Nanosilicon dioxide/o-phenylenediamine hybrid composite as a modifier for steel paints

Different amounts of the hybrid composite nano SiO2/o-phenylenediamine were added to a typical paint being used for protecting steel against corrosion to increase its protection efficiency. The nano features of the composite were confirmed by different electron microscopic investigations. It was found that the protection efficiency of the paint increased significantly as well as its adhesion to the steel surface increased. These conclusions had been inferred from both potentiodynamic polarization and electrochemical impedance spectroscopy techniques. To confirm the previous concept salt spray test and adhesion force measurements were carried out. The results were interpreted in terms of the filling properties of nano SiO2 and adsorption/hardening power of o-phenylenediamine.

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► (SiO2 and o-phenylenediamine) nanocomposite as corrosion inhibitor for carbon steel.
► The inhibition efficiency increased with increased SiO2 nanoparticles percentage.
► Ecorr shifted slightly toward anodic direction that inhibited the anodic reaction.
► Rct increased and Cdl decreased with increased nanocomposite concentration.
► Salt spray results were confirmed the polarization and EIS results.