# US 5,700,334 A · Composition and process for imparting a bright blue color to zinc/aluminum alloy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,334 A - Document ID: US5700334A - Status: Granted - Kind: A - Application number: 08/535,253 - Filed: 1995-11-28 - Granted: 1997-12-23 - Earliest claimed: 1993-04-28 - Assignees: Henkel Corporation - Inventors: Hitoshi Ishii; Takao Ogino - Web page: https://patentgrep.com/patent/US5700334A ## CPC - C23C 22/44: containing also fluorides or complex fluorides - 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) ## Abstract The rapid, low-temperature formation of a bright blue surface on hot-dip zinc/aluminum alloy-plated steel sheet that contains 0.1 to 60 weight % aluminum in the alloy, or on other surfaces of similar chemical composition, using conventional surface-treatment equipment, is achieved by treating the surface with a treatment bath that has a pH of 3.5 to 6.0 and that contains molybdenum compound at 0.2 to 3.0 weight % as molybdenum and simple or complex fluoride at 0.1 to 2.0 weight % as fluorine. ## Claims ### Claim 1 A process for imparting a bright blue color to a zinc/aluminum alloy surface that contains 0.1 to 60 weight % aluminum by treatment of the surface with an aqueous liquid treatment composition that has a pH of 3.5 to 6, that does not contain chromium, and that contains a molybdenum compound content of 0.2 to 3.0 weight % calculated as molybdenum and a fluoride content of 0.1 to 2.0 weight % calculated as fluorine. ### Claim 2 (depends on 1) A process according to claim 1, wherein the pH of the aqueous treatment composition is from 3.8 to 4.5. ### Claim 3 (depends on 2) A process according to claim 2, wherein the molybdenum content of the aqueous treatment composition is from 0.5 to 2.0 weight %. ### Claim 4 (depends on 1) A process according to claim 1, wherein the molybdenum content of the aqueous treatment composition is from 0.5 to 2.0 weight %. ### Claim 5 (depends on 4) A process according to claim 4, wherein the fluoride content of the aqueous treatment composition is from 0.3 to 1.0 weight %. ### Claim 6 (depends on 3) A process according to claim 3, wherein the fluoride content of the aqueous treatment composition is from 0.3 to 1.0 weight %. ### Claim 7 (depends on 2) A process according to claim 2, wherein the fluoride content of the aqueous treatment composition is from 0.3 to 1.0 weight %. ### Claim 8 (depends on 1) A process according to claim 1, wherein the fluoride content of the aqueous treatment composition is from 0.3 to 1.0 weight %. ### Claim 9 (depends on 8) A process according to claim 8, wherein the time of treatment is from 1 to 10 seconds and the temperature of the treatment composition during treatment is from 30.degree. to 70.degree. C. ### Claim 10 (depends on 7) A process according to claim 7, wherein the time of treatment is from 2 to 5 seconds and the temperature of the treatment composition during treatment is from 45.degree. to 60.degree. C. ### Claim 11 (depends on 6) A process according to claim 6, wherein the time of treatment is from 2 to 5 seconds and the temperature of the treatment composition during treatment is from 45.degree. to 60.degree. C. ### Claim 12 (depends on 5) A process according to claim 5, wherein the time of treatment is from 2 to 5 seconds and the temperature of the treatment composition during treatment is from 45.degree. to 60.degree. C. ### Claim 13 (depends on 4) A process according to claim 4, wherein the time of treatment is from 1 to 10 seconds and the temperature of the treatment composition during treatment is from 30.degree. to 70.degree. C. ### Claim 14 (depends on 3) A process according to claim 3, wherein the time of treatment is from 2 to 5 seconds and the temperature of the treatment composition during treatment is from 45.degree. to 60.degree. C. ### Claim 15 (depends on 2) A process according to claim 2, wherein the time of treatment is from 1 to 10 seconds and the temperature of the treatment composition during treatment is from 30.degree. to 70.degree. C. ### Claim 16 (depends on 1) A process according to claim 1, wherein the time of treatment is from 1 to 10 seconds and the temperature of the treatment composition during treatment is from 30.degree. to 70.degree. C. ### Claim 17 (depends on 1) A process according to claim 1, wherein the surface treated is that of hot-dip zinc-aluminum alloy-plated steel sheet.