Crack-free Sol-Gel Coatings for Corrosion Protection of Carbon steel in concrete pore solution: An electrochemical corrosion investigation

Abstract

In this work, an appropriate protective coating for rebar has been discovered to increase the durability of such buildings when exposed to harsh environments. Electrochemical measurements were used to study the corrosion behavior of crack-free sol-gel coating carbon steel rebar in concrete pore solution containing chloride ions. Polyvinyl butyral (PVB)/silica (PVB/silica) nanocomposites were synthesized as hybrid sol-gel coatings on carbon steel rebar. Electrochemical impedance spectroscopy and polarization measurements were used to assess the corrosion resistance of coatings. The mechanical result indicates that Young’s modulus improved from 36.3 for pure PVB to 94.5 MPa for the PVB containing 15wt% silica. The electrochemical results indicate that an optimal PVB containing 10wt% silica-coated on steel rebar was required for the best performance of corrosion resistance. After two days of exposure, the coated PVB/10silica in CPS showed an inhibitory efficiency of 89.3%, which is highly good when compared to several recent publications.