Abstract

The invention relates to an electrolytic bath for electrodeposition containing nickel salt, phosphoric acid, phosphonic acid, and boric acid in solution. The invention further relates to a method for producing an electrolytic bath comprising the following steps: a nickel salt, phosphoric acid, phosphonic acid, and boric acid are mixed; and nickel carbonate is added in order to increase the pH value.

IPC Classes  ?

• C25D 3/56 - ElectroplatingBaths therefor from solutions of alloys

Abstract

A layer arrangement (17) for an intaglio cylinder (10) comprises nickel in at least a first region (30) through the entire thickness (d) thereof, with a mass fraction of at least 0.80. Said arrangement is designed to permit an imaging (23) by means of a laser in said region (30) and to serve as the outermost layer of the intaglio cylinder (10) for intaglio printing. A method for producing a layer arrangement for a printing form (10), said layer arrangement (17) comprising nickel in at least a first region (30) through the entire thickness (d) thereof, with a mass fraction of at least 0.80 and at least in the radially external region (16) has a solid lubricant component (X) has the following steps: the layer arrangement (17) is produced on a cylinder core (12) by galvanic coating and a printing image (23) is generated on the layer arrangement (17) for intaglio printing.

IPC Classes  ?

• C25D 5/14 - Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
• C25D 15/00 - Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
• B41C 1/05 - Heat-generating engraving heads, e.g. laser beam, electron beam
• B41N 1/20 - Curved printing plates, especially cylinders made of metal
• F16J 10/04 - Running facesLiners

Abstract

A workpiece (10), in particular an intaglio printing cylinder, comprises a base body (12), a first layer (14), at least partly arranged om the base body (12) containing nickel with a mass fraction of at least 0.80, in particular of at least 0.95, and a second layer (16), arranged at least partly on the side of the base body (12) opposite the first layer (14), containing nickel with a mass fraction of 0.70, in particular at least 0.85 and also contains at least one non-metallic component, wherein the second layer (16) is harder than the first layer (14).

IPC Classes  ?

• C25D 5/14 - Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
• C25D 15/00 - Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
• B41C 1/05 - Heat-generating engraving heads, e.g. laser beam, electron beam
• B41N 1/20 - Curved printing plates, especially cylinders made of metal
• F16J 10/04 - Running facesLiners
• C25D 5/48 - After-treatment of electroplated surfaces

Abstract

The invention relates to a method for the copper electroplating of a workpiece (50), in particular an impression cylinder (50), according to which copper carbonate (74, 79) is fed to a sulphuric-acid copper plating bath (30, 32, 34) for supplying copper. An electrolytic bath (30, 32, 34) contains a solution of copper and sulphuric acid and copper carbonate is added to said bath. The invention also relates to the use of copper carbonate (74, 79) for supplying copper in a sulphuric-acid copper plating bath during a copper electroplating method. The invention also discloses an electroplating device (10) for carrying out a method of this type.

IPC Classes  ?

• C25D 3/38 - ElectroplatingBaths therefor from solutions of copper
• C25D 17/00 - Constructional parts, or assemblies thereof, of cells for electrolytic coating
• C25D 21/14 - Controlled addition of electrolyte components