# US 2019/0169752 A1 · Systems and Methods for Treating a Metal Substrate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169752 A1 - Document ID: US20190169752A1 - Status: Published application - Kind: A1 - Application number: 16/324,957 - Filed: 2017-08-14 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: PRC-DeSoto International, Inc. - Applicants: PRC-DeSoto International, Inc. - Inventors: Eric L. MORRIS - Web page: https://patentgrep.com/patent/US20190169752A1 ## CPC - C23C 22/78: Pretreatment of the material to be coated - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - C09D 5/34: Filling pastes (materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12) - C23C 22/56: Treatment of aluminium or alloys based thereon - C23C 22/66: Treatment of aluminium or alloys based thereon - C23C 22/83: Chemical after-treatment - C23C 30/00: Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) - C23G 1/02: with acid solutions - C23G 1/04: using inhibitors - C23G 1/061: {nitrogen-containing compounds} - C23G 1/14: with alkaline solutions - C23G 1/16: using inhibitors - C23G 1/18: Organic inhibitors - C23G 1/24: with neutral solutions - C23G 1/26: using inhibitors - C23C 2222/10: Use of solutions containing trivalent chromium but free of hexavalent chromium - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS ## Abstract Disclosed is a conversion composition containing a trivalent chromium cation in an amount of 0.001 g/L to 20 g/L. Also disclosed is a system for treating a metal substrate that includes the conversion composition and a sealing composition comprising a lithium cation. Also disclosed is a method for treating a metal substrate that includes contacting at least a portion of a surface of the substrate with the conversion composition and then contacting at least a portion of the surface of the substrate with the sealing composition. Also disclosed is a substrate obtainable by treatment with the system and/or obtainable by the method of treating. ## Claims ### Claim 1 A system for treating a metal substrate comprising: a conversion composition comprising a trivalent chromium cation in an amount of 0.001 g/L to 20 g/L; and a sealing composition comprising a lithium cation. ### Claim 2 (depends on 1) The system of claim 1, wherein the conversion composition further comprises an anion suitable for forming a salt with the trivalent chromium cation. ### Claim 3 (depends on 1) The system of claim 1, wherein the conversion composition further comprises at least one coinhibitor. ### Claim 4 (depends on 1) The system of claim 1, wherein the sealing composition has a pH of 9.5 to 12.5. ### Claim 5 (depends on 1) The system of claim 1, wherein the lithium cation is present in the sealing composition in an amount of 5 ppm to 5500 ppm (as metal cation) based on total weight of the sealing composition. ### Claim 6 (depends on 1) The system of claim 1, further comprising a carbonate, a hydroxide, or combinations thereof. ### Claim 7 (depends on 1) The system of claim 1, wherein the sealing composition further comprises an azole, an indicator compound, or combinations thereof. ### Claim 8 (depends on 1) The system of claim 1, further comprising a cleaning composition. ### Claim 9 (depends on 8) The system of claim 8, wherein the cleaning composition comprises a hydroxide source and/or a phosphate source. ### Claim 10 (depends on 8) The system of claim 8, wherein the cleaning composition has a pH of 7 to 13. ### Claim 11 (depends on 8) The system of claim 8, wherein the cleaning composition has a pH of 0.5 to 6. ### Claim 12 (depends on 8) The system of claim 8, wherein the cleaning composition further comprises a corrosion inhibitor comprising a metal cation and/or an azole. ### Claim 13 (depends on 8) The system of claim 8, wherein the cleaning composition comprises a deoxidizer. ### Claim 14 (depends on 1) The system of claim 1, wherein the system further comprises a chemical deoxidizer. ### Claim 15 (depends on 1) A substrate obtainable with the system of claim 1. ### Claim 16 A method of treating a substrate comprising: contacting at least a portion the substrate surface with a conversion composition comprising a trivalent chromium cation in an amount of 0.001 g/L to 20 g/L; and contacting at least a portion of the substrate surface with a sealing composition comprising a lithium cation. ### Claim 17 (depends on 16) The method of claim 16, wherein the sealing composition has a pH of 9.5 to 12.5. ### Claim 18 (depends on 16) The method of claim 16, further comprising contacting at least a portion of a surface of the substrate with a cleaning composition; wherein the contacting with the cleaning composition occurs prior to the contacting with the conversion composition. ### Claim 19 (depends on 16) A substrate obtainable by the method of claim 16. ### Claim 20 (depends on 19) The substrate of claim 19, wherein the substrate contacted with the sealing composition has at least a 40% reduction in the number of pits on the substrate surface compared to a substrate not treated with the sealing composition following 7 day exposure in neutral salt spray cabinet operated according to ASTM B117.