Abstract
In this paper, waterborne epoxy (EP) coatings were modified by the incorporation of synthetic structure (DA/meso-TiO2) to improve the anticorrosion ability of waterborne epoxy coatings for steel structures. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption, X-ray diffraction (XRD) and thermo-gravimetric analyses (TGA) were used to characterize textural properties of DA/meso-TiO2. Corrosion performances of mild carbon steel coated samples were tested by salt spray tests and employing electrochemical impedance spectroscopy (EIS). FTIR, XRD, TGA and nitrogen adsorption–desorption attested to dopamine polymerization within the mesopores and on the surface of meso-TiO2. The results of EIS and salt spray test showed that the specimen coated with 1.0 wt % DA/meso-TiO2 exhibited optimum corrosion performance among other coating specimens.
Highlights
Waterborne epoxy resins have occupied a major place in the development of high performance light weight composites due to the unique combination of properties and are more environmentally friendly compared with epoxy resins [1,2,3,4]
We proved that waterborne epoxy resin has better anticorrosion properties due to the addition of MCM-41 and we proved that meso-TiO2 can increase the barrier performance of the coatings more availably due to the larger pore size of meso-TiO2 than
Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results showed that meso-TiO2 was obtained successfully
Summary
Waterborne epoxy resins have occupied a major place in the development of high performance light weight composites due to the unique combination of properties and are more environmentally friendly compared with epoxy resins [1,2,3,4]. Thedopamine dopaminewhich whichinlays inlaysonon the surface and inside of the meso-TiO strengthen possible chemical interactions between epoxy matrix and meso-TiO2 [17], so that the strengthen possible chemical interactions between epoxy matrix and meso-TiO [17], so that the can strengthen possible chemical interactions between epoxy matrix and meso-TiO2 [17], so that molecular chain of the epoxy resin in the nano-sized pores extending along the channels to the molecular chain of of thethe epoxy resin to the the the molecular chain epoxy resinininthe thenano-sized nano-sizedpores poresextending extending along along the the channels to openings, which enhance the miscibility through the entanglement and inter-diffusion between the openings, which which enhance enhance the themiscibility miscibility through through the theentanglement entanglement and and inter-diffusion inter-diffusion between between the the openings, matrix and the particulate It highly suppresses the aggregation of fillers (Figure 2) [18].
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