Silver-plated product and method for producing same

Patent metadata

Field	Value
Publication number	US-10501858-B2
Application number	US-201615542946-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	Jan 30, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A silver-plated product is produced by forming a surface layer of silver on a base material by electroplating at a liquid temperature of 10 to 35° C. and a current density of 3 to 15 A/dm 2 in a silver plating solution so as to satisfy (32.6x−300)≤y≤(32.6x+200) assuming that a product of a concentration of potassium cyanide in the silver plating solution and a current density is y (g·A/L·dm 2 ) and that a liquid temperature of the silver plating solution is x (° C.), the silver plating solution containing 80 to 110 g/L of silver, 70 to 160 g/L of potassium cyanide and 55 to 70 mg/L of selenium.

First claim

The invention claimed is:

1. A silver-plated product comprising:
a base material; and
a surface layer of silver which is formed on the base material and which has a purity of Ag of not less than 99.9% by weight,
wherein the silver-plated product has a reflection density of not less than 0.3, and
wherein the silver-plated product has a Vickers hardness Hv of not less than 110 after heating the silver-plated product at 50° C. for 168 hours as a heat-proof test.

2. A silver-plated product as set forth in claim 1 , wherein said base material is made of copper or a copper alloy.

3. A contact or terminal part which is made of a silver-plated product as set forth in claim 1 .

4. A contact or terminal part which is made of a silver-plated product as set forth in claim 2 .

5. A silver-plated product comprising:
a base material;
an underlying layer of nickel formed on the base material; and
a surface layer of silver which is formed on the underlying layer and which has a purity of Ag of not less than 99.9% by weight,
wherein the silver-plated product has a reflection density of not less than 0.3, and
wherein the silver-plated product has a Vickers hardness Hv of not less than 110 after heating the silver-plated product at 50° C. for 168 hours as a heat-proof test.

6. A contact or terminal part which is made of a silver-plated product as set forth in claim 5 .

Assignees

• Dowa Metaltech Co Ltd

Inventors

• Sadamori Shunki
• Miyazawa Hiroshi
• Ogata Masafumi
• Shinohara Keisuke

Classifications

• H01H2011/046

  by plating · CPC title

• C25D3/12

  of nickel or cobalt · CPC title

• C25D5/12

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

• Y10T428/12896

  Ag-base component · CPC title

• B32B15/018

  one layer being formed of a noble metal or a noble metal alloy · CPC title