NOVELTY – Anticorrosive coating composition comprises a binding polymer, aluminum phosphate (1-25 wt.%) dispersed within the binding polymer, where: the aluminum phosphate consists of amorphous aluminum phosphate when the coating composition is applied to a metallic substrate; and the coating composition provides a controlled phosphate delivery of 50-500 ppm when applied to the metallic substrate and when contacted with water and oxygen. USE – The coating composition is useful for forming a primer coating, which is disposed on the metallic substrate; forming a mid-coat or top-coat of a coating system, where the midcoat or top-coat is in contact with the metallic substrate or the primer layer disposed on it (all claimed). ADVANTAGE – The composition: provides a desired degree of corrosion control/resistance without the use of materials that are hazardous to the environment and/or health or safety issues of people; and can be manufactured in a economical manner without the use of exotic equipment and more labor. DETAILED DESCRIPTION – INDEPENDENT CLAIMS are included for: (1) a system, for providing anticorrosion protection, comprising a coating composition applied to a metallic substrate and allowed to cure to form a film, where the cured coating composition comprises a binding polymer having an amorphous aluminum phosphate corrosion inhibiting pigment dispersed in it, the amorphous aluminum phosphate comprises amorphous aluminum hydroxyl phosphate, the coating composition comprises 1-25 wt.% of amorphous aluminum phosphate, and the coating composition has a controlled delivery of phosphate anion of less than 500 ppm; (2) preparing the coating composition, comprising preparing an amorphous aluminum phosphate corrosion inhibiting pigment by combining starting materials comprising an aluminum source with a phosphorus source and an alkaline solution and reacting the combined starting materials to form a solution comprising an amorphous aluminum phosphate precipitate, treating the amorphous aluminum phosphate precipitate to reduce total solubles to less than 1500 ppm, drying the precipitate at a temperature of less than 300 degrees C, where the dried precipitate comprises amorphous aluminum orthophosphate and mixing the amorphous aluminum orthophosphate with a binding polymer to form the coating composition; and (3) method-I of preparing an anticorrosion coating composition comprising preparing an amorphous aluminum orthophosphate corrosion inhibiting pigment by combining starting materials comprising sodium aluminate, phosphoric acid and sodium hydroxide to form a solution comprising an aluminum orthophosphate precipitate, treating the precipitate to reduce the level of total soluble to less than 1500 ppm, drying the precipitate at a temperature of less than 300 degrees C, where the dried precipitate comprises amorphous aluminum orthophosphate, sizing the dried amorphous aluminum orthophosphate to have a particle size of 0.01-25 microns and mixing the amorphous aluminum orthophosphate with a binding polymer to form the coating composition, which constitutes less than 25 wt.% of the total weight of the coating composition.
A82 (Coatings, impregnations, polishes – excluding textile finishing.); G02 (Inks, paints, polishes â€“ polymer-based paints and inks are also classified in Section A (C09D, F, G).); E33 (Compounds of Be, Mg, Ca, Sr, Ba, Ra, Sc, Y, La, Ac, Al, lanthanides (Rare-earths), Th.); M14 (Other chemical surface treatments – including etching, brightening, forming non-metallic layers, passivation, cathodic protection and corrosion inhibitors, but not processes specifically for semiconductor production (C23F, C25). This Section also covers multistage processes.); P73 (Layered products (B32).)