CHROMATE-FREE CERAMIC COATING COMPOSITIONS Russian patent published in 2018 - IPC C04B41/50 B05D1/00 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to compositions and methods for producing coatings. Aqueous slurries composition for the production of a coating on a substrate comprises binder comprising an aqueous solution of lithium doped potassium silicate and characterized by an absence of chromium, and an aluminum or aluminum alloy powder incorporated into the binder, wherein the aluminum or the aluminum alloy powder and the binder are contained as a one-part composition. Slurry contains aluminum or aluminum alloy powder between about 35–45 weight percent (wt%) based on the total weight of the slurry, and the silicate to aluminum is contained in a ratio of about 0.22:1 to 0.37:1 by weight. Aluminum or aluminum alloy powder comprises a particle size distribution characterized in that the 50th percentile of the particle size distribution has a diameter of between about 4 to 7 microns, and the 90th percentile of the particle size distribution has a diameter of less than or equal to about 11.5–15.5 microns.

EFFECT: improved performance, including corrosion resistance and heat resistance, with reduced coating thickness.

11 cl, 49 dwg, 3 tbl, 4 ex