Polypyrrole-polyures composite coating for corrosion protection

In this study, diurea was synthesized with condensation reaction of oleilamine with methylenediisocyanate. Also, some additives like colouring pigment was used for obtaining optimum film quality. Besides, diurea-polypyrrole composite coating was prepared on steel. In order to investigate corrosion performance of these coating, electrochemical testing was carried out in diluted Harrison solution (%0,35 (NH4)2SO4 + %0,05 NaCl), which represents the corrosive environment caused by acid rain. Electrochemical İmpedance Spectroscopy (EIS) and anodic polarization plots were used to evaluate corrosion performance. In order to investigate the resistance of both diurea and composite coatings Differential Scanning Calorimetric (DSC) measurement was carried out. Also, some NMR and ATR-FTIR studies were realized for structure analysis. The surface morphology of the coatings was examined by Scanning Electron Microscopy (SEM). The results showed that these coatings have shown good barrier property against corrosion of mild steel. Also temperature cycling testing was applied to compare the coating performance, under changing temperatures