Anticorrosion coating composition in aqueous dispersion comprising an organic titanate and/or zirconate

摘要

Anticorrosion coating compositions for metallic parts based on particulate metal in aqueous dispersion are described. The compositions include an organic titanate or zirconate compatible in aqueous phase or in organic phase, an optional silane-based binder, and water. Also described are methods of forming anticorrosion coatings for metallic parts obtained from the noted coating compositions as well as a metallic substrate provided with the anticorrosion coating. The anticorrosion coatings exhibit excellent corrosion resistance upon baking at temperatures greater than 180° C. and up to 350° C.

主权项

1. An anticorrosion coating for metallic substrate, the coating resulting from baking a coating composition at a temperature between greater than 180° C. and up to 350° C., the coating composition including from 0.3% to 24% by weight of at least one of an organic titanate and/or an organic zirconate, from 10% to 40% by weight of a particulate metal or a mixture of particulate metals, at least 1% by weight of a silane-based binder, and water, wherein the sum of the organic titanate and/or zirconate and of the silane-based binder is from 5 to 25% by weight, wherein upon baking, the coated metallic substrate exhibits resistance to corrosion from exposure to saline mist for at least 200 hours without formation of red rust and wherein the anticorrosion coating has a thickness of the dry film between 3 μm (11 g/m2) and 30 μm (110 g/m2).