Silica Sol Coating Modified by Bifunctional Titanium Phosphate for Reinforce Bars
A silica sol coating for the surface of steel bars was prepared via mechanical blending and ultrasonic dispersion with water glass as the film precursor and α-Titanium hydrogen phosphate(α-TiP)as fillers,since the α-TiP is a cationic layered compound with excellent ion exchange performance.The structural morphology and ion exchange ability of α-TiP,as well as the structural morphology and corro-sion resistance of the coating were assessed by means of XRD,FT-IR,SEM,ion chromatography,and electrochemical measurement respectively.The results indicate that with ion exchange function the α-TiP can absorb free sodium ions within the water glass,and the prepared silica sol coating contains flakes ofα-TiP filler can effectively improve the barrier performance of the coating,thereby enhance the protective performance of the silica sol coating against steel corrosion,whilst the coating has the best protective per-formance when the addition amount of α-TiP is 0.4 g.
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