# US 9,039,882 B2 · Metal material with a bismuth film attached and method for producing same, surface treatment liquid used in said method, and cationic electrodeposition coated metal material and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,882 B2 - Document ID: US9039882B2 - Status: Granted - Kind: B2 - Application number: 14/491,419 - Filed: 2014-09-19 - Published: 2015-01-15 - Granted: 2015-05-26 - Earliest claimed: 2008-05-29 - Assignees: Nihon Parkerizing Co., Ltd. - Applicants: Nihon Parkerizing Co., Ltd. - Inventors: Ryosuke Kawagoshi; Hitoshi Ishii - Web page: https://patentgrep.com/patent/US9039882B2 ## CPC - C23C 30/005: {on hard metal substrates} - C23C 18/1637: {metallic substrate} - C23C 18/54: Contact plating, i.e. electroless electrochemical plating - C23C 22/50: Treatment of iron or alloys based thereon - C23C 22/53: Treatment of zinc or alloys based thereon - C23C 22/56: Treatment of aluminium or alloys based thereon - C23C 22/83: Chemical after-treatment - C25D 13/20: Pretreatment - Y10T 428/12389: having variation in thickness - Y10T 428/12681: Ga-, In-, Tl- or Group VA metal-base component - Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.] - 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) - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A metal material is provided with a bismuth coating which enables the subsequent coating to be accomplished at a high throwing power, and has excellent corrosion resistance, coating adhesion and is able to be produced with reduced damage to the environment. The metal material has a surface and a bismuth-containing layer deposited on at least a part of the surface of the metal material, wherein the percentage of bismuth atoms in the number of atoms in the surface layer of the metal material with a bismuth coating is at least 10%. ## Claims ### Claim 1 A surface treating solution for use in a chemical conversion of a metal material surface conducted as a pretreatment of a coating, wherein the surface treating solution contains bismuth ions and a first ligand for the bismuth ions in an amount effective to form a bismuth chemical conversion film on the metal surface. ### Claim 2 (depends on 1) The surface treating solution according to claim 1, wherein said coating is by cationic electrodeposition. ### Claim 3 (depends on 1) The surface treating solution according to claim 1, further comprising a brightener. ### Claim 4 (depends on 3) The surface treating solution according to claim 3, wherein the brightener is an organic compound having at least one member selected from the group consisting of an aromatic ring, a sulfone group, a formyl group, a carboxy group and an amino group. ### Claim 5 (depends on 3) The surface treating solution according to claim 3, wherein the solution at the time of the surface treatment contains the brightener at a weight concentration of 10 to 10,000 ppm. ### Claim 6 (depends on 3) The surface treating solution according to claim 3, wherein the first ligand is at least one member selected from the group consisting of an minopolycarboxylic acid and a carboxylic acid, and the solution contains at least one ligand which has a stability for the bismuth ions higher than a stability for an ion of a metal constituting the metal material. ### Claim 7 (depends on 3) The surface treating solution according to claim 3, wherein the first ligand is at least one member selected from the group consisting of an aminopolycarboxylic acid and/e a carboxylic acid, and has a stability for the bismuth ions higher than a stability for an ion of a metal constituting the metal material, and the solution further comprises a second ligand which has a stability for the ion of the metal constituting the metal material higher than a stability for the bismuth ions. ### Claim 8 (depends on 3) The surface treating solution according to claim 3, wherein the solution at the time of the surface treatment contains the bismuth ions at a weight concentration of 5 to 1,000 ppm. ### Claim 9 (depends on 3) The surface treating solution according to claim 3, having a pH of at least 2 and less than 10.5. ### Claim 10 (depends on 1) The surface treating solution according to claim 1, wherein the first ligand is at least one member selected from the group consisting of an aminopolycarboxylic acid and a carboxylic acid, and the solution contains at least one ligand which has a stability for the bismuth ions higher than a stability for an ion of a metal constituting the metal material. ### Claim 11 (depends on 1) The surface treating solution according to claim 1, wherein, the first ligand is an aminopolycarboxylic acid and has a stability for the bismuth ions higher than a stability for an ion of a metal constituting the metal material; and the solution further comprises a second ligand which has a stability for the ion of a metal constituting the metal material higher than a stability for the bismuth ions. ### Claim 12 (depends on 1) The surface treating solution according to claim 1, wherein the solution at the time of the surface treatment contains the bismuth ions at a weight concentration of 5 to 1,000 ppm. ### Claim 13 (depends on 12) The surface treating solution according to claim 12, wherein the solution at the time of the surface treatment contains the first ligand at a weight concentration of 5 to 25,000 ppm. ### Claim 14 (depends on 1) The surface treating solution according to claim 1, having a pH of at least 2 and less than 10.5.