Effect of nano-TiO2 particles size on the corrosion resistance of alkyd coating

• Nano-TiO2 coating were prepared and used for corrosion protection of C-steel.
• Nano-TiO2 particles in coating are effective to improve the corrosion resistance.
• Nano-TiO2 coating inhibit both anodic and cathodic reactions.
• Corrosion inhibition efficiency increases with decrease in the size of nano-TiO2.
• O2 and H2O permeability of coating decreased with decrease in the nano-TiO2 size.

The coating system containing various sizes (∼10, 50, 100, 150 nm) of nano-TiO2 were prepared and investigated for corrosion protection of carbon steel in 1.0 M H2SO4 using polarization, EIS and transmission electron microscopy (TEM) techniques. It was found that nano-TiO2 particles improved the corrosion resistance of alkyd coatings. The corrosion resistance occurs via physical adhesion on the metal surface. O2 and H2O permeability of coating decreased with decrease in the nano-TiO2 size. The inhibition efficiency was found to increase with decreasing the size of nano-TiO2 and with decreasing the temperature.

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