Abstract
In this work we present the development of two organic–inorganic hybrid coatings with interpenetrating network for corrosion protection of tinplated steel. The hybrid coatings were obtained from the hydrolytic condensation of tetraethoxysilane and 3-methacryloxypropyltrimethoxysilane, which has a free-radical polymerizable C˭C double bond. The tri-functional monomers, triallyl isocyanurate and trimethylolpropane triacrylate (TMPTMA) with three C˭C double bonds, were used to develop a highly cross-linked organic network attached to the inorganic moieties through covalent Si–C bonds, respectively. Both were characterized by Fourier transformed infrared spectroscopy and thermogravimetric analysis. The corrosion resistance performance was evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy, and salt spray test. The results indicated that the Sol-TMPTMA hybrid coating exhibited excellent anti-corrosion ability by forming a physical barrier between tinplated steel substrate and its external environment.
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