High performance anti-corrosive powder coatings based on phosphate pigments containing poly(o-aminophenol)

Great progress has been devoted recently in the applications of conducting polymers and their composites in corrosion protection of metals by coatings. The ultimate goal of this study is to formulate anti-corrosive hybrid epoxy/polyester and polyester powder coating composites based on phosphate pigments containing poly-o-aminophenol for corrosion protection of steel. The formulations were prepared in two steps. The first step involved In situ emulsion polymerization of o-aminophenol in presence of some phosphate pigments (mainly zinc phosphate, Ca phosphate and Ca-Zn phosphates) via chemical oxidation process using ammonium peroxydisulphate. The second step involved the formulation of the various ingredients of the powder coating composites using hybrid epoxy/polyester and polyester as binders with various doses of phosphate pigments and other inorganic pigments and fillers. The prepared powder coating composites were applied on a cold rolled steel panels and were investigated for physico-mechanical properties and evaluated for their corrosion protection properties via salt spray chamber for 1000 h. The obtained results showed high performance anti-corrosive powder coatings formulations for steel protection.