Abstract
Abstract The effect of pigment concentration ( C p ) on the corrosion resistance properties of zinc phosphate paints based on epoxy and chlorinated rubber has been investigated by using accelerated corrosion tests (salt spray, cyclic climatic change) of painted carbon steel samples combined with electrochemical impedance spectroscopy. Results show that all the paints act as a protective layer, and the corrosion behaviour of the painted steel samples was found to be dependent on C p . The physicochemical properties of a zinc phosphate coating are affected by the pigment concentration and the nature of the resin. There is a critical value of C p above which many such properties change abruptly. Characterization of the corrosion products was performed by scanning electron microscopy coupled to energy-dispersive X-ray spectroscopy. This analysis showed the presence of a mixture of iron and zinc oxide, which results from attack of the metallic support and reaction of the pigment.
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