MUMBAI, India, Sept. 5 -- Intellectual Property India has published a patent application (202347051331 A) filed by Henkel Ag & Co. Kgaa, Dusseldorf, Germany, on July 31, 2023, for 'improved cr (iii)-based passivation for zinc-aluminium coated steel.'
Inventor(s) include Jadhav, Aditi; Vijay, Meenu; Das, Niranjan; and Wagh, Komal.
The application for the patent was published on Sept. 5, under issue no. 36/2025.
According to the abstract released by the Intellectual Property India: "The present application is directed to an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, said composition having a pH of from 6.5 to 9 and comprising, based on the weight of the composition: from 5 to 60 wt.% of a) at least one base polymer selected from acrylic polymers and non-ionic polyurethane polymers; from 0.1 to 2.5 wt.% of b) trivalent Cr(III) ions, calculated as Cr; c) ascorbic acid; from 0.1 to 2.5 wt.% of d) at least one aluminium compound selected from the group consisting of: aluminium hydroxide; aluminium metahydroxide; aluminium trichloride; aluminium alcoholates; aluminium glycolates; aluminium tris(-ketones); aluminum tris(-ketoesters); aluminium soaps; and, aluminium carboxylates; and, up to 10 wt.% of e) at least one finely divided wax, wherein said composition is characterized in that it is substantially free of nitrate anions and is substantially free of hexavalent chromium (Cr(VI))."
The patent application was internationally filed on Jan. 06, 2021, under International application No.PCT/EP2021/050133.
Disclaimer: Curated by HT Syndication.
