The conducting PANI nano-particulate TiO2hybrid composites prepared by in situ polymerization were used for coating with PVB as the matrix. The effect of addition of nano-TiO2on the improvement of has been clearly brought out The novelty of these coatings lies in generation of corrosion inhibition by three mechanisms operating simultaneously viz. improvement of barrier properties, redox behaviour of PANI and formation of p–n junctions preventing easy charge transport when coating is threatened to be destroyed due to scratch or scribble. Even if the main resin is damaged, the additives give a healing effect and prevent catastrophic failure. Apart from the prevention of corrosion, these coatings have good gloss and shiny surface, which is not easily obtained in conventional coating, prepared with commercial micron size particle additives. Such systems can be used as a primer coat or even as a single coating on steel where colour is not a very important criterion.
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