Organic coatings have long been employed to protect the steel surface against versatile corrosion environments by introducing a barrier to ionic transport and electrical conduction. Recently, we have prepared a novel silane-functional polybenzoxazine (PB-TMOS) coating with silane groups that can bond to the substrate, and the corrosion resistant performance of PB-TMOS coated specimens is considerably enhanced by its high hydrophobicity and water resistance resulted from the dual cross-linking network of polybenzoxazine and Si-O-Si in PB-TMOS matrix. In order to improve the corrosion protection of PB-TMOS coating, the organic�inorganic technique has been applied by incoporating SiO2 nanoparticles into the coating in present work. The results of FTIR and 29Si NMR suggest that silane groups of PB-TMOS can react with hydroxyl groups on the surface of SiO2 nanoparticles through covalent bond, which can enhance the adhesion of SiO2 nanoparticles in PB-TMOS matrix. Open circuit potentials-time plots, potentiodynamic polarisation curves and electrochemical impedance spectroscopy have been carried to quantify the corrosion resistance of PB-TMOS samples with and without SiO2 nanoparticles. It is evidence that the corrosion potential, Ecorr, shifts to the noble direction after coated with different PB-TMOS/SiO2 composite coatings on bare MS and the corrosion rate of PB-TMOS with 5% SiO2 nanoparticles coated samples are 17 times slower in 3.5wt% NaCl solution as compared to neat PB-TMOS coated sample. Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/239nm/uploads/7466_figure1_pdf_...jpg' alt='' />

Inhibition of mild steel corrosion by polybenzoxazine/silica composite coatings

246th National Meeting (2013)

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