The effect of TiO 2 as a pigment in a polyurethane/polysiloxane hybrid coating/aluminum interface based on damage evolution

•The pigment addition reinforces the paint by increasing the barrier properties.•The performance is influenced by the physical barrier of the coating, the TiO2 content is important for accumulating and distributing water more efficiently.•Of the systems tested, the system with 10wt% TiO2 provided the best corrosion inhibition.•The critical pigment volume concentration threshold is between 20wt% and 30wt%.