The invention relates to methods and plating baths for electrodepositing a dark chromium layer on a workpiece. The trivalent chromium electroplating baths comprise sulphur compounds and the methods for electrodepositing a dark chromium layer employ these trivalent chromium electroplating baths. The dark chromium deposits and workpieces carrying dark chromium deposits are suited for application for decorative purposes.

Electroplating bath and method for producing dark chromium layers

The present invention relates to a method for manufacturing a chromium metal - chromium oxide coated substrate by electrolytically depositing the chromium metal - chromium oxide coating on an electrically conductive substrate from an electrolyte solution that comprises a trivalent chromium compound and a chelating agent, wherein the electrolyte solution is free of chloride ions and of a boric acid buffering agent, the electrically conductive substrate acts as a cathode and an anode comprising a catalytic coating of iridium oxide or a mixed metal oxide is chosen for reducing or eliminating the oxidation of Cr(III)-ions to Cr(VI)-ions.

Method for manufacturing chromium-chromium oxide coated substrates

Disclosed is a trivalent chromium plating bath which is characterized by being composed of an aqueous solution containing a water-soluble trivalent chromium compound, a conductive salt and a pH buffering agent. The trivalent chromium plating bath is also characterized in that the aqueous solution has a trivalent chromium ion concentration of 0.003-0.12 mol/L. Also disclosed are a chromium plating method comprising a step of forming a chromium plating film on an object to be plated by using the object as a cathode in the trivalent chromium plating bath and then washing the plated object with a washing water containing a complexing agent for trivalent chromium ions, and an article having a chromium plating film formed by using the trivalent chromium plating bath. The chromium plating bath of the present invention is a commercially effective novel trivalent chromium plating bath which has solved various problems of conventional trivalent chromium plating baths.

Trivalent chromium plating bath

The invention discloses a copper plating method on a brass base material, comprising the following processes in order: (1) oil removing process which successively contains degreasing and oil-removing process, a first electrolytic degreasing process and a second electrolytic degreasing process; (2) pickling process which successively contains activation and pickling processes; (3) nickel preplating process; (4) nickel plating process; (5) copper plating process; (6) passivation process; and (7) coating processing. The technology provided by the invention is simple. By the adoption of the technology, mass production cost is reduced. The processed product copper coating is compact and tight, is wear resistant and impact resistant, and has good conductivity and ductility. In addition, as the brass base material is used to replace a titanium copper material, the cost and weight of the material are greatly reduced, and shelf-life of the product is long.

Copper plating method on brass base material

A method of treating a substrate, wherein the substrate comprises a layer deposited from a trivalent chromium electrolyte, is described. The method includes the steps of providing an anode and the chromium (III) plated substrate as a cathode in an electrolyte comprising (i) a trivalent chromium salt; and (ii) a complexant; and passing an electrical current between the anode and the cathode to passivate the chromium (III) plated substrate. The substrate may be first plated with a plated nickel layer so that the chromium (III) plated layer is deposited over the nickel plated layer.

Passivation of micro-discontinuous chromium deposited from a trivalent electrolyte

PROBLEM TO BE SOLVED: To provide a solution for use in treating a trivalent-chromium plated film, which can greatly improve a corrosion resistance of the trivalent-chromium plated film without using a hexavalent chromium compound, and to provide a treatment method therefor. SOLUTION: The solution for use in electrolytically treating the trivalent-chromium plated film is formed of an aqueous solution containing a water-soluble trivalent chromium compound. The method for electrolytically treating the trivalent-chromium plated film includes cathodically electrolyzing an article which has the trivalent-chromium plated film thereon, in the electrolytic treatment solution. COPYRIGHT: (C)2010,JPO&INPIT

Solution for use in electrolytically treating trivalent-chromium plated film

PROBLEM TO BE SOLVED: To provide a rust-preventing treatment liquid which can greatly improve corrosion resistance not only of a plated chromium film obtained from a trivalent chromium bath but also of a plated chromium film obtained from a hexavalent chromium bath, gives little harmful effect on the environment, and does not contain a hexavalent chromium compound, and to provide a rust-preventing treatment method. SOLUTION: The immersion treatment liquid for the rust prevention of the plated chromium film is formed of an aqueous solution containing chromium phosphate. The method for rust-preventing treatment of the plated chromium film includes immersing an article having the plated chromium film thereon into the treatment liquid and further electrolyzing the article in an aqueous solution containing a water-soluble trivalent chromium compound as necessary. COPYRIGHT: (C)2010,JPO&INPIT

Immersion treatment liquid for rust prevention of plated chromium film, and rust-preventing treatment method

PROBLEM TO BE SOLVED: To provide a trivalent chromium plating bath by which a plated film having a smooth surface, high corrosion resistance and satisfactory wear resistance is obtained with high productivity SOLUTION: The trivalent chromium plating bath contains following components (1)-(4), that are, (1) a trivalent chromium complex solution obtained by holding at least one kind of component selected from aqueous aliphatic carboxylic acids and the salts and an aqueous solution containing a trivalent chromium compound under heating , (2) a conductive salt, (3) a pH buffer agent and (4) at least one sulfur-containing compound selected from a group comprising compounds having SO 2 group and compounds having SO 3 group COPYRIGHT: (C)2009,JPO&INPIT

Trivalent chromium plating bath and method of preparing the same

PROBLEM TO BE SOLVED: To provide a plating film structure having superior appearance, corrosion resistance and wear resistance, and to provide a treatment process which can be industrially used. SOLUTION: The method of manufacturing plated molded article in which plating treatment is performed to the surface of a molded article includes: a process (a) of forming a copper plating film on the surface of the molded article according to a brilliance copper sulfate plating; a process (b) of forming a first chromium plating film by performing trivalent chromium plating onto the surface of the copper plating film; and a process (c) of forming a second chromium plating film by performing hexavalent chromium plating onto the surface of the first chromium plating film. COPYRIGHT: (C)2010,JPO&INPIT

Method of manufacturing plated molded article using no nickel, and plated molded article

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