Composite plated product and method for producing same

Patent metadata

Field	Value
Publication number	US-11225726-B2
Application number	US-202016749140-A
Country	US
Kind code	B2
Filing date	Jan 22, 2020
Priority date	Jan 22, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

There are provided a composite plated product, which has little uneven appearance, a low contact resistance and good wear resistance, and a method for producing the same without the need of any silver-plating solutions containing cyanides and any silver-plating solutions containing silver nitrate as a silver salt. After carbon particles are caused to be suspended in water, an oxidizing agent is added thereto for carrying out a wet oxidation treatment of the carbon particles, and a silver-plating solution, which contains at least one sulfonic acid and the carbon particles treated by the wet oxidation treatment, is used for electroplating a base material to form a coating film of a composite material, which contains the carbon particles in a silver layer, on the base material to produce a composite plated product.

First claim

What is claimed is:

1. A method for producing a composite plated product, the method comprising the steps of:
treating carbon particles by an oxidation treatment;
adding the treated carbon particles to a silver-plating solution containing a sulfonic acid; and
forming a coating film of a composite material, which contains the treated carbon particles in a silver layer, on a base material by electroplating the base material using the silver-plating solution containing the sulfonic acid and the treated carbon particles.

2. A method for producing a composite plated product asset forth in claim 1 , wherein said oxidation treatment is a wet oxidation treatment.

3. A method for producing a composite plated product as set forth in claim 2 , wherein said wet oxidation treatment is a treatment for causing said carbon particles to be suspended in water, and thereafter, adding an oxidizing agent thereto.

4. A method for producing a composite plated product as set forth in claim 3 , wherein said oxidizing agent is selected from the group consisting of nitric acid, hydrogen peroxide, potassium permanganate, potassium persulfate, sodium persulfate and sodium perchlorate.

5. A method for producing a composite plated product as set forth in claim 1 , wherein said carbon particles are scale-shaped graphite particles having an average particle diameter of 1 to 15 μm.

6. A method for producing a composite plated product as set forth in claim 1 , wherein said base material is made of copper or a copper alloy.

7. A method for producing a composite plated product as set forth in claim 1 , which further comprises a step of forming a nickel plating film on said base material before the step of forming said coating film of said composite material.

Assignees

• Dowa Metaltech Co Ltd

Inventors

• Ito Tsuyoshi
• Sonoda Yuta
• Kato Yukiya
• Narieda Hiroto

Classifications

• C25D5/605

  Surface topography of the layers, e.g. rough, dendritic or nodular layers · CPC title

• C01B32/21

  After-treatment · CPC title

• C01B32/23

  Oxidation · CPC title

• C25D15/00 Primary

  Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires · CPC title

• C25D5/12

  at least one layer being of nickel or chromium · CPC title