous oxalic acid solution. Electrochemical impedance spectroscopy and potentiodynamic measurements were used for corrosion tests. The cyclic voltammograms obtained in oxalic acid solution and the polarisation curves obtained in sodium chloride solution showed that the stability of coating was improved significantly by graphite layer. The impedance spectra also showed that the corrosion process was controlled by the diffusion rate along the coating, even after 96 h immersion period. The Warburg coefficient values were calculated and used to evaluate the barrier property of coating with time. It was shown that the water up taking process was slowed down by the hydrophobic nature of the graphite layer sandwiched between the two polypyrrole films. |
| |
Keywords: | Polypyrrole Graphite Corrosion ac impedance |
本文献已被 ScienceDirect 等数据库收录! |