Anticorrosion properties of inorganic pigments surface-modified with a polyaniline phosphate layer

Abstract

The paper deals with research into the effects of treating the surface of pigment particles with polyaniline layers in anticorrosion paints. The pigments involved were tested in a form coated with a polyaniline layer and in an uncoated form. To study anticorrosion properties, mixed metal oxides with the structure of spinel and perovskite were synthesized to be later coated with polyaniline. Polyaniline was also used to coat the pigments based on iron trioxide, silicates and graphite. Water-borne, epoxy resin-based paints containing the pigments with and without the surface layer of polyaniline were formulated. The coatings were tested by means of laboratory corrosion tests. These involved corrosion tests accelerated with an increased temperature, with high atmospheric humidity, and with the presence of corroding substances such as SO 2 and NaCl.