Abstract
Red lead and zinc chromates are doubtless efficient pigments to protect painted metals against corrosion. Their use in paint formulation is being restricted due to environmental concerns. Inorganic phosphates, especially zinc phosphate, have been suggested to replace those pigments. As data presented in the literature are not conclusive, anticorrosive paints formulated with micronized zinc phosphate and vinyl binders have been studied. The principal variables considered were the pigment volume concentration/critical pigment volume concentration (PVC/CPVC) relationship and the content of anticorrosive pigments. Accelerated tests (salt spray and humidity chambers) as well as film adhesion and electrochemical measurements were performed to evaluate the paints anticorrosive performance. Results were compared with a reference paint containing zinc chromate. It was established that paints formulated with an acid resin, containing 30% zinc phosphate by volume and a PVC/CPVC ratio of 0.8–0.9 showed good anticorrosive behaviour.
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