Abstract
A novel organic-inorganic hybrid chemical conversion film was prepared by phytic acid-triethoxyvinylsilane composite and zinc ions via solution immersion method. The phytic acid-triethoxyvinylsilane composite which contained abundant organic groups was synthesized by the condensation reaction between phytic acid and triethoxyvinylsilane. The results of electrochemical impedance spectroscopic and polarization curves indicate that the anti-corrosion performance of the hybrid films exhibited good anti-corrosion performance and the highest protection efficiency of the fabricated film was 99.79% when the film formation time is 45 min. The salt spraying test and adhesion test indicated that the fabricated hybrid films exhibited the best adhesion performance when the film formation time is 15 min. So the anti-corrosion and adhesion performance of the chemical conversion film may be not agreed. The scanning electron microscope results indicated that the roughness and cracks of the surface of the films may be the main reasons that affect the anti-corrosion and adhesion performances. X-ray photoelectron spectroscopy results demonstrated that phytic acid-triethoxyvinylsilane composite adsorbed on steel surface through the formation of Fe–O–P bonds and the Zn2+ participated the film formation process through the formation of zinc phosphate and ZnO.
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