Method for the production of electroplated components

Patent metadata

Field	Value
Publication number	US-11021805-B2
Application number	US-201916677536-A
Country	US
Kind code	B2
Filing date	Nov 7, 2019
Priority date	Nov 9, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

Disclosed is a method for the production of electroplated components. In the disclosed method, an edge layer of a component to be coated is subjected to a mechanical treatment in which the edge layer is deformed at least in portions, consequently the structure of the edge layer being modified at least in portions and hydrogen traps being produced in the modified portions of the edge layer.

First claim

The invention claimed is:

1. A method for producing electroplated components, in which
a) an edge layer of a component to be coated is subjected to a mechanical treatment, in which the edge layer is deformed at least in portions, consequently the structure of the edge layer being modified at least in portions and, in the modified portions of the edge layer, hydrogen traps being produced, and
b) at least on a part of the surface of the mechanically treated edge layer of the component to be coated, a coating is electrodeposited, hydrogen being released during the electrodeposition which penetrates into the mechanically treated edge layer at least partially,
the hydrogen traps produced in the modified portions of the edge layer essentially binding the totality of the hydrogen penetrating into the mechanically treated edge layer during the electrodeposition in step b);
wherein it is determined or estimated before step a) what volume of hydrogen will penetrate into the mechanically treated edge layer during the electrodeposition in step b), and
the mechanical treatment in step a) is effected such that the total volume of the hydrogen traps produced in the modified portions of the edge layer is greater than or equal to the volume of hydrogen determined or estimated before step a).

2. The method according to claim 1 , wherein the mechanical treatment in step a) is effected by shot peening, by rolling, by hammering, by material-removing machining, or by a combination thereof.

3. The method according to claim 1 , wherein the component to be coated comprises a crystalline material.

4. The method according to claim 3 , wherein the crystalline material is selected from the group consisting of metals, semimetals, ceramics and mixtures thereof.

5. The method according to claim 1 , wherein the coating is a coating made of a metal or of a metal alloy, the metal and/or the metal alloy being selected from the group consisting of gold, silver, iron, chromium, nickel, copper, cadmium, palladium, zinc, and mixtures and alloys thereof.

6. The method according to claim 1 , wherein, during the mechanical treatment in step a), the structure of the edge layer is modified, at least in portions, to a depth of more than 0.01 mm, and hydrogen traps are produced in the modified portions of the edge layer.

7. The method according to claim 1 , wherein it is determined or estimated, before step a), to what depth the hydrogen will penetrate into the mechanically treated edge layer during the electrodeposition in step b), and the mechanical treatment in step a) is effected such that the hydrogen traps produced in the edge layer are produced at least in the portions, the surface of which is intended to be coated in step b), to this depth determined or estimated before step a).

8. The method according to claim 7 , wherein the determination of the depth is effected before step a) by the surface of the edge layer of a further component which consists of the same material as the component to be coated, being provided with an electroplating, at least in portions, which consists of the same material as the electroplating in step b) and, directly thereafter, by the depth course of the hydrogen content in the edge layer being analysed.

9. The method according to claim 1 , wherein, after step a) and before step b), a chemical pre-treatment of the surface of the component to be coated is implemented,
the chemical pre-treatment of the surface of the component to be coated being selected from the group consisting of de-greasing the surface, etching the surface, pickling the surface, activating the surface and a combination thereof.

10. A method for producing electroplated components, in which
a) an edge layer of a component to be coated is subjected to a mechanical treatment, in which the edge layer is deformed at least in portions, consequently the structure of the edge layer being modified at least in portions and, in the modified portions of the edge layer, hydrogen traps being produced, and
b) at least on a part of the surface of the mechanically treated edge layer of the component to be coated, a coating is electrodeposited, hydrogen being released during the electrodeposition which penetrates into the mechanically treated edge layer at least partially,
the hydrogen traps produced in the modified portions of the edge layer essentially binding the totality of the hydrogen penetrating into the mechanically treated edge layer during the electrodeposition in step b);
wherein it is determined or estimated, before step a), to what depth the hydrogen will penetrate into the mechanically treated edge layer during the electrodeposition in step b), and the mechanical treatment in step a) is effected such that the hydrogen traps produced in the edge layer are produced at least in the portions, the surface of which is intended to be coated in step b), to this depth determined or estimated before step a).

11. The method according to claim 10 , wherein the determination of the depth is effected before step a) by the surface of the edge layer of a further component which consists of the same material as the component to be coated, being provided with an electroplating, at least in portions, which consists of the same material as the electroplating in step b) and, directly thereafter, by the depth course of the hydrogen content in the edge layer being analysed.

12. The method according to claim 10 , wherein the mechanical treatment in step a) is effected by shot peening, by rolling, by hammering, by material-removing machining, or by a combination thereof.

13. The method according to claim 10 , wherein the component to be coated comprises a crystalline material.

14. The method according to claim 13 , wherein the crystalline material is selected from the group consisting of metals, semimetals, ceramics and mixtures thereof.

15. The method according to claim 10 , wherein the coating is a coating made of a metal or of a metal alloy, the metal and/or the metal alloy being selected from the group consisting of gold, silver, iron, chromium, nickel, copper, cadmium, palladium, zinc, and mixtures and alloys thereof.

Assignees

• Fraunhofer Ges Forschung

Inventors

• Pfeiffer Wulf

Classifications

• C25D5/36 Primary

  of iron or steel · CPC title

• C25D5/617

  Crystalline layers · CPC title

• C25D5/54

  Electroplating of non-metallic surfaces (C25D7/12 takes precedence) · CPC title

• C25D7/003

  Threaded pieces, e.g. bolts or nuts · CPC title

• C25D3/22

  of zinc · CPC title